Same network on both sides of a remote access VPN

Doug Anderson · ‎11-06-2008

I inherited a remote access VPN problem that I'm not sure how to resolve.

I have a PIX 506E with a LAN address of 192.168.1.1/24. It is the default gateway for that LAN. I've configured remote access VPN so that clients authenticate locally to the PIX. This works fine except for users who have 192.168.1.0/24 configured at their home. They connect just fine, but cannot access LAN resources behind the PIX. What suggestions would you offer me?

Thanks in advance.

Collin Clark · ‎11-07-2008

We use a network that home users will probably never have, something like 10.255.255.0 /24. You could also use a public address space, but you have to be careful of it being publicly routable or not.

Hope that helps.

Doug Anderson · ‎11-07-2008

I agree this is the best answer, but I cannot implement that now and have to provide an interim solution.

Any assistance is greatly appreciately.

SOL10 · ‎11-07-2008

If you have configure RAVPN, then what you could do is create a pool of IP on a diff subnet (192.16.10.0/24) and create accesslists for that network to go to 192.168.1.0

e.g

ip local pool RA_POOL 192.168.10.1 -192.168.10.19 255.255.255.255

access-list outside_cryptomap_65534 permit ip host 192.168.10.0 255.255.255.0 192.168.1.0 255.255.255.0

HTH and please rate if useful

husycisco · ‎11-07-2008

Hello Doug,

Here is an interim solution

Lets assume that 172.16.20.0/24 is your VPN pool,

access-list Pnat permit ip 192.168.1.0 255.255.255.0 172.16.20.0 255.255.255.0

static (inside,outside) 10.255.255.0 access-list Pnat

add 10.255.255.0/24 to your split-tunnel ACL and remove 192.168.1.0/24

Remove the ACE permit ip 192.168.1.0 255.255.255.0 to vpnpool from NAT 0 ACL

Now VPN clients can connect the inside clients on same host portion but 10.255.255 subnet portion IP address. Lets say that you have a server in inside with IP 192.168.1.30, now you can connect that server from RA VPN client as 10.255.255.30

If didnt work, post your config and let me modify

Regards