virtualbox.org

Hi all,

I have two internal nets (192.168.10.0/24 and 192.168.11.0/24). Therefore, I've installed 1 server and 2 clients:

Server
- eth0: 192.168.10.254
- eth1: 192.168.11.254
- Routing Table has two entries:
192.168.10.0 /// 0.0.0.0 /// eth0
192.168.11.0 /// 0.0.0.0 /// eth1

Client 1
- eth0: 192.168.10.1
- Routing Table has two entries:
192.168.10.0 /// 0.0.0.0 /// eth0
0.0.0.0 /// 192.168.10.254 /// eth0

Client 2
- eth0: 192.168.11.1
- Routing Table has two entries:
192.168.11.0 /// 0.0.0.0 /// eth0
0.0.0.0 /// 192.168.11.254 /// eth0

The following pings are working:
- Client 1/2 --> 192.168.10.254
- Client 1/2 --> 192.168.11.254
- Server --> 192.168.10.1
- Server --> 192.168.11.1

The following pings ARE NOT WORKING:
- Client 1 -> 192.168.11.1
- Client 2 -> 192.168.10.1

Why can't the clients ping each other? They should be routed over the server, isn't it? On the server, I can see the pings with tcpdump....

Thanks,
pfust

Did you actually enable and configure routing options in the Server VM? Without it, you won't get anything nor go anywhere.

Yeah, that was it!
As I'm Ubuntu Server I had to turn net.ipv4.ip_forward=1 in /etc/sysctl.conf...

Thanks a lot,
pfust