On Sat, Nov 25, 2006 at 10:04:23PM -0800, kasra kangavari wrote: > Dear Roman > > If I don't use trunk over linux bridges(packets without vlan tag) then I can ping more than 1500bytes(MTU).the problem is vlan tagged packets. r u sure about jumbo frames that solve this problem ? Did you have a look at the MTUs of the interfaces? If you need to support VLAN tagged frames, at least the physical interfaces need to accept frames with additional 4 bytes on the wire. If this is not handled in the driver the 1500+ETH+VLAN-frames will already be dropped (not even be received) at the physical interfaces. You may have to allow an MTU of 1504 for this reason. Regards, Lutz -- Dr.-Ing. Lutz Jänicke CTO Innominate Security Technologies AG /protecting industrial networks/ tel: +49.30.6392-3308 fax: +49.30.6392-3307 Albert-Einstein-Str. 14 D-12489 Berlin, Germany www.innominate.com --------------------------------------------------------------- Visit us at the SPS/IPC/Drives in Nuernberg 28 - 30 November 2006, Hall 9, Stand 9-125 ---------------------------------------------------------------
