Question

VPN routing

Asked by: jlazanowski

I have a network on a remotely connected WAN that I wish to allow access to from a IPSEC VPN session (Cisco client)

Network looks a little bit like this

Internet -- Outside Router -- PIX Firewall -- Inside Router -- MPLS -- Router - Remote Network

My VPN currently works fine to the inside router, however i am unable to access the remote network. When I do a tracert on the remote network I can see that it's not attempting to route it through thte connection, instead its trying to route it via the internet.

I'd post my PIX configuration here except that it's completely massive and may be more than your interested in seeing. How do I go about getting the traffic to route to this remote network?

As a side note, I have included a route inside x.x.x.x statement on the PIX for this remote network.

Thanks

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Asked On
2009-09-28 at 06:00:28ID24766623
Topics

Cisco PIX Firewall

,

Networking Hardware Firewalls

,

Virtual Private Networking (VPN)

Participating Experts
4
Points
500
Comments
12

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Answers

 

by: ccie22921Posted on 2009-09-28 at 06:14:23ID: 25439013

It would help to see the PIX configuration, but immediate insight might be given to the NAT statements that are relevant to your issue.  More so, sounds like you need to include the VPN traffic in a "No-Nat" statement so that the VPN traffic is not natted. I understand it is large, but it would make troubleshooting somewhat easier.

 

by: surbabu140977Posted on 2009-09-28 at 06:19:59ID: 25439056

1)Adding the static is fine, but once you connect via the vpn, do a "route print" (windows) or "netstat -rn"(if linux/unix)in your desktop to see if the remote network appears in your routing table or not. If not, then you have to advertise it first so that it comes to your desktop routing table first.
2)Does the remote MPLS segment have route towards your vpn IP?

 

by: ikalmarPosted on 2009-09-28 at 06:24:29ID: 25439085

Hi,

It seems you want to use hairpinning?

http://www.petenetlive.com/TecBin/KB/0000040.htm

Did you configured on nonat statement the VPN client traffic to remote network, and is the remote network routers konow the CPN cilents network addess?

 

by: jlazanowskiPosted on 2009-09-28 at 06:52:57ID: 25439312

I've attached a partial configuration that should give you all what you're looking for.
access-list 100 extended permit ip 172.16.100.0 255.255.255.0 10.1.1.0 255.255.255.0
access-list 100 extended permit ip 172.16.100.0 255.255.255.0 172.16.104.0 255.255.255.0
access-list 100 extended permit ip 172.16.225.0 255.255.255.0 172.16.105.0 255.255.255.0
access-list 100 extended permit ip 172.16.100.0 255.255.255.0 172.16.105.0 255.255.255.0
access-list 100 extended permit ip 172.16.101.0 255.255.255.0 172.16.105.0 255.255.255.0
access-list 100 extended permit ip 172.16.102.0 255.255.255.0 172.16.105.0 255.255.255.0
access-list 100 extended permit ip 172.16.103.0 255.255.255.0 172.16.105.0 255.255.255.0
access-list 100 extended permit ip 172.16.106.0 255.255.255.0 10.1.1.0 255.255.255.0
access-list 100 extended permit ip 172.16.225.0 255.255.255.0 172.16.102.0 255.255.255.0
access-list 100 extended permit ip 172.16.100.0 255.255.255.0 172.16.102.0 255.255.255.0
access-list 100 extended permit ip 172.16.101.0 255.255.255.0 172.16.102.0 255.255.255.0
access-list 100 extended permit ip 172.16.103.0 255.255.255.0 172.16.102.0 255.255.255.0
access-list 100 extended permit ip 172.16.107.0 255.255.255.0 10.1.1.0 255.255.255.0
access-list 100 extended permit ip 172.16.200.0 255.255.255.0 10.1.1.0 255.255.255.0
access-list 100 extended permit ip 172.16.102.0 255.255.255.0 10.1.1.0 255.255.255.0
access-list 100 extended permit ip 172.16.225.0 255.255.255.0 172.16.108.0 255.255.255.0
access-list 100 extended permit ip 172.16.100.0 255.255.255.0 172.16.108.0 255.255.255.0
access-list 100 extended permit ip 172.16.225.0 255.255.255.0 172.16.101.0 255.255.255.0
access-list 100 extended permit ip 172.16.100.0 255.255.255.0 172.16.101.0 255.255.255.0
access-list 100 extended permit ip 172.16.102.0 255.255.255.0 172.16.101.0 255.255.255.0
access-list 100 extended permit ip 10.1.1.0 255.255.255.0 172.16.101.0 255.255.255.0
access-list 100 extended permit ip 172.16.100.0 255.255.255.0 10.10.10.0 255.255.255.0
access-list 100 extended permit ip 172.16.106.0 255.255.255.0 10.10.10.0 255.255.255.0
access-list 100 extended permit ip 172.16.107.0 255.255.255.0 10.10.10.0 255.255.255.0
access-list 100 extended permit ip 172.16.200.0 255.255.255.0 10.10.10.0 255.255.255.0
access-list 100 extended permit ip 172.16.102.0 255.255.255.0 10.10.10.0 255.255.255.0
access-list 100 extended permit ip 10.10.10.0 255.255.255.0 172.16.101.0 255.255.255.0
access-list 100 extended permit ip 172.16.225.0 255.255.255.0 172.16.109.0 255.255.255.0
access-list 100 extended permit ip 172.16.100.0 255.255.255.0 172.16.109.0 255.255.255.0
access-list 100 extended permit ip 172.16.225.0 255.255.255.0 172.16.110.0 255.255.255.0
access-list 100 extended permit ip 172.16.100.0 255.255.255.0 172.16.110.0 255.255.255.0
access-list 100 extended permit ip 172.16.107.0 255.255.255.0 192.168.2.0 255.255.255.0
access-list 100 extended permit ip 172.16.200.0 255.255.255.0 192.168.2.0 255.255.255.0
access-list 100 extended permit ip 192.168.2.0 255.255.255.0 172.16.100.0 255.255.255.0
access-list 100 extended permit ip 192.168.2.0 255.255.255.0 172.16.107.0 255.255.255.0
access-list 100 extended permit ip 172.16.225.0 255.255.255.0 192.168.2.0 255.255.255.0
access-list 100 extended permit ip 172.16.100.0 255.255.255.0 192.168.2.0 255.255.255.0
access-list 100 extended permit ip 172.16.100.0 255.255.255.0 172.16.106.0 255.255.255.0
access-list 100 extended permit ip 172.16.225.0 255.255.255.0 172.16.106.0 255.255.255.0
access-list 100 extended permit ip 172.16.225.0 255.255.255.0 172.16.112.0 255.255.255.0
access-list 100 extended permit ip 172.16.100.0 255.255.255.0 172.16.112.0 255.255.255.0
access-list 100 extended permit ip 10.10.10.0 255.255.255.0 172.16.112.0 255.255.255.0
access-list 100 extended permit ip 192.168.2.0 255.255.255.0 172.16.112.0 255.255.255.0
access-list 100 extended permit ip 172.16.225.0 255.255.255.0 172.16.107.0 255.255.255.0
access-list 100 extended permit ip 172.16.100.0 255.255.255.0 172.16.107.0 255.255.255.0
access-list 100 extended permit ip 10.10.10.0 255.255.255.0 172.16.107.0 255.255.255.0
access-list 100 extended permit ip 172.16.100.0 255.255.255.0 172.16.111.0 255.255.255.0
access-list 100 extended permit ip 172.16.225.0 255.255.255.0 172.16.111.0 255.255.255.0
access-list 100 extended permit ip 172.16.100.0 255.255.255.0 206.195.31.0 255.255.255.0
access-list 100 extended permit ip 172.16.225.0 255.255.255.0 172.16.120.0 255.255.255.0
access-list 100 extended permit ip 172.16.100.0 255.255.255.0 172.16.120.0 255.255.255.0
access-list 100 extended permit ip 172.16.225.0 255.255.255.0 172.16.113.0 255.255.255.0
access-list 100 extended permit ip 172.16.100.0 255.255.255.0 172.16.113.0 255.255.255.0
access-list 100 extended permit ip 10.10.10.0 255.255.255.0 1.18.44.0 255.255.255.0
access-list 100 extended permit ip 1.18.44.0 255.255.255.0 10.10.10.0 255.255.255.0 (this is the new remote network I'm trying to access)



global (outside2) 1 interface
nat (inside) 0 access-list 100
nat (inside) 1 0.0.0.0 0.0.0.0

route outside 0.0.0.0 0.0.0.0 65.xxx.xxx.1 1
route inside 1.18.44.0 255.255.255.0 172.16.225.1 1 (new network trying to route to)
route inside 172.16.100.0 255.255.255.0 172.16.225.1 1 (this network works correctly via VPN)
route inside 172.16.103.0 255.255.255.0 172.16.225.1 1



To answer other questions.

1.)  Hairpining uses the same interface, in this case I'm routing from the outside -- inside although I do already have hairpining enabled for other purposes.

2.) MPLS routes via BGP and the new network is advertised, default route for the VPN network points back to the BGP host router, which in turns routes 0.0.0.0 to the PIX

 

by: Darkstriker69Posted on 2009-09-28 at 07:15:48ID: 25439486

1.18.44.0 - is NOT a private IP address

 

by: jlazanowskiPosted on 2009-09-28 at 07:18:57ID: 25439512

I'm aware that it's not in a private range, a vendor created this address on some process control equipment and I'm stuck with it. 1.18.x.x actually dosen't route anywhere on the internet, so using it shouldn't cause much harm.

Regardless I still need to find a way to connect to this address via VPN.

 

by: ikalmarPosted on 2009-09-28 at 07:23:09ID: 25439552

ok, the 10.10.10.0/24 the vpn pool?

 

by: jlazanowskiPosted on 2009-09-28 at 07:25:19ID: 25439582

That's correct 10.10.10.x is the VPN DHCP Pool

 

by: ikalmarPosted on 2009-09-28 at 07:28:39ID: 25439618

If the MPLS network have route to 10.10.10.0/24 it working

 

by: jlazanowskiPosted on 2009-09-28 at 07:34:12ID: 25439678

Not sure I follow

The MPLS network router (at the host connected to the PIX)

route 0.0.0.0 0.0.0.0 PIX

Thus the MPLS network has access to the PIX or 10.10.10.x network pool. Am I missing something?

 

by: Darkstriker69Posted on 2009-09-28 at 12:36:03ID: 25442515

I am going to have to reiterate:
1.18.44.0 - is NOT a private IP address
Which I believe will cause you problems.

However, we can troubleshoot:

If you connect the Cisco VPN client on a PC and then do a "Route Print" in command prompt. See if there is a line that reads:

1.18.44.0     255.255.255.0     10.10.10.x     10.10.10.1     100

This shows that the PIX has added the correct route to the client, if not the PC will try to connect through the interent which I believe is what you are describing here:

"When I do a tracert on the remote network I can see that it's not attempting to route it through thte connection, instead its trying to route it via the internet."





 

by: jlazanowskiPosted on 2009-09-28 at 13:06:36ID: 31634340

I'm distributing the points among all of you.

My issue was actually due to a split tunnel. I neglected to add the new range to the tunnel split ACL, causing client not to inject the route.

20120131-EE-VQP-002

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