IPv6 DHCP request floods NET

I have a problems with my HP office jet 8500 all in one printer, whenever I turn it on it floods the lan with DHCP Ipv6 query. He is relentless. I would like to disable ipv6 on the printer, but have not yet found in the menus. I have the same problem on a wireless or wired connection.

Here's a copy of the trace. any ideas?

Hi Bwrogers,

Try this link.

http://support.HP.com/us-en/document/c01554589

Thank you.

Tags: Notebooks

Similar Questions

Invalid field of SEC (seconds) on the DHCP requests sent by 9 X 2

Hi all

When I plug the phone to the switch (CISCO SGE2010P poe) the phone starts up, but when sends the FIRST dhcp request, it has a value of 29 seconds, so switch relay makes the backup DHCP server and get all the backup information when main is living.

As can be read on the manual switch:

"DHCP requests are relayed only if their DRY field is greater than or equal to the threshold value". SPA962 with SPA942, it is always true. The initial time (used to subtract) should be network time and no start.

Thank you

I solved this problem:

The phone was right, the problem is to have activated Spannin tree on the switch, because it will not be before up to 30 seconds broadcast packets to get the link.

Thank you

WES610N has not managed a DHCP requests of beneficiaries to E3000?

I can not get my WES610N to transmit DHCP requests via wireless to my E3000 router.

If I connect physically E3000-> WES610N-> laptop, it'll pass the DHCP request and get network access to the laptop.

As soon as I use the WAP as provided for in my media center with Wireless between E3000-> WES610N a wired connection between WES610N-> mobile/XBOX/PS3 none of the DHCP requests are passed along, and no access to the network is provided. The wireless signal remains strong to WAP, and I show the client wireless and assigned address DHCP at the end of the router.

I am running the latest firmware to factory on the E3000 (tried DD - WRT with no luck). Wireless security is WPA2-Personal with AES and a MAC filter to allow only a list of wireless clients. Run auto-channel and connected to the 5 GHz signal. I even tried to add MAC addresses to filter for customers physically connected to WAP with no luck.

Is there something I'm missing here, or is this a common problem?

Thanks in advance for any help!

Of course, it was something simple that fixed... I had checked the firmware on the router was in effect, but for some reason any it never came to mind to check the firmware on the bridge itself.

I received a chat session with the help of Cisco and they gave me the link for the updated for the WES610N and the WET610N firmware. After a re-flash all my current configurations for network addresses, authentication and appointing remain - so all I had to do was to remove the wired connection to router at the bridge (which was required to connect and perform the flash) and give it a try.

Initially, with the bridge still sitting next to the router it would drop and re - connect about every 20 seconds, an improvement, but still not acceptable. As soon as I moved it 10 + feet away from the router (as shown) the connection remained strong and is more randomly disconnected. The final resting place has been to my media center, which is about 30 feet more far laterally and down a level in my house.

After flash it now connects quickly, successfully passes DHCP queries on multiple devices, successfully conducts tests of speed/transfer and does not abandon the connection only once during a few hours of play. The speeds are always disappointing, maxing out at about 70 MB/s on wirelessN - but that's a lot for streaming media and ~ 2 x more than my cable internet service can pull down.

Anyway, here is the link to the firmware if you are still with me after this long explanation:

http://homedownloads.Cisco.com/downloads/firmware/1224668058222/FW_WES610N_WET610N_1.0.05.004_201108...

SNMP and DHCP requests on collector

Hello world

I want to see the SNMP and DHCP requests on the interface of collector.

How can I see these queries?

Y at - it logs through which we can see or some CLI to run on systems CASE.

Please help me on this and suggest.

Thank you

Abuzar

Hello

a newspaper would be quickly filled if she provided details on all packages.

The easiest way is to run a tcpdump on the collector.

tcpdump for example eth0-i

You can use tcpdump - help for more info.

Hope this helps,

Nicolas

===

Please note the answers that will help you

Incorrect host name length ASA DHCP Request

I have an ASA 5505 with software version 8.2 (1). It deploys DHCP requests to the clients that connect to the ASA IPSec. The DHCP protocol please packages that the ASA did have a '00' extra added to the hostname field, and the length field is the size of the hostname + 1.

The DHCP server is a Microsoft Server 2003 and this causes the host name be registered with an unknown character who is listed under the hostname []. Then, when server 2003 tries to update the DNS record, it fails because of the invalid character in the host name.

Is anyway to have the ASA have the right length for the host in the DHCP package name field or a workaround that will solve this problem?

Hi Mark,

That's exactly the problem described in, here's a copy of the bug release notes:

Symptom:
When VPN Clients connect to the ASA the ASA inserts an extra character or carriage return in the DHCP scope which causes the users' application to display dhcp information on two lines as opposed to one; the extra character causes a line feed on address resolution and automated tools can't handle the result.
This is also noticed as an extra symbol that looks like a box/carriage return added to the "Name" Field within the Windows 2003 Server > DHCP > Scope > Address Leases.
Conditions:
ASA using Windows 2003 Server as external DHCP Server.

VPN Clients update DNS using DHCP protocol through ASA to external Windows 2003 DHCP server.

ASA has "dhcp-client update dns" or "dhcp-client update dns server none" configured.
Workaround:
Don't update DNS through DHCP to an external server, i.e. configure "no dhcp-client update dns".
Further Problem Description:
The ASA sends the DHCP server a packet with malformed DHCP option 81 (Client Fully Qualified Domain Name) which causes the Windows 2003 Server to add a character to the 'Name' field in the DHCP Scope Address Leases seen on the Server.  This character looks to be a carriage return.




You have 'dhcp-client update dns' configured on your ASA?
If so, could you delete and see if the ASA always sends option 81?
Kind regards
Nicolas

IPv6, dhcp with a standalone server

Hi all!

I'm trying to set up a network of small size with a cisco 3750 G. I've got 3 VLANS, two for the client subnets and the other for my dhcp server on windows 2008 r2. I want to use my windows server dhcp server dedicated. I need to assign to all ipv6 addresses my VLAN and tried to activate ipv6, ipv6 unicast routing and agents of relay but I cannot get my to my clients dhcp server leases. Someone at - it an idea on how to solve this problem?

MrJanolov, Sweden

Hello

You want your customers to get ipv6 using DHCP and not addresses via SLAAC configuration? If yes you can remove RA on the interface oriented to the customer with the order to remove ipv6 nd ra or use the ipv6 nd managed-config command to tell clients to use DHCPv6 and not SLAAC.

Kind regards.

Alain.

Frequency of the Apple TV DHCP

I see my Wired Apple TV 4 DHCP requests every minute. This doesn't seem fair.

Hello. This seems to be a problem for a long time with the ATV ethernet interface, see AppleTV 3 floods DHCP when connected ethernet. I found myself with 4 ATV. My guess is that this may be due the router to 0 lease issue, which should be interpreted as 24 hours. Please add your report to Apple here https://www.apple.com/feedback/appletv.html.

SGE2010 - traffic relay and DHCP configuration

Hei

We bought just a switch SGE2010 we want to use to replace the switches in the control panel of our office. So far I managed to access the switch and assigned a static ip.adress on our net, but I can't get to our entry point switch relay traffic. I have a test machine that is configured with a static IP as well and tried the ok sign, but as soon as I put the switch between traffic is not relayed.

The idea was to use this switch as a DHCP as well. But I thought it would be a start to get at least the traffic relayed before starting the dhcp part.

Only configuration settings I have done factory settings are the following: (note that the IP is slightly adjusted, but consistent for reasons of confidentiality)

Configuration of the IP4
1. Assigned to a static ip address: 95.59.69.148
2. Assigned a subpattern: 255.255.255.192
3. Assigned to a user-defined gateway: 95.59.69.129
DNS configuration
1. Assigned to an ip address dns address: active 95.59.0.100
2. Assigned to a dns ip address: 95.59.0.200
All these settings are the default settings that we use when we assign a server with a static ip address, so it is not a pick up of our filtration dhcp server. So my main question is why on earth isn't it relay traffic?

In addition, we are interested to kill the former (with stones, I hope) dhcp server and dhcp on the sge2010 configuration. The current dhcp is an operating system. X dhcp server (Yes a mac) with the following configuration:
- (Dynamic ip) subnet
  From ip: 95.59.69.179
  Ending ip: 95.59.69.190
  Subnet: 255.255.255.192
- Router ip: 95.59.69.129
  Rental time: 3 hours
- The range 95.59.69.130 to 95.59.69.149 we set up manually on the servers, hardware, etc.
- DNS server: 95.59.0.100 & 95.59.0.200
  Default search domain: No. - dns - available.example.com
- And then we have a group of static mappings to Mac-addresses
  ip address: 95.59.69.150
  IP: 95.59.69.178
I tried to see in the configuration where I could the mappings static spesify range etc, but I can't say it got me anywhere. So my second question is how to install a server dhcp of Eric as a designated above?

It's nice to finally convince the CEO to move the dhcp to a better metal, but it's not as nice having a hard time setting up. I would apprecitate every possible leeds and suggestions since I'm kinda stuck.

Thanks in advance

Rafn.R

Hello

My SGE2000P forwards DHCP requests on my DHCP server.

I used my default VLAN1 as an interface routed to unicast request DHCP relay on my server (router ISR UC520) that resides on that VLAN 1.

My interface Vlan 1 on my SGE2000P has an IP 192.168.10.254.

My gateway address for potential hosts in VLAN 2 IP will be the ADDRESS IP I AI ASSIGNES to VLAN 2, because the PC or the IP hosts connected to VLAN2 will use IP VLAN2 interface as the gateway. It's just how it works!

Hosts of PC on VLAN 2 need of a default route and they use the IP I assigned to VLAN2 as their next jump out VLAN2 on the real world.

This address can be seen below.

DHCP relay is enabled with the option 82

I chose VLAN2 as an interface VLAN, as shown below.

I have two ports not signposted in the VLAN2, and I joined an IP host to G1 so that I can test the DHCP relay.

I get the following debug output from my dhcp server, so I know the relay is working.

002624: 19:40:08.575 Dec 5: DHCPD: looking for expiry of the leases.

002625: 19:40:58.408 Dec 5: DHCPD: DISCOVER notification to:

002626: 19:40:58.408 Dec 5: DHCPD: htype 1 CHADRR 0025.84d8.d008

002627: 19:40:58.408 Dec 5: DHCPD: id remote 020a0000c0a80a0101080001

002628: 19:40:58.408 Dec 5: DHCPD: id circuit 00000000

002629: 19:40:58.408 Dec 5: DHCPD: see if there is a specified internal pool class:

But I must confess that I have opened a case on it with the Small Business Support Center, because I think I can see something wrong on my DHCP server debugging.

But the key is that I see the router WAN/DHCP server, see the query from DHCP.

The only way to the broadcast DHCP requests can get to the DHCP server, if the switch SGE2000P takes these DHCP broadcast requests and unicast these or relay to my server DHCP IP address 192.168.10.1.

So in other words he tries to relay DHCP.

I would ask you to please check the SGE2010 Administrator's guide because it clearly shows how to configure the DHCP on the SGE2010 relay.

Even if the screen capture shows and the old version of the code below. I have day my SGE2000P tonight at the generally available (GA) version of the code.

Just outa interest, if you telnet to the switch, is your mode of layer 3 or Layer 2 switch.

I can also say from your screenshot that your uplink ports are in overlay mode.

Maybe if you don't use stacking, you can set your switch to the layer 3 mode and standalone mode

Best regards, Dave

DHCP with VPN

I work with an ASA 5505. I configured a connection IPsec remote access profile. This profile is set to give customers a virtual ip address via DHCP as shown in this example configuration:

http://www.Cisco.com/en/us/products/ps6120/products_configuration_example09186a0080a66bc6.shtml

When the DHCP request is sent from the ASA to the DHCP server, the hostname in the query is set to the name of the IPsec connection profile and a number. Is it possible to have the host name, set the host name of the client who initiated the connection?

The ASA takes by receiving a host name in a request for Config Mode IKE?

Thank you

Mark

Aug 11 07:06:27 [IKEv1 DEBUG]: Group = IPSEC-Test, Username = cisco, IP = 20.20.20.1, MODE_CFG: Received request for IPV4 address!

    Aug 11 07:06:27 [IKEv1 DEBUG]: Group = IPSEC-Test, Username = cisco, IP = 20.20.20.1, MODE_CFG: Received request for IPV4 net mask!

    Aug 11 07:06:27 [IKEv1 DEBUG]: Group = IPSEC-Test, Username = cisco, IP = 20.20.20.1, MODE_CFG: Received request for DNS server address!

    Aug 11 07:06:27 [IKEv1 DEBUG]: Group = IPSEC-Test, Username = cisco, IP = 20.20.20.1, MODE_CFG: Received request for WINS server address!

    Aug 11 07:06:27 [IKEv1]: Group = IPSEC-Test, Username = cisco, IP = 20.20.20.1, Received unsupported transaction mode attribute: 5

    Aug 11 07:06:27 [IKEv1 DEBUG]: Group = IPSEC-Test, Username = cisco, IP = 20.20.20.1, MODE_CFG: Received request for Banner!

    Aug 11 07:06:27 [IKEv1 DEBUG]: Group = IPSEC-Test, Username = cisco, IP = 20.20.20.1, MODE_CFG: Received request for Save PW setting!

    Aug 11 07:06:27 [IKEv1 DEBUG]: Group = IPSEC-Test, Username = cisco, IP = 20.20.20.1, MODE_CFG: Received request for Default Domain Name!

    Aug 11 07:06:27 [IKEv1 DEBUG]: Group = IPSEC-Test, Username = cisco, IP = 20.20.20.1, MODE_CFG: Received request for Split Tunnel List!

    Aug 11 07:06:27 [IKEv1 DEBUG]: Group = IPSEC-Test, Username = cisco, IP = 20.20.20.1, MODE_CFG: Received request for Split DNS!

    Aug 11 07:06:27 [IKEv1 DEBUG]: Group = IPSEC-Test, Username = cisco, IP = 20.20.20.1, MODE_CFG: Received request for PFS setting!

    Aug 11 07:06:27 [IKEv1 DEBUG]: Group = IPSEC-Test, Username = cisco, IP = 20.20.20.1, MODE_CFG: Received request for Client Browser Proxy Setting!

    Aug 11 07:06:27 [IKEv1 DEBUG]: Group = IPSEC-Test, Username = cisco, IP = 20.20.20.1, MODE_CFG: Received request for backup ip-sec peer list!

    Aug 11 07:06:27 [IKEv1 DEBUG]: Group = IPSEC-Test, Username = cisco, IP = 20.20.20.1, MODE_CFG: Received request for Client Smartcard Removal Disconnect Setting!

    Aug 11 07:06:27 [IKEv1 DEBUG]: Group = IPSEC-Test, Username = cisco, IP = 20.20.20.1, MODE_CFG: Received request for Application Version!

    Aug 11 07:06:27 [IKEv1]: Group = IPSEC-Test, Username = cisco, IP = 20.20.20.1, Client Type: WinNT  Client Application Version: 5.0.05.0290

    Aug 11 07:06:27 [IKEv1 DEBUG]: Group = IPSEC-Test, Username = cisco, IP = 20.20.20.1, MODE_CFG: Received request for FWTYPE!

    Aug 11 07:06:27 [IKEv1 DEBUG]: Group = IPSEC-Test, Username = cisco, IP = 20.20.20.1, MODE_CFG: Received request for DHCP hostname for DDNS is: PD1-STATIC-WXP!

    Aug 11 07:06:27 [IKEv1 DEBUG]: Group = IPSEC-Test, Username = cisco, IP = 20.20.20.1, Obtained IP addr (192.168.1.4) prior to initiating Mode Cfg (XAuth enabled)

    Aug 11 07:06:27 [IKEv1 DEBUG]: Group = IPSEC-Test, Username = cisco, IP = 20.20.20.1, Sending subnet mask (255.255.255.0) to remote client

    Aug 11 07:06:27 [IKEv1]: Group = IPSEC-Test, Username = cisco, IP = 20.20.20.1, Assigned private IP address 192.168.1.4 to remote user

    Aug 11 07:06:27 [IKEv1 DEBUG]: Group = IPSEC-Test, Username = cisco, IP = 20.20.20.1, constructing blank hash payload

    Aug 11 07:06:27 [IKEv1 DEBUG]: Group = IPSEC-Test, Username = cisco, IP = 20.20.20.1, Send Client Browser Proxy Attributes!

    Aug 11 07:06:27 [IKEv1 DEBUG]: Group = IPSEC-Test, Username = cisco, IP = 20.20.20.1, Browser Proxy set to No-Modify. Browser Proxy data will NOT be included in the mode-cfg reply

    Aug 11 07:06:27 [IKEv1 DEBUG]: Group = IPSEC-Test, Username = cisco, IP = 20.20.20.1, Send Cisco Smartcard Removal Disconnect enable!!

    Aug 11 07:06:27 [IKEv1 DEBUG]: Group = IPSEC-Test, Username = cisco, IP = 20.20.20.1, constructing qm hash payload

    Aug 11 07:06:27 [IKEv1]: IP = 20.20.20.1, IKE_DECODE SENDING Message (msgid=fa774da7) with payloads : HDR + HASH (8) + ATTR (14) + NONE (0) total length : 206

Version above. The Tunnel-Group and the host name. Also make sure you have "Register this connection in DNS" setting checked under Advanced properties of WILL. It comes default Cisco VPN client. If StrongSwan has one GOES then it must follow the rules in the Windows API, this parameter expected to be here than if she one WILL, in the case where it is a sort of driver setup miniport (shim), she has no one will

Here is the package:

Frame 9 (590 bytes on wire, 590 bytes captured)

    Ethernet II, Src: Cisco_d7:74:dd (00:25:45:d7:74:dd), Dst: Vmware_ad:75:1b (00:50:56:ad:75:1b)

    Internet Protocol, Src: 11.12.12.5 (11.12.12.5), Dst: 11.12.12.25 (11.12.12.25)

    User Datagram Protocol, Src Port: bootps (67), Dst Port: bootps (67)

    Bootstrap Protocol

        Message type: Boot Request (1)

        Hardware type: Ethernet

        Hardware address length: 6

        Hops: 0

        Transaction ID: 0x011b5678

        Seconds elapsed: 7

        Bootp flags: 0x0000 (Unicast)

            0... .... .... .... = Broadcast flag: Unicast

            .000 0000 0000 0000 = Reserved flags: 0x0000

        Client IP address: 0.0.0.0 (0.0.0.0)

        Your (client) IP address: 0.0.0.0 (0.0.0.0)

        Next server IP address: 0.0.0.0 (0.0.0.0)

        Relay agent IP address: 11.12.12.5 (11.12.12.5)

        Client MAC address: Cisco_d7:74:dd (00:25:45:d7:74:dd)

        Client hardware address padding: 00000000000000000000

        Server host name not given

        Boot file name not given

        Magic cookie: (OK)

        Option: (t=53,l=1) DHCP Message Type = DHCP Discover

            Option: (53) DHCP Message Type

            Length: 1

            Value: 01

        Option: (t=57,l=2) Maximum DHCP Message Size = 1152

            Option: (57) Maximum DHCP Message Size

            Length: 2

            Value: 0480

        Option: (t=61,l=45) Client identifier

            Option: (61) Client identifier

            Length: 45

            Value: 00636973636F2D303032352E343564372E373464642D5044...

        Option: (t=12,l=15) Host Name = "PD1-STATIC-WXP"

            Option: (12) Host Name

            Length: 15

            Value: 5044312D5354415449432D57585000

        Option: (t=55,l=6) Parameter Request List

            Option: (55) Parameter Request List

            Length: 6

            Value: 01060F2C0321

            1 = Subnet Mask

            6 = Domain Name Server

            15 = Domain Name

            44 = NetBIOS over TCP/IP Name Server

            3 = Router

            33 = Static Route

        End Option

        Padding

The only thing that is new is the 'register this connection in DNS' thing you can find in the Advanced AV. properties

2911 w/security - VPN with DHCP Relay to Win2K8, routing fail

Hello

I have a 2911 router and tries to terminate a VPN inside.

I want to do this is before the DHCP request to a Server 2008 inside.

I actually received this part to work. But it seems to be, 2911 router is not set the VPN clients on a VLAN internal associated with the range of network, the DHCP server is to give. Or all least, does not have a flow of information between the IP address of the VPN Client and the router itself.

(washed config below)

Example: VPN Client obtains the IP address of 10.101.55.10. The router has a loop (or subinterface in my last iteration of the config) address of 10.101.55.1.

And yet, when my VPN client connects, I am not able to ping to an IP that my router has. I can ping myself (10.101.55.10), but I only ping the router in any way which.

Does anyone have any ideas?

-----

Paste config

-----

!
! Last configuration change at 04:48:18 UTC Friday 25 March 2011 by x
!
version 15.0
horodateurs service debug datetime msec
Log service timestamps datetime msec
encryption password service
!
host name x
!
boot-start-marker
boot-end-marker
!
logging buffered 51200 warnings
enable secret 5 x
!
AAA new-model
!
!
AAA authentication login default local radius group
AAA authentication login userauthen local
AAA authorization groupauthor LAN
!
!
!
!
!
AAA - the id of the joint session
!
!
!
!
No ipv6 cef
IP source-route
IP cef
!
!
!
!
property intellectual name x
!
Authenticated MultiLink bundle-name Panel
!
!
!
Crypto pki trustpoint TP-self-signed-3088527431
enrollment selfsigned
name of the object cn = IOS - Self - signed - certificate - 3088527431
revocation checking no
rsakeypair TP-self-signed-3088527431
!
!
TP-self-signed-3088527431 crypto pki certificate chain
certificate self-signed 01
3082024B 308201B 4 A0030201 02020101 300 D 0609 2A 864886 F70D0101 04050030
2 060355 04031326 494F532D 53656 C 66 2 AND 536967 6E65642D 43657274 31312F30
69666963 33303838 35323734 6174652D 3331301E 31393532 OF 30323236 170 3131
31375A 17 0D 323030 31303130 30303030 305A 3031 06035504 03132649 312F302D
4F532D53 5369676E 656C662D 43 65727469 66696361 74652 33 30383835 65642D
32373433 3130819F 300 D 0609 2A 864886 01050003, 818, 0030, 81890281 F70D0101
8100BB8B DCF74C9C 5068AF8B 17458225 C2C3702C 416CE391 6EA8991B D3CFFA1A
62FCA661 566A30C5 2ADE1CBF 558335F9 E9811663 819FA2E9 BEEC77CD 768A 5829
437E90FA 17F50DDE 94B52B67 96E1E8FC E4E7A12C 07E67582 342774 5 DF956CC8
FAB6BA34 AB2D79B0 771D8D88 40FDDC34 9F5A0145 4A18B252 037DCDE1 8A114B84
010001A 3 73307130 1 130101 FF040530 030101FF 301E0603 0F060355 0F190203
551 1104 17301582 1341434 C 50475231 74657374 2E636F6D 301F0603 2E61636C
551 2304 18301680 14929613 69D7A350 EA595EC1 C1520246 C00CAB37 A2301D06
04160414 92961369 D7A350EA 595EC1C1 520246C 03551D0E 0 0CAB37A2 300 D 0609
2A 864886 04050003 81810077 CBE5CA04 9D75B036 CF639BEC EFD03A3C F70D0101
FB1390E6 5DC1DBF9 7311123D 9A 018140 2509EADC 9F03747E 3D12F993 BB69D424
AEA4E0A6 75AF5209 4BD15BE0 92BDA0F1 C74245AF C41DB154 E443F8AD 3605EBE3
F293D601 10 C 07520 FCB38B3E 6AC9AE74 AE9CB2A2 A80CED34 1FE185CF 24B1A689
A9E1CF15 F3041A8E CE12C914 C53EEA
quit smoking
udi pid CISCO2911/K9 sn x license
!
!
VTP version 2
user name x
!
redundancy
!
!
property intellectual ssh time 60
property intellectual ssh version 2
!
!
crypto ISAKMP policy 3
BA 3des
preshared authentication
Group 2
!
crypto ISAKMP policy 5
preshared authentication
Group 2
ISAKMP crypto key address 0.0.0.0 dmvpnkey 0.0.0.0
ISAKMP crypto nat keepalive 20
!
the group x crypto isakmp client configuration
x key
DNS 10.0.0.6 10.0.0.3
area x
10.3.0.3 DHCP server
GIADDR DHCP 10.101.55.1
netmask 255.255.255.0
!
!
Crypto ipsec transform-set esp-3des esp-sha-hmac VPNSET
Crypto ipsec transform-set esp-3des esp-sha-hmac dmvpnset
!
Crypto ipsec profile dmvpnprof
Set transform-set dmvpnset
!
!
dynamic-map crypto vpn-dynmap 10
game of transformation-VPNSET
!
!
customer vpnclientmap of authentication crypto map list vpnusers
card crypto isakmp authorization list groupauthor vpnclientmap
client configuration address card crypto vpnclientmap answer
vpnclientmap 10 card crypto-isakmp ipsec vpn Dynamics-dynmap
!
!
!
!
!

!
!
interface GigabitEthernet0/0
Telus MPLS description
IP 10.101.2.1 255.255.255.252
IP virtual-reassembly
Shutdown
automatic duplex
automatic speed
!
!
interface GigabitEthernet0/1
AllNorth hand VPN description
DHCP IP address
NAT outside IP
IP virtual-reassembly
automatic duplex
automatic speed
vpnclientmap card crypto
!
!
interface GigabitEthernet0/2
Description main trunk to LAN internal
no ip address
automatic duplex
automatic speed
!
!
interface GigabitEthernet0/2.4
encapsulation dot1Q 4
IP 10.101.4.1 255.255.255.0
IP helper 10.3.0.3
IP nat inside
IP virtual-reassembly
!
interface GigabitEthernet0/2.10
encapsulation dot1Q 10
IP 10.101.10.1 255.255.255.0
!
interface GigabitEthernet0/2.50
encapsulation dot1Q 50
IP 10.101.50.1 255.255.255.0
!
interface GigabitEthernet0/2.55
encapsulation dot1Q 55
IP 10.101.55.1 255.255.255.0
!
interface GigabitEthernet0/2.99
encapsulation dot1Q 99
IP 10.101.99.1 255.255.255.0
!
interface FastEthernet0/0/0
switchport access vlan 4
!
!
interface FastEthernet0/0/1
!
!
interface FastEthernet0/0/2
switchport access vlan 10
!
!
interface FastEthernet0/0/3
switchport mode trunk
!
!
interface Vlan1
no ip address
!
!
!
Router eigrp 1
Network 10.250.1.2 0.0.0.0
!
router ospf 100
Log-adjacency-changes
0.0.0.0 network 10.101.2.2 area 0
!
VPN IP local pool 10.151.56.1 10.151.56.20
IP forward-Protocol ND
!
no ip address of the http server
no ip http secure server
!
IP nat inside source nat route map - this interface GigabitEthernet0/1 overload
IP route 10.3.0.0 255.255.255.0 10.101.4.2
!
allowed to access-list 23 x
access-list 23 allow 10.0.0.0 0.255.255.255
access-list 100 permit udp any host x eq isakmp
access-list 100 permit esp any host x
access-list 100 permit gre any x host
access-list 100 permit tcp any host x eq telnet
access-list 104. allow ip 10.101.4.0 0.0.0.255 any
access-list 104. allow ip 10.101.55.0 0.0.0.255 any
access-list 130 allow ip 10.0.0.0 0.255.255.255 10.101.55.0 0.0.0.255
!
!
!
!
nat permit - this route map 10
corresponds to the IP 104
!
!
x SNMP-server community
!
control plan
!
!
!
Line con 0
line to 0
line vty 0 4
access-class 23 in
Synchronous recording
transport input telnet ssh
line vty 5 15
access-class 23 in
transport input telnet ssh
!
Scheduler allocate 20000 1000
end

Yes, it looks like you might have as a subnet of more large covered in your routing protocols internal hence set up 'reverse-road '.

Good to hear it works now. Kindly, please mark this post as responded while others can learn from this post. Thank you.

Can DHCP server with two scopes - I have reservations in doubles in the two staves?

Hi all

Not really a guru of DHCP, so be nice :)

Currently, we run a DHCP service from one of our domain controllers (win 2008R2). The domain controller is the segment of a network (10.10.120.0/24), the computers making DHCP requests are on a separate network (10.10.103.0/22). We use our ip-helper routers setting to say the devices on the network, how to reach the DHCP server. This has worked well for years. I should also point out it is company policy for PCs/servers have a static IP, so for the PC, we create reservations for each PC. Servers are assigned static mmanually.

The question is now we have overflowed into a new building and put in a black 1 GB fiber that connects the two buildings. The network in the new building is using a different network (10.10.104.0/24) address. Implementation of a 2nd scope on the DHCP server for this address range went well and once the ip-to support additional parameter has been done on the router the PCs in the new building could fine DHCP to the domain controller in the main building. Everything is good.

The question is now, we are moving PC between the two buildings, I was wondering if it is ok to keep the existing reserves for the PC in one scope and have a duplicate for her in the new scope assign the new IP address. Of course, the PC cannot be in two places at once and the DHCP console doesn't; "t seem to complain about the same MAC address used in two staves, but I don't really know whether it is advisable or not. Basically, our operations staff become a little miffed at having to remove a single scope of reservations and recreate them in the 2nd scope when the PC to move between buildings.

So the questions is safe / advisable to do it or not?

Kind regards

Craig

Support is located in the Windows Server Forums:
http://social.technet.Microsoft.com/forums/en-us/category/WindowsServer/

Question of DHCP Option 50

I understand that the DHCP 50 option is for the customer asked the IP address.

I have 3 questions about this...

1. the DHCP server on the router maintains the MAC--> IP mapping during 24 hours right?

What happens if I ask a non assigned a different IP address in the 24 hour window? My request will be granted each time?

What happens if I ask for an IP address not assigned different after the 24 hour window? I guess that my request will be granted every time in this case.

2. always in the window of 24 hours, if the requested IP address is leased to another network device, but the device has long been disconnected,

I get the requested IP address?

2 do all versions of routers support this option?

Depends on the implementation of the DHCP server. The RFC does not say how to handle 50 option. The DHCP server can but should not affect the requested IP address. It can completely ignore this option.

So:

How long the server retains the mapping? Depends on the server. It may or may not remove the mapping after the lease has expired (which I assume is the 24 hours, that you reference).

Ask a different IP address during the valid lease? Depends on the server. The server may grant each time. Another server can refuse each time.

I think it is more common to not to grant the request. Internally the DHCP server manages static IP mappings and pool all the same except the static IP mapping has an unlimited lease duration. As long as a request from a computer comes that already has a mapping (static or pool) he always attributes known IP address and the other does not.

After the expiry of the lease? Depends on the server. A DHCP server keep the maps even after the expiry of the lease. The simple purpose of this is that if you have a fairly large pool that gets not exhausted you basically assignments to static IP addresses to DHCP clients. Even if a client releases the lease (because the computer is stopped) or the lease expires, he will always keep this information. Next time (for example, you turn on the computer after the weekend) it will always go to the same IP. But again, it is up to the implementation of the server. Other servers follow other policies and do differently.

Address IP lease request? N ° never. The DHCP server must not assign an IP address that has been rented elsewhere. There is no reliable way to make sure that the DHCP server as other devices is indeed off. If a unit is stopped, it must release the DHCP lease. If it is not the case, the IP address is blocked until the lease expired. The only case that a transfer could occur is if the DHCP server has been reset and lost its DHCP lease table. In this case, the DHCP server does not know before granted leases.

Supported? All DHCP servers must be able to receive DHCP requests include this option. It is the implementation of the DHCP server if the DHCP option is really accepted or not. Some servers may completely ignore this option.

Protocol DHCP on WRT54G

It's a mystery to me how the DHCP server works on my WRT54G. If someone can explain how it works with Windows, while not following RFC 2131 I'll be indebted to.

I connect a system with a proprietary OS using a wired connection. When the computer emits a package DHCP DISCOVER the router never responds. The router is an ARP for a new address and then adds the address in its routing table using the hostname of my computer! Even my system now for this a DHCP REQUEST using that new address of the router still lies silent. Absolutely not, it meets all DHCP requests.

When I use Microsoft Netmonitor, I send all packages are correct. If I look at a box XP get an address through DHCP, I see the same behavior. The router never answers but see Windows of the ARP by the router and guess that's there address and 3 gratuitous ARP before start using it.

I am completely baffled by this non-standard behavior. Is there a way to get this router to follow together the Protocol as specified in the standard - including - DISCOVER, OFFER, REQUEST, ACK?

I tried Wireshark on my Linux box connected via a cable incase the problem was with Netmonitor on an XP laptop wireless as you suggest.

This time, when I booted the XP box, I saw the acknowledgement of receipt of the REQUEST. After a closer examination of the BOOTP header, I noticed the SHOW was set in the flags. I decided to put it in my package DISCOVER and it works according to the specification now!

I thought that the use of this flag has been deprecated, but alas, I discovered a router he needs. Thank you for your help and for me to get on the road to the use of Wireshark.

Kind regards

Bill

Pwerconnect 6224: vlan client computers do not receive the ip address of DHCP server on a different VLAN

Hello

I have a prolem routing dhcp requests between the vlan management where DHCP server resides and the other VLANs.

I have the scenario of base with three VLANS: vlan 10 (management vlan), 20, 30, configured on a Powerconnect 6224 switch L2 mode. This switch is connected to a pfsense router. The router is configured at the package of road between the VLANS and it does it well.

In Vlan 10, I have a configured DHCP server to use the ip addresses of all the VLANS (10, 20, 30). VLAN 10 client computers receive ip address but not others from other VLANs.

When I put the ip address in the appropriate range of VLANs manually on computers, I ping the server and I have connectivity.

This suggests that the problem is with the dhcp package.

The following is the configuration of the switch:

Configure
database of VLAN
VLAN 10,20,30
VLAN 1 1 routing
VLAN 20 2 routing
VLAN 30 3 routing
output
SNTP server time.nist.gov
clock timezone 1 minutes 0
battery
1 1 member
2 2 Member
output
DHCP IP address
IP address vlan 10
name of the IP-server 172.16.10.1

bootpdhcprelay cidridoptmode
interface vlan 1
Routing
IP 172.16.1.1 255.255.255.0
output
interface vlan 20
Routing
address 172.16.20.1 IP 255.255.255.0
output
interface vlan 30
Routing
IP 172.16.30.1 255.255.255.0
output
level of 20fc49459a1898b923ed3ec7b3e81276 user name 'admin' password encrypted 15
No spanning tree
spanning tree priority 0
l2relay DHCP
DHCP l2relay VLANs 10, 20-30
DHCP l2relay circuit-id VLANs 10, 20-30
!
interface ethernet 1/g2

l2relay DHCP
switchport access vlan 20
output
!
interface ethernet 1/g3
l2relay DHCP
switchport access vlan 30
output
!
interface ethernet 1/g21
switchport access vlan 10
output
!
interface ethernet 1/g22
switchport access vlan 10
output
!
interface ethernet 1/g23
switchport access vlan 10
output
!

interface ethernet 1/g24
switchport mode trunk
switchport trunk allowed vlan add 10,20,30
output
Server SNMP community EyesOfNetwork ro
SNMP-server community public ro
output

I followed the instructions in the powerconnect 6224 user guide, but no progress on this issue.

Any help will be be grateful.

Thank you

Zoubeir

The DHCP server stores information that could be useful? May need to configure monitoring ports and something as wireshark to monitor DHCP packets. This would help determine where the package is stopping.

example:

Console (config) #monitor session 1 source interface 1/g8

Console (config) #monitor session 1 destination interface 1/g10

session mode 1 #monitor console (config)

right now I don't see anything in the config of the switch that stands out. If the DHCP server is configured for option 82, then you will need to include the following command on the switch.

Example:

Trust l2relay console #dhcp (config-if-1/g1)

But I don't think that's our scenario here.

IOA FX2 constantly asking DHCP, exhausting vlan1 with BAD_ADDRESS

I have a Win 2008 R2 (and then upgraded to 2012 R2) DHCP server which is loads BAD_ADDRESS was complete the scope to the vlan1. All other scopes for other VLANs are not affected. Wireshark has indicated a mac address dell AIO management that the switch shown on our PortChannel3 (two interfaces 10gbe fiber optics).

But in our config IOA, we have a static set of the intellectual property of 10.1.0.103/16. The DHCP server is at 10.1.1.1/16 and also intellectual property offers in other scopes (10.2.1.1/16, 10.3.1.1/16, 10.4.1.1/16 and vlan5 10.5.1.1/16 vlan4 vlan3 vlan2).

I had to put the Dell AIO mac address in the DHCP deny list of filters and turn it on so that it would not respond and plug our full of BAD_ADDRESS address space.

No idea why the IOA is dhcp requests even if we put it to a static IP address?

Okay, I think I can find something. On the config of switch, I am able to access by ssh to the MCC and issue a command to connect to the switch 1.

I see that he has this entry to see the race,

interface Vlan 1

DHCP IP address

MTU 2500

no downtime

So I conf t break-in

no ip address dhcp

Now I'm running wireshark and have not seen this mac address in my filter for bootp at all yet. They may have been the problem. What's weird, it's who knows why if it was on DHCP, that our server would not at all be because she a IP address and done with it. Who knows why each minute the IOA kept DHCP and our server kept declining and then marking it a wrong address.

Anyway I don't have an ip address on vlan1 on the IOA because did not make any L3. I also already have an IP address for the management ethernet 0/0, but I fail it anyway at his direct IP unless I port stop the e Gig chassis CMC management is well connected to our switch. So I managed by ssh to the CMC and issuance of an order of connection.

The other AIO is on his own Brocade switch isolated with its own regime of intellectual property and all that is NOT connected to our LAN. This brocade switch is simply a network storage IP for NFS on the VMS and our data backup appliance.

IPv6 DHCP request floods NET

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