Re: Dynamips dot1q issue (quad nics) [Take 2]

Hi Shane,

I recently had a conversation with someone on Twitter who was facing the
same problem [1]. It seems like new Ubuntu releases and the Linux Kernel
are using VLAN offloading.

Just install the software "ethtool". With it you can display Ethernet
properties of your NIC and it also allows you to change them.

apt-get install ethtool

Find out if VLAN offloading is enabled for eth0:

ethtool -k eth0 | grep vlan-offl"

Disable VLAN offloading on eth0:

sudo ethtool -K eth0 rxvlan off && sudo ethtool -K eth0 txvlan off

Regards,

Jochen

1) https://twitter.com/BobMcCouch/status/240439382153236481

Blogs and organic groups at http://www.ccie.net
Received on Sat Sep 01 2012 - 13:45:27 ART