Hi all ! I have a "common" working setup as follows : Internet | | Linux Box Gigabit ethernet card with vlan tagging | | Switch | dozens of vlans I have 3 routers setup this way. On all of them, I setup the gigabit ehternet card (ns83820 driver) to have a MTU of 1504, to make room for the vlan tag. On one of the router, all vlans have mtu of 1500 (I didn't specified it.) On the other 2, all vlans hav mtu of 1504. All of this is working like a charm, until lately, where I have to play a little woth mtu to solve a problem with FreeSwan (ipsec tunnel) and large packets... So, my question is : What should be the MTU of a vlan pseudo-interface ? And do we need to specify it ? Nicolas
