You can use the 8021q module in linux, and the vlan tools to run an interface as a dot1q trunk. I'm not sure off-hand about the other distributions, but under Debian you just need the 'vlan' package. modprobe 8021q ifconfig eth1 up vconfig add eth1 <vlan id> ifconfig eth1.<vlan id> <ip address> netmask <netmask> Configure your switch port to trunk mode, tag your vlans onto it, et voila. This will give you a presence in as many broadcast domains as you decide to tag. - billn On Wed, 19 Mar 2008, Jon R. Kibler wrote:

ann kok wrote:

...

Hi all

I am using linux as router to connect to switch

do you know how to dump packet to see vlan info?

Thank you

You won't see vlan info unless you are on a trunking port.

Jon Kibler