My network architecture is very simple:
firewall - 192.168.0.1 running IPCop
vmware - 192.168.0.10 running Ubuntu Server
Both computers are connected to a switch, as well as several workstations in the company (about 20 computers total) and a wireless access point.
At some point (which I haven't been able to determine yet), our Internet connection stops working. If I log into the firewall via SSH it's dead slow (you can barely type on the terminal). To my surprise, as soon as I unplug the VMWare Server from the network, the network goes back to normal.
We tried swapping the firewall for another computer and the problem remained. Any hint on how to track it down? I couldn't find anything relevant on the server logs.
Update with more information:
- The VMWare box has 1 physical NIC and is running about 3 to 5 computers with bridged mode.
- When the connection fails, running top on the firewall does not report huge CPU activity.
- The firewall does not show any information on the logs when this problem happens.
- I can't ping outside from the firewall when this failure manifests.