Interpret what is allowed on the VPN tunnel
Hello
I work with Cisco PIX equipment for the first time and I'm trying to understand what is allowed on one of the VPN tunnels which are established on the PIX.
I interpret this PIX did by reading the running configuration. I was able to understand most of it (with the help of the cisco site), so I'm starting to get comfortable with it. I'm looking for more help in the interpretation of what is allowed by a good VPN tunnel. Here are some details:
map Cyril 2 ipsec-isakmp crypto
Cyril 2 crypto card matches the acl-vpntalk address
access list acl-vpntalk allowed ip object-group my_inside_network 172.17.144.0 255.255.255.0
So, if I interpret it correctly, then the traffic matching ACL acl-vpntalk will go on the VPN tunnel.
As far as the lists others access dedicated, my inner interface I have:
Access-group acl-Interior interface inside
With ACL-Interior:
access list acl-Interior ip allow a whole
So nothing complicated there.
Now, just because of all this I conclude I encouraged all remote network traffic in my site. If all traffic 172.17.144.0/24 is allowed to join my network.
However, I don't know if this conclusion is correct.
This ACL is also applied:
Access-group acl-outside in external interface
And it looks like:
deny access list acl-outside ip a
I'm not sure if this ACL applies to vehicles coming from the IPSEC peer. It's for sure inbound on the external interface, but if it is valid for the IPSEC traffic I don't know.
If it is valid, then am I had reason to conclude that only connections initiated from my inside network to the remote control can come back?
Thanks in advance for your ideas.
With sincere friendships.
Kevin
Hey Kevin,
Here are my comments, hope you find them useful:
1. the ACL called "acl-vpntalk" sets traffic who will visit the IPSec tunnel, so you got that right. All traffic from the group called "my_inside_network" will 172.17.144.0/24 will pass through the tunnel, and there should be a similar to the other VPN end opposite ACL.
2. the 'acl-inside' applied to the inside interface allows any ip traffic coming out of the isnide to any destination.
3. the 'acl-outside' rejects all traffic from entering your home network, but the IPSec traffic is free and will cross because you will find a "sysopt connection permit-ipsec' configured on your PIX command that tells the operating system to allow all traffic destined for VPN tunnels without explicitly enabling it through the inbound ACL. If you have stopped the "sysopt" should stop your traffic and you will have more control on your tunnel traffic.
Personally, I usually disable the "sysopt" and control the VPN traffic in my incoming ACL.
Just a quick note, if you look more deeply into the ACL on the PIX functionality, you will find that no traffic moves inside, if she is not allowed on the external interface. For example, you can allow traffic between "inside" and "dmz" interfaces by adding an entry 'allow' on one of the ACLS applied to one of these interfaces. But when you want to allow traffic from the external interface (security level 0), you will need to allow in the inbound ACL applied on the external interface.
I could have written something vague, but I hope you get my point.
Thank you.
Salem.
Tags: Cisco Security
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timeout tcp-proxy-reassembly 0:01:00
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63757265 20536572 76657220 20473330 82012230 0d06092a 864886f7 4341202d
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5becb37f 954afb03 c8ad26db e6667812 4ad99f42 fbe198e6 42839b8f 8f6724e8
6119b5dd cdb50b26 058ec36e c4c875b8 46cfe218 065ea9ae a8819a47 16de0c28
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.....
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Hello! Please consult this document:
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___
HTH. Please rate this post if this has been helpful. If it solves your problem, please mark this message as "right answer".
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Concerning
Pradeep
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!
!
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local AuthorizVPN AAA authorization network
!
AAA - the id of the joint session
clock timezone GMT 1 0
clock summer-time recurring GMT
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IP cef
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VPDN enable
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!
!
model virtual Network1
!
username admin privilege 15 secret 4 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
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redundancy
!
crypto ISAKMP policy 1
BA aes 256
preshared authentication
Group 2
life 3600
!
ISAKMP crypto client configuration group myVPN
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx key
DNS 192.168.0.254
pool IPPoolVPN
ACL 100
!
!
Crypto ipsec transform-set esp - aes esp-sha-hmac T1
tunnel mode
!
!
!
crypto dynamic-map 10 DynMap
game of transformation-T1
market arriere-route
!
!
list of authentication of crypto client myMap AuthentVPN map
card crypto myMap AuthorizVPN isakmp authorization list
client configuration address map myMap crypto answer
card crypto myMap 100-isakmp dynamic ipsec DynMap
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the Embedded-Service-Engine0/0 interface
no ip address
Shutdown
!
interface GigabitEthernet0/0
no ip address
automatic duplex
automatic speed
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PPPoE-client dial-pool-number 1
No mop enabled
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interface GigabitEthernet0/1
LAN description
no ip address
automatic duplex
automatic speed
No mop enabled
!
interface GigabitEthernet0/1.1
LAN description
encapsulation dot1Q 1 native
IP 192.168.0.254 255.255.255.0
IP nat inside
IP virtual-reassembly in
IP tcp adjust-mss 1452
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interface Dialer1
MTU 1492
the negotiated IP address
IP access-group RESTRICT_ENTRY_INTERNET in
NAT outside IP
IP virtual-reassembly in
encapsulation ppp
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PPP authentication pap callin
PPP chap hostname xxxx
PPP chap password 0 xxxx
PPP pap sent-name of user password xxxxx xxxx 0
crypto myMap map
!
IP pool local IPPoolVPN 192.168.10.0 192.168.10.100
IP forward-Protocol ND
!
IP http server
23 class IP http access
local IP http authentication
IP http secure server
IP http timeout policy slowed down 60 life 86400 request 10000
!
The dns server IP
IP dns primary GVA. SOA INTRA NS. GUAM INTRA [email protected] / * / 21600 900 7776000 86400
IP nat inside source list 10 interface Dialer1 overload
overload of IP nat inside source list 11 interface Dialer1
overload of IP nat inside source list 20 interface Dialer1
overload of IP nat inside source list 30 interface Dialer1
overload of IP nat inside source list 110 interface Dialer1
IP route 0.0.0.0 0.0.0.0 Dialer1
Route IP 192.168.0.0 255.255.255.0 GigabitEthernet0/1.1
IP route 192.168.1.0 255.255.255.0 GigabitEthernet0/1.2
!
RESTRICT_ENTRY_INTERNET extended IP access list
TCP refuse any any eq telnet
TCP refuse any any eq 22
TCP refuse any any eq www
TCP refuse any any eq 443
TCP refuse any any eq field
allow udp any any eq 50
allow an ip
!
Dialer-list 1 ip protocol allow
!
!
SNMP - server RO G community
public RO SNMP-server community
entity-sensor threshold traps SNMP-server enable
access-list 10 permit 192.168.0.0 0.0.0.255
access-list 11 permit 192.168.1.0 0.0.0.255
access-list 20 allow 192.168.2.0 0.0.0.255
access-list 30 allow 192.168.3.0 0.0.0.255
access-list 100 permit ip 0.0.0.0 0.0.0.255 192.168.0.0 0.0.0.255
access-list 110 deny ip 192.168.0.0 0.0.0.255 192.168.10.0 0.0.0.255
access ip-list 110 permit a whole
I don't know if it useful, but here is the view the crypto ipsec command his:
Interface: Dialer1
Tag crypto map: myMap, local addr 213.3.1.13
protégé of the vrf: (none)
local ident (addr, mask, prot, port): (0.0.0.0/0.0.0.0/0/0)
Remote ident (addr, mask, prot, port): (192.168.10.12/255.255.255.255/0/0)
current_peer 109.164.161.35 port 49170
LICENCE, flags is {}
#pkts program: 5, #pkts encrypt: 5, #pkts digest: 5
#pkts decaps: 0, #pkts decrypt: 0, #pkts check: 0
compressed #pkts: 0, unzipped #pkts: 0
#pkts uncompressed: 0, #pkts compr. has failed: 0
#pkts not unpacked: 0, #pkts decompress failed: 0
Errors #send 0, #recv 0 errors
local crypto endpt. : 213.3.1.13, remote Start crypto. : 109.164.161.35
Path mtu 1492 mtu 1492 ip, ip mtu BID Dialer1
current outbound SPI: 0x54631F8B (1415782283)
PFS (Y/N): N, Diffie-Hellman group: no
SAS of the esp on arrival:
SPI: 0x8C432353 (2353210195)
transform: aes - esp esp-sha-hmac.
running parameters = {Tunnel UDP-program}
Conn ID: 2033, flow_id: VPN:33 on board, sibling_flags 80000040, crypto card: myMap
calendar of his: service life remaining (k/s) key: (4212355/1423)
Size IV: 16 bytes
support for replay detection: Y
Status: ACTIVE (ACTIVE)
the arrival ah sas:
SAS of the CFP on arrival:
outgoing esp sas:
SPI: 0x54631F8B (1415782283)
transform: aes - esp esp-sha-hmac.
running parameters = {Tunnel UDP-program}
Conn ID: 2034, flow_id: VPN:34 on board, sibling_flags 80000040, crypto card: myMap
calendar of his: service life remaining (k/s) key: (4212354/1423)
Size IV: 16 bytes
support for replay detection: Y
Status: ACTIVE (ACTIVE)
outgoing ah sas:
outgoing CFP sas:
And on the side of the customer, when I go to the status of--> statistics, all packages have been circumvented, nobody is encrypted
Thanks for your help!
Sylvain,
Let me explain again:
IP nat inside source list 10 interface Dialer1 overload
overload of IP nat inside source list 110 interface Dialer1
Here you are from two ACL, but they are the same with the difference, that NAT 10 110 also but WITHOUT user VPN and everything inside. Problem is that 10 matches first, if the connection will not work. You can disable entry NAT with 10 110 because that will also:
no nat ip inside the source list 10 interface Dialer1 overload
That should be enough.
Michael
Please note all useful posts
-
Authentication PEAP wireless across the VPN tunnel
We use routers for Cisco 871 VPN connectivity series. I'm testing the 871W for VPN and wireless connectivity. I am able to get the VPN but have problems with authentication using PEAP and authentication through active directory wireless. The problem is that my router is unable, because of the VPN connection, "talk" directly to my authentication server using the LAN ip address. I can get the authentication works if I pass the traffic through the internet, drill a hole in my firewall to complete the authentication process. This isn't my preferred method. What can I do to work around may lists VPN access that prevent my direct connectivity to my server?
Are you able to ping to the ip address of the radius through the tunnel server?
Try adding this:
radius of the IP source-interface BVI1
* Please rate if helped.
-Kanishka
-
Lost the VPN tunnel between 2 site when internal client using client vpn
We currently have VPN tunnel connected to the remote desktop using router VPN Hotbrick 2.
When 1 of the internal computer try to connect to another server VPN customer using Cisco VPN Client v4.8, she will appear in drop/disable/loss of the tunnel between us VPN and remote offices. The tunnel is still established but no traffice between site 2. (cannot all ping)
What are the causes of the problem? Hotbrik problem? Customer Cisco VPN setting or something else?
I don't know what causes the problem. Help, please. Thanks in advance.
Hello
The problem is that your NAT device will not translating properly, and when the 2nd customer triggers (ISAKMP packets-UDP 500) connections port isn't transalated, so for the SAA is as the first user tries to connect again, then it rejects the initial connection.
The trick is, as you have discovered, use global UDP.
The problem is that UDP 10000 is not a standard, so you need to check if multiple users can be connected at the same time behind the same NAT device.
If this is not the case, use the NAT transparency standard industry (UDP 4500). This should be configured only on the SAA.
Please rate if this helped.
Kind regards
Daniel
-
How to limit the bandwidth in the VPN Tunnels in RV082?
Hello
It is possible to limit the bandwidth of the IPSEC VPN Tunnels or the traffic that goes through the tunnels?
Use IP addresses or port numbers the same way and clients when limiting bandwidth to clients in the local network?
Thank you very much
Oliver
There is a way to solve internal IP addresses, protocols or ports and specify the bandwidth
I send you the links to access information on how to set it up.
-
Hi I have a question.
I hope one of you can help me.
My problem is that I want to the internet using VPN tunnenl.
I have a VPN connection with my ASA 5505 at home.
I am able to access the entire inside of the devices. But I'm unable to access the internet.
is it possible the internet using the internet connection I have at home.
i'f played a bit with the following commands:
same-security-traffic permits intera-interface &
same-security-traffic permit intera-interface & split-tunnel-policy tunnelall
ASA version: 9.1 2
ASDM version: 7.1 (3)
Greetings
Palermo
the client that is connected via VPN you are able to ping 4.2.2.2?
If Yes, if you issue a nslookup google.com is the resolved name?
If this isn't the case, then I think that the following command highlighted is the problem:
Group Policy home-attributes VPNSSL
WINS server no
DNS server no
Ikev1 VPN-tunnel-Protocol, l2tp ipsec ikev2 ssl-clientTry setting your DNS here server and test.
--
Please do not forget to select a correct answer and rate useful posts
-
How to get to the VPN tunnel to the subnet 2/3
I have not yet tried something else a few years back I got on my back which head with an ASA firewall you cannot route traffic to a subnet of second or third (it's 2 or 3 jumps away) on a same VPN tunnel if you add routes to all LAN subnets in all required firewall and tunnels.
I know other manufacturers such as SonicWall, here you can do it, so the question is, is possible in the firewall Cisco ASA with version 7.07 and 7.2.4? If this is not the case, is it possible in a future release? and if this is not possible, how can I make it work? I can't work with a firewall router 1 LAN to LAN s 3?
Attached are also a network card for the visualization of all subnets.
Thanks in advance
Johan Mannerstrom
ICT technician
If the firewall HQ is already connected to LAN2 (way I mean), then you have even connect an interface on the firewall of HQ and in him giving an ip address that belongs to LAN2. As firewall HQ has a route to 192.168.20.0/24 and 18.0/24 and vice versa, that's enough.
And you're on the point on the rest of the steps you have provided regarding the config.
And of course, you must configure matching exemption to ACL and NAT image mirror on the remote VPN encryption too.
-
Go simple traffic over the VPN tunnel
Hi Pros,
We have a problem with the traffic through the VPN. Specific subnets is not able to reach a specific HOST in the HQ, however, the host in the HQ can reach this subent on the remote database. Interresting to traffic to the vpn are mirrored on the other. Here is the partial config of the remote vpn router.
crypto ISAKMP policy 10
BA 3des
preshared authentication
Group 2
ISAKMP crypto key mypubkey9 address 210.199x.2xx.xx
!
!
Crypto ipsec transform-set esp-3des esp-sha-hmac vpn series
!
tunel_traffic 50 ipsec-isakmp crypto map
the value of 210.199x.2xx.xx peer
Set security-association second life 1440
transform-set vpn - Set
PFS group2 Set
match address remote-int-traffic
!
!
!
!
Null0 interface
no ip unreachable
!
interface FastEthernet0/0
IP 1.1.1.3 255.255.255.248
IP virtual-reassembly
route IP cache flow
Speed 100
full-duplex
No mop enabled
!
interface FastEthernet0/1
IP 10.25.24.2 255.255.255.0
NAT outside IP
inspect the SDM_LOW over IP
IP virtual-reassembly
Speed 100
full-duplex
No mop enabled
tunel_traffic card crypto
!
IP route 0.0.0.0 0.0.0.0 10.25.24.2
IP route 1.0.10.0 255.255.255.0 210.199x.2xx.xx (public IP address of the router vpn HQ)
IP route 4.0.x.0 255.255.255.0 210.199x.2xx.xx
IP route 4.0.15.11 255.255.255.255 210.199x.2xx.xx (cannot reach this hot HQ)
IP route 10.254.0.0 255.255.255.0 210.199x.2xx.xx
IP route 10.254.254.56 255.255.255.255 210.199x.2xx.xx
!distance-int-traffic extended IP access list
permit ip host 10.254.254.56 10.1x.200.0 0.0.3.255
Licensing ip to 10.1x.200.0 0.0.3.255 host 10.254.254.56
Licensing ip to 10.1x.20.0 0.0.3.255 host 10.254.254.5
permit host ip 4.0.x.11 10.1x.200.0 0.0.3.255
permit ip 10.1x.200.0 0.0.3.255 host 4.0.x.11
!Thank you
You really set one of the following routes, and it seems wrong that it should really be directed to the jump to next to the router. It should just route through the default route if you have configured listed routes. PLS, delete them if those are all you have configured and left the default route in the configuration.
IP route 1.0.10.0 255.255.255.0 210.199x.2xx.xx (public IP address of the router vpn HQ)
IP route 4.0.x.0 255.255.255.0 210.199x.2xx.xx
IP route 4.0.15.11 255.255.255.255 210.199x.2xx.xx (cannot reach this hot HQ)
IP route 10.254.0.0 255.255.255.0 210.199x.2xx.xx
IP route 10.254.254.56 255.255.255.255 210.199x.2xx.xx
Also, if it works in a way, it is more likely an access-list or a firewall that blocks traffic in one direction.
-
I can NAT before the VPN Tunnel?
Hello
I want to add servers in a configuration in ipsec tunnel site to another for transportation.
However, I have to NAT these machines for the presentation of the other side.
For a Cisco 1760 (vpn termination point) running on 12.3 code, is it possible?
If it's possible, could I get a link to a config? Or maybe an excerpt here?
We use two interfaces ethernet for this:
Ethernet1/0 is inside
ethernet0/0 is outside
Can't seem to find any documentation for it.
Thank you
Paul
It is "NAT order of operation" used by Cisco devices, it seems that NAT is anyway before the crypto control
http://www.Cisco.com/en/us/Tech/tk648/tk361/technologies_tech_note09186a0080133ddd.shtml
Concerning
Farrukh
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