very slow downloads from VM guests when using bridged networking
I have an ubuntu 9.10 machine running as a virtualization host. I am having problems when network clients download from the guest. This only happens when the VMs use bridged mode networking. If I use NAT, then the speeds are fine.
Note that its only network clients downloading from the guest that is slow. Everything else has expected speeds. Speeds are:
host <- guest: 66 MB/s
guest <- host: 36 MB/s
host <- net: 63.4 MB/s
net <- host: 50 MB/s
guest <- net: 25 MB/s
net <- guest: 1 MB/s
This problem occurs with vmware guests and virtualbox guests, which makes me think this is some kind of problem with my networking setup/hardware than a problem with my VMs.
I have tried the following, all without any change in the problem:
* multiple network clients
* added a different gigabit NIC to the host and bound vm bridged network to that interface
* tried doing the transfer on port 8080 instead
* tried briding the VM nic to a different NIC than what the host is using for most communications (i.e. I had two network cables plugged in)
Just tried a linux guest and didn't have any download problems.
Last edited by mrtwice; 12-19-2009 at 10:17 AM.
Reason: added bit about a new NIC, reformatted "tried" section