Some parts / aspects of this topic have been discussed here before. Leading up to my question:
- eth0 is the official nic of my ubuntu 12.04-server
- eth1 is the "local=yes" port of bridge 'br1'
- eth1/br1 have no ip address
- all VirtualBox guest machines use Bridged Adapter: br1(/eth1)
- all real and virtual machines are on the same subnet
- one end of (almost) all network cables is plugged into a Netgear FS726T Smart Switch
It works well. Everyone is reaching Samba (on eth0), each other's shared folders, printer, NAS and Internet.
Prior to VirtualBox it was VMware Server who bridged all guest traffic to eth1. And prior to that, I used only one network adapter for everything. It was hell. All it took was a backup, an up/download from NAS, either from or to the host or a guest, and the mail server, remote desktop, VNC, Citrix or PuTTY sessions would drop / time out [*].
I see no storm raging but... Nonetheless, what network options should I use (or avoid!) to prevent bad and evil traffic patterns?
[*]: I just found this post here https://serverfault.com/a/136985/167502 which might have been the culprit, although it worked well after vmnet used eth1.