Re: bridge between ppp and ethernet - 1 IP address and assign it to another host

[jamal <hadi@cyberus.ca>]

nice solution but maybe challenging to get to work with braindead
windoz machines. 
My thinking is if you have to use windoz then you probably wanna hide
everything from them - which may require kernel hacking (I think it is
worth it ;->).


cheers,
jamal

On Wed, 2005-03-09 at 15:01, Remco van Mook wrote:
> I've been toying with the suggestion to do something with routing table 0 to
> accomplish this, and I can report it works, standard 2.6.10 kernel. Here's how
> I did it:
> 
> Assuming a linux system, connected to a local network 172.16.0.0/24, own
> address 172.16.0.13, 'ppp' ip address to be assigned to a system that has
> ip address 172.16.0.4
> 
> On the box that establishes the PPP connection:
> 1) establish ppp connection, get IP address, say 192.168.0.2
> 2) ip route del local 192.168.0.2
> 3) ip route add 192.168.0.2 via 172.16.0.4
> 
> On the other box, 172.16.0.4:
> 
> 1) ip addr add 192.168.0.2 dev eth0
> 2) ip route add 0/0 via 172.16.0.13
> 
> I didn't bother assigning the IP address for the other box dynamically; that
> might still pose a challenge - outside the scope of netdev IMHO.
> 
> Optionally you might want to SNAT outbound traffic on the PPP interface to
> enforce the correct IP address. Of course the solution doesn't actually
> 'bridge' the traffic, you get another visible hop, but the effect is almost
> the same.
> 
> Kind regards,
> 
> Remco van Mook
>