-----Original Message----- From: Stephen Hemminger [mailto:shemminger@xxxxxxxxxxxxxxxxxxxx] Sent: Monday, 29 October 2007 4:12 PM To: Leigh Sharpe Cc: bridge@xxxxxxxxxxxxxxxxxxxxxxxxxx Subject: Re: Small packets On Mon, 29 Oct 2007 15:37:52 +1100 "Leigh Sharpe" <lsharpe@xxxxxxxxxxxxxxxxxxxxxx> wrote: >> Which seems to bridge OK. However, I have noticed that the bridge >> appears to be truncating some packets. In particular, I am worried >> about packets such as IP ACK's, which are entering the bridge as >> 64-byte packets, but coming out the other side as 60-byte packets. >> As I recall, the smallest valid ehternet packet is 64 bytes. The >> bridge seems to be removing any padding in the packet and sending it >> on it's way as a packet smaller than the minimum ethernet packet >> size. Looking at the packet distribution on other devices connected >> to the bridge, it seems to be doing the same to lots of other > packets, too. Anybody got any idea why the bridge might be truncating > packets? Any idea why it's sending 60-byte packets, when the minimu > should be 64? Or where to tell it to pad all packets out to 64 bytes? > > > Leigh. > >What hardware? It could be a driver bug. >Also if you use VLAN's then the driver may send 60 byte packet (because >of the 4 byte VLAN tag). Standard e1000 hardware. The packets being bridged contain a VLAN tag, which is included in the 60 bytes. _______________________________________________ Bridge mailing list Bridge@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/bridge
