Hi,

I started working with gns3 a few time ago and I followed the tutorial provided at the website but i'm having a problem with the connection of gns3 to a real network. I'm working with Ubuntu and I configured the loopback adapter (tap0 interface) as follows:

•[root]#modprobe tun
•[root]#tunctl
•[root]#ifconfig tap0 10.100.100.100 netmask 255.255.255.0 up

I didn't have any problems with this but, for example, in the next topology I can ping from my computer (tap0 interface) to the interface of the router in the same network (fastethernet0/0) but i cannot ping to any interface in other network (neither serial1/0 of router1 or router2).

<computer>(tap0 interface)----------------(fastethernet0/0)<router1>(serial1/0)----------------(serial1/0)<router 2>

I enabled the RIP protocol in both router 1 and router 2. I found a solution: define the interface fastethernet0/0 as default gateway for the computer. But the problem is that the whole traffic is redirected to there and I lose the Internet connection. Can anyone find any other solution for this? I would really appreciate.

enable NAT on R1 ;)

Best Regards,
Sikas.