VPN MTU issue
Hello
I have a router 2901, building a private network to a dynamic virtual third party peripheral. The VPN initially was hurt by the way some of the traffic. Pings worked, would not HTTP. So, I made a few captures of packets and saw that she needed to become fragmented. So I put the external interface mtu around 1380, and the VPN began to work perfectly. However, he "broke" regular web access. Now a few other sites (on the Internet/non-VPN) attended the same behavior.
My topology is very simple hand-off ISP - router 2901 - internal Ethernet switch.
What is the correct design of MTU for this scenario?
Thank you
Edit: Here is a broad generalization
Unless you need to worry about protocols large datagram twist MSS instead of MTU.
Or adjust the MTU (and MSS) on logical interfaces (tunnel or VT)
M.
Tags: Cisco Security
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Recently, I have set up a 1721 running IOS c1700-k9o3sy7 - mz.122 - 15.T5.bin
This router terminated a VPN with another router, a 1721 with the exact same version of IOS. This router has initially been connected via a WAN link on eth0 wireless. We moved their on a t1 as the main interface with the wireless as a backup. Then we had to
-Configure a loopback - its ip address device would end the vpn
-make the source of the vpn packages come from the loop
-Configure static routes w / higher administrative distance
Do all this we tested VPN - they worked. Unplugged at t1 connection and traffic moves on the wireless. We checked the vpn clients could connect. Everything worked ok...
Except when you move large files between hosts behind fa0 via the vpn to the guests at the bottom. To prove the vpn worked and routing was in place, we could telnet from a host behind fa0 via the vpn to a remote host and you connect... Then, we would try an ftp files more. We could connect to the ftp server BUT once a file transfer started things would hang.
We opened a Cisco tac case and it turned out that the addition of
IP tcp adjust-mss 1300
the interface fa0 fixed all - file transfer worked.
My question why would be reduced aid package size? The vpn add some packages generals cauing more large packages to remove?
A clue was here, BUT it's PPPoE - no VPN...
I'm looking to explain why this reduced MTU size worked. I would of never figured this out on my own...
Here's the running-config, we used. Don't forget that everything worked (switching between WAN, vpn, NAT connectivity link) except the transfer of files and when large amounts of data was pushed over the line as MS-sharing files/printers, emails with attachments (a few hundred k). The only change is a line at the fa0 interface.
version 12.2
horodateurs service debug uptime
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You can check the following site for more explanation:
http://www.Cisco.com/en/us/Tech/tk827/tk369/technologies_tech_note09186a0080093f1f.shtml
HTH...
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VPN IPSec L2L between IOS and PIX 6.3 - MTU issue?
The side of the remote control (customer) is behind the 6.3 (5) PIX. And the side of the head end (server) is 2911 IOS on 15.0.
The IPSec tunnel rises very well and passes traffic. However, there is a server which are not fully accessible. Note, it is mainly the web traffic.
Client initiates a connection to the http://server:8000. They receive a redirect to go to http://server:8000 / somepage.jspa. Package caps show the customer acknowledges the redirect with a SYN - ACK response, but then the connection just hangs. And no other packets are received in return. I noticed that the redirected page is a .jsp and other pages that work OK are not. I also noticed that some MTU and TCP MSS configurations on the side of the head that are in place for another GRE VPN tunnel with another site. So I got in the way of the fragmentation of packets. The side PIX has all the standard configurations of IPSec as well as default MTU on the interface of the inside and outside.
When the MTU is set manually on the client computer to 1400, the access to the works of http://server:8000 / somepage.jspa very well. So I need to tweak the settings of PIX. I tried to adjust the MTU size on and abroad the interface as well as the parameter "sysopt connection tcp - mss. I don't know what else to do here.
Here is a summary of the MTU settings on the head of line:
End of the head:
int tunnel0 (it's the GRE tunnel)
IP mtu 1420
source of tunnel G0/0
dest X.X.X.X
tunnel path-mtu-discovery
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tunnel GRE Description
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blah blah blah
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IP virtual-reassembly
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HA, sorry my bad. Read the previous post wrong.
(Note: Yes, the SMS on the tunnel interface should be 40 bytes less than MTU).
Do not twist the MTU, not for TCP problems (not as the first step), it is safer to play with the MSS. MTU may depend on other things (OSPF for example).
Make a sweep of a ping with DF bit set with the size (from 1300 bytes for example). By doing this, you want to check what is the maximum size of the package, which you can test through the IPsec tunnel. Once you have this value consider - subtract 40 and this defined as value MSS of the LAN interface (and adjust the value of PIX if you can).
M.
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WRVS4400N VPN Passthrough issues
I had a WRVS4400N router for 8-9 months. When it is connected to a remote VPN, the PC will go down intermittently to connect to the remote VPN server. Anything running on the connection, such as distance or vSphere client or network file browsing, office will be temporarily unusable, then the connection is re-established. Usually one drop lasts several seconds and varies in frequency.
A few notes:
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-J' have tried disabling UPnP, firewall and IPS without success.
I tried using wireshark, but can't identify something specific. The traffic seems to just stop for 5-10 seconds before resuming.
Any suggestions/help would be appreciated.
Mr Champion,
Have you tried just the quickvpn client and the view if your always get disconnected?
If it is stable and pull-out decision still does not work, maybe try to download a fresh firmware of cisco.com, then reflash the router with firmware then reset factory of the router and manually reconfigure your settings and see if your seeing the same issue.
I would like to know how it works.
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My apologies for repeated postings but that's what you need to do
From a Windows device use this: C:\ > ping-f-l packet_size_in_bytes destination_IP_address.
The -f option is used to specify that the package cannot be fragmented. The -l option is used to specify the length of the packet. First try this with a packet of 1500 size. For example, ping -f - l 1500 192.168.100. If the fragmentation is required but cannot be performed, you receive a message like this: packages need to be fragmented but DF parameter.
suspended f in my last post
# You can try your command prompt
ping f-l 1380
so he sends a ping of 1380 bytes
then you should see something like this, if it does not receive through
C:\Documents and Settings\jathaval > ping 4.2.2.2 f-l 1380
4.2.2.2 ping with 1380 bytes of data:
Packet needs to be fragmented but DF parameter.
Packet needs to be fragmented but DF parameter.
Packet needs to be fragmented but DF parameter.
Packet needs to be fragmented but DF parameter. -
We will deploy a site to another using two ASA5505 VPN. I'll go through has a 1320 max MTU. I determined this by experimenting with pings of different sizes.
How can I configure the MTU on my ASAs?
I'm using these two commands, but I don't know if there are implications to this...
outdoor IP MTU, 1320
IP MTU inside 1280
Your comments are appreciated.
You need not change the MTU itself interfaces. But note that you need to prevent traffic ICMP do the work of PMTUD mechanism. If your correct mtu setting will be established on remote hosts that acts via VPN.
HTH. Please rate if this was helpful. Thank you.
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I guess the question is associated with NAT.
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control plan
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you have ruled out the IP address of the customer the NAT pool
either denying them in access list 1
or do road map that point to the loopback address as a next hop for any destent package for your pool to avoid nat
first try to put this article in your access-lst 110
access-list 110 deny 192.168.2.0 0.0.0.255 192.168.3.0 0.0.0.255
access-list 110 permit 192.168.2.0 0.0.0.255 any
sheep allow 10 route map
corresponds to the IP 110
remove your old nat and type following one
IP nat inside source overload map route interface fastethernet0 sheep
rate if useful
and let me know, good luck
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Anyconnect VPN migration issues
Hi, I do Anyconnect VPN from an ASA ASA migration another. I need your suggestion. Migration must transfer customization and anyconnect vpn configuration. After that I reviewed some documents, looks like the configuration and customization are not the only thing that needs to be transferred. Everything can give some suggestion exactly what needs to be transferred in addition to customization and configuration vpn? Thank you
Hello
Although the copy of the configuration of one firewall to another will get all the anyconnect rules and the installation program completed, but the flash content (IE anyconnect programs, profiles anyconnect, customizations anyconnect, bookmarks, and dap profiles) is not transferred to the other ASA. They must be downloaded manually to the ASA again.
Another way to do this is through ASDM,
Go to tools > configuration backup:
Select the components of the VPN you want to create a backup for.
NOTE *.
This backup will be restored as a whole via ASDM and substitute another configuration.
So, you might want to restore the backup to a fresh firewall and then import the configuration and the images of the SAA.Otherwise, you can go the ususal path, the anyconnect first configuration copy and then manually transfer components anyconnect flash of one ASA to another.
**********
Kind regards
Dinesh MoudgilPS Please rate helpful messages.
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RVS4000 / WRVS4400 VPN routing issue.
I would like to simplify my installation a bit, but unfortunately I do not know how to do this.
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Hi guys,.
I set up a VPN on Cisco ASA & our mobility users are able to connect VPN successfully and access my LAN environment but our senior management says there provide less security & any hacker can hack easily.
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In short, you have just a few steps:
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Easy vpn server issues of Cisco 800 series.
Hello.
I want to deploy the easy vpn server on cisco 876 and 877 10 routers and access from a remote location (company headquarters). When I leave the firewall of the router off the vpn server works. When I turn it on it doesn't.
Although I allow all traffic to my ip for example 80.76.61.158 I can't access the vpn server.
I tried a place to let the firewall off and it worked fine.
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Hi, please find the attachment.
I want remote access client vpn server that connect you to my ASA 5510 outside interface.
Is this possible via the static route set or something else?
Thank you very much!!!
Hello
There is not enough information to give a good answer. This should be possible, but your level ASA software firewall and VPN Client configurations factor in this also.
If you have a customer VPN Split Tunnel configuration, then you must add a rule to the existing ACL and say the IP address of the server. If you use Client VPN full Tunnel while you don't have to worry about the same thing only with Split Tunnel.
Then you will probably need the configuration "permit same-security-traffic intra-interface" so that traffic can enter the 'outside' and leave 'outside' to the server. It won't work without the mentioned order.
You will also need a PAT Dynamics example
If you use a software 8.2 or below and have this dynamic PAT defect for LAN users
Global 1 interface (outside)
NAT (1 x.x.x.x y.y.y.y inside)
Then for the Pool of Client VPN you can add this
NAT (outside) 1 20.20.20.0 255.255.255.0
More often, this should be sufficient to allow the traffic to arrive on the VPN Client user ASA and out of 'outside' interface and head to the server.
Hope this helps
Don't forget to mark the reply as the answer if it answered your question.
-Jouni
-
VPN / Natting issue - connectivity to 3rd Party Partner Site
Hello
I received a request to provide a connectivity solution between our private server 10.102.x.y and a3rd advantage partner server. 10.247.x.y solution of VPN site to site. I want to hide our real IP of 10.102.x.y and replace 10.160.x.y (using Natting).
The configuration is the following:
3rd party partner server->
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NAT'd IP10.160.xy
My dogs entered so far (still awaiting 3rd party to set up their ASA)
name 10.160.x.y OurNat'dServer
crypto ISAKMP policy 6
preshared authentication
aes-256 encryption
sha hash
Group 5
lifetime 28800Crypto ipsec transform-set 3rd Party esp-aes-256 esp-sha-hmac
3rd party ip host 10.160.x.y host 10.247.x.y allowed extended access list
tunnel-group 80.x.x.x type ipsec-l2l
80.x.x.x group of tunnel ipsec-attributes
pre-shared key xxxxxxxxxfootball match 117 card crypto vpnmap address 3rd party
card crypto vpnmap 117 counterpart set 80.x.x.x
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Thanks in advance,
Select this option.
Hello
Who will break actually internet traffic with this server because the external address that is sent over the internet is considered to be a 10.160.x.y. In the past, I did something like this:
public static 10.160.x.y (Interior, exterior), list-dest-3rdParty access policy
policy-dest-3rdParty of the ip host 10.102.x.y host 10.247.x.y allowed extended access list
Who will ONLY perform NAT traffic on this server if traffic is coming from the 10.247.x.y.
-
Here's my problem, with a bit of luck can someone help...
I use the Cisco client to establish a connection with a client. Once the connection is established that I can navigate is more on my local network. Here are the results of the command ipconfig for the local card and the VPN adapter.
Any help would be greatly appreciated.
Windows IP configuration
Name of the host...: nvcadmin06
Primary Dns suffix...:
... Node type: unknown
Active... IP routing: No.
Active... proxy WINS: No.
Ethernet connection to the Local network card:
The connection-specific DNS suffix. :
... Description: Broadcom NetXtreme 57xx Gigabit Controller
Physical address.... : 00-18-8B-00-5C-B1
DHCP active...: No.
... The IP address: 10.20.0.5
... Subnet mask: 255.0.0.0.
... Default gateway. : 10.0.0.1.
DNS servers...: 10.0.0.1.
208.67.222.222
Ethernet connection to the network space 2 card:
The connection-specific DNS suffix. :
... Description: Cisco Systems VPN card
Physical address.... : 00-05-9A-3C-78-00
DHCP active...: No.
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... Subnet mask: 255.0.0.0.
... Default gateway. :
DNS servers...: 192.168.2.19
Thank you in advance.
Hi Eric,.
Unfortunately not, this is controlled by the VPN server.
You can try changing the routing on your machine by using static routes, but it is not supported, because it is considered a security risk.
I would recommend you to communicate with the remote administrator and explain that you must "split tunneling" instead of "tunnelall".
Thank you.
Portu.
Please note all useful posts
-
Hello
I've successfully connected two RV042s to establish a VPN gateway to connect to a VPN gateway. I have follow up questions, please comment:
1. I want to keep the time of indefinite VPN tunnel connection. Is it enough by ticking the 'Keep-Alive' on the VPN-> gateway-to-gateway-> page in advance? Or, I ping the RV042 periodically?
2. the "Phase 1/Phase 2 times of HIS life" (on-> page from gateway to gateway VPN) settings have no impact on the maintenance of indefinite time of VPN connection? What are the optimal values for them?
3. is there an API, command or a script to replace a manual by clicking on the button "CONNECT" to establish the VPN to VPN tunnel-> summary page? Or, is there a way to achieve the power upward?
4. is there a way to establish a VPN tunnel bypassing the connection and clicking on the button "CONNECT"? (Auto connect to power up)?
Thank you in advance for the comments.
Steve
Hello Stephen
I have a question as well. We have a RV042 that does not restore the connection
unless we hit the Connect button. Then everything is fine - after a while he gave up the connection
Yet once and we have to connect and log in again
Still having the problem?
Mike
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How can I stop the wlmailhtml error message: {7E3ABD00-6AC5-40EB-827C-74D699EC41A4} mid://00000006/ upon receipt of mail from itunes?
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Touchpad problems with Windows Vista, HP Pavilion dv7
For some time now, I had problems using the touchpad on my HP Pavilion dv7-1260 mobile. When I press the left button of the mouse, I have the menu that is displayed when you press the right button of the mouse. I changed the settings on a million t
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Window7 Home premium 64-bit system requirements
I have Dell studio 1555, with my computer laptop I have Window7 Home Premium 64-bit but now I have a problem by resettling in my laptop. my DVD of the OS is unresponsive. I need installation file and how can I install it with pen drive. Please help m