Re: VLAN

Hello,

spip_yeah@xxxxxxxxx a écrit :

Is it necessary to have a VLAN capable NIC in order to have a linux box
participate in a VLAN, or can 802.11q be entirely emulated in sofware
at the driver level?

On Linux IEEE 802.1Q tagging/untagging is done by software in the module 8021q. I have used it on cheap Realtek ethernet cards which I believe do not have special provisions for it.

However some ethernet cards (or their driver, I don't know), are unable to send and/or receive frames with a 1504-byte data length needed to transport tagged frames with a 1500-byte payload. Therefore, VLAN interfaces created on top of such cards with vconfig are limited to a MTU/MRU of 1496. An example is the DEC 21041 (module tulip).
.