On Mon, 29 Oct 2007 15:37:52 +1100 "Leigh Sharpe" <lsharpe@xxxxxxxxxxxxxxxxxxxxxx> wrote: > Hi All, > I have a bridge set up thusly: > > > brctl addbr br0 # Create the bridge. > > brctl addif br0 eth2 # Add eth2 > brctl addif br0 eth3 # And eth3 > > brctl setfd br0 0 # Forward immediately. > > brctl stp br0 off # Turn off Spanning > Tree. > > ifconfig eth2 up # bring up eth2 > ifconfig eth3 up # Bring up eth3 > ifconfig br0 up # Bring up the bridge. > > 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. > > > > > Regards, > Leigh > > Leigh Sharpe > Network Systems Engineer > Pacific Wireless > Ph +61 3 9584 8966 > Mob 0408 009 502 > Helpdesk 1300 300 616 > email lsharpe@xxxxxxxxxxxxxxxxxxxxxx > <blocked::mailto:lsharpe@xxxxxxxxxxxxxxxxxxxxxx> > web www.pacificwireless.com.au > <blocked::http://www.pacificwireless.com.au/> > 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). _______________________________________________ Bridge mailing list Bridge@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/bridge
