Network problems with Ubuntu 10.10 guest

[coldhb]

Hi all!

I have a strange issue with Virtualbox 3.2.10.

Host: Ubuntu 10.10 amd64 desktop
Guest: Ubuntu 10.10 amd64 server

There is one physical ethernet adapter attached to the host. The guest's ethernet is on "bridged adapter" mode. Both, the host and the guest, get public IP-address with DHCP. The guest runs only a ssh daemon, there's no firewall or another daemons.

Here is how I can reproduce the issue:

1. I start the guest (server distribution, no X)
2. Then I leave guest's console alone
3. Then I use an another computer and connect to the guest with SSH
4. Next I leave the SSH connection alone
5. The SSH connection jams in ~10-15 minutes
6. I can't reconnect with SSH
7. Then I return to the guest's console to create some network interaction with programs like ping, web browser and tcpdump.
8. Now I can connect from the another computer to the guest with SSH again.

Problem exists with and without the guest additions.

Any ideas? Thanks!

[frank]

Which guest network adapter did you choose (VM network settings / advanced)? Try to choose the other network card.

[coldhb]

I tried first Vbox's default guest adapter Intel PRO/1000 MT Desktop and after that PCnet-FAST III. Same issue with both of them.

EDIT: Also tried with PCnet-PCI II and Paravirtualized Network (virtio-net) - no luck!