Re: SSH VPN trouble

Knut Saastad <knut.saastad@xxxxxxxxxxx> · Tue, 08 Jul 2008 13:03:10 +0200

Hi László!

Using the same network on both sides of a VPN will cause trouble for 

you, since your are trying to route traffic between two locations using 

the same identifiers. Traffic originating from one side of your tunnel 

will always have the ipaddress you are trying to reach, listed in its 

routingtable as local, and thus will never try to forward it through the 

ssh-tunnel.

If you cannot change ip-range on either side of the link, I would 

suggest looking into the possibility of 1:1 NAT'ing the traffic on 

receiver side ( i.e 10.0.0.0/8 -> 192.168.1.0/8 ), and the use ie. 

10.168.1.100 to reach 192.168.1.100 from the sender side.

Best regards,
Knut Saastad

László Monda wrote:

Hi List,

I'm trying to build an SSH VPN based on the
https://help.ubuntu.com/community/SSH_VPN Ubuntu howto, but can't get
it done.

After setting up the VPN and trying to connect to the remote host
which is now on my virtual network I realize that I actually connect
to localhost.

This may be because the remote network and the local network are both
192.168.1.0/8.  Do the network adresses of the networks in question
need to differ?

Thanks in advance!