Re: SSH VPN trouble

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Hi Knut,

First of all, sorry for the late reply.

On Tue, 2008-07-08 at 13:03 +0200, Knut Saastad wrote:
> 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.

I understand why using the same network on both sides is a bad idea from
a routing point of view.  I originally wanted to come up with a solution
for the usual problem of VPNing two 192.168.1.0/24 networks.

> 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.

I see, NATing is the solution here.  How would you implement such a
scenario?  I guess iptables is the key.

Thank you!

> 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!
> >
> >   
> 
-- 
Laci  <http://monda.hu>

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