I'm on a local network with a few other people. On of the hosts is a virtual machine running in virtualbox on a mac, which has the ip address 192.168.0.35 (the VM that is, not the mac host).

Everyone except one guy can connect (ie ping, ssh etc) to that machine. When that one guy tries to ping it he gets

Request timeout for icmp_seq 0
Request timeout for icmp_seq 1
Request timeout for icmp_seq 2

which i understand is just how certain mac os's report an unreachable connection. He can ping all the other hosts on the network, ie our computers, and we can all ping the VM fine and connect to it with no problems etc.

His ip is 192.168.0.17. I ssh'd onto his machine (as a new user 'anon') and saw the same problems.

I can ssh onto the 192.168.0.35 VM as well. From there, i can ping other users, but when i ping the problem guy, it's unreachable that way round as well.

He restarted his mac, and was fine for a while. Then, just stopped working again. He's got a different IP to before.

Any ideas, anyone? Don't know enough about this stuff to even diagnose the problem. thanks, max