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IPsec VPN with 2 PIX firewalls and 1 2600 router

bhansen70
Level 1
Level 1

Does anyone know if it's possible to setup a full mesh VPN topology when using 2 Cisco PIX firewalls and 1 Cisco 2600 router. I have no issues at all getting the VPN up between the PIX firewalls and 1 tunnel up between the router and PIX. The problem i am having is when trying to get the second tunnel from the router to the second PIX up and running.

5 Replies 5

Jon Marshall
Hall of Fame
Hall of Fame

Hi

All the devices you mention can do multiple tunnels so there should not be an issue with creating a full mesh between them.

Suspect it may be a configuration issue ? Perhaps you could post the configs.

Jon

Here is the Configs i have right now. The PIX VPN is working just fine so i think there is something missing on the Router side of the VPN to the 2 PIX firewalls.

Thanks

Hi

Which VPN tunnel is not working ?

In your router config it is a bit confusing as access-list 101 refers to 192.168.31.0/24 which matches all your other configs on the pix firewalls.

Access-list 102 however references 192.168.3.x. Unless this is a typo this would mean that this traffic would get natted and hence would not initiate a VPN tunnel ie.

Pix1 thinks traffic should be coming from 192.168.31.0/24. However because your access-list 102 is referencing 192.168.3.x/24 then the 192.168.31.x traffic from your 2600 will get natted and hence will not match at the pix end.

Does this make sense ??

Jon

Yes that did make some sense. I was able to get the tunnels all up and working in the mesh configuration by just rebuilding ACL 101 to deny the other 2 remote offices to bypass NAT.

access-list 101 deny ip 192.168.31.0 0.0.0.255 192.168.1.0 0.0.0.255

access-list 101 deny ip 192.168.31.0 0.0.0.255 10.1.52.0 0.0.0.255

access-list 101 deny ip 192.168.31.0 0.0.0.255 10.169.88.0 0.0.0.255

access-list 101 permit ip 192.168.31.0 0.0.0.255 any

Then i just used my nonat policy to match ip address 101

Once i did that everything came up just fine and working great now.

Thanks for your input it was good information.

No problem, glad you got it sorted.

Jon

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