On Thu, Dec 02, 2004 at 08:10:58PM -0800, kingz wrote: > Most mentioned MTU, but how I assure that the problem is just MTU, > how I debug it? You can try changing the MTU of all systems in the broadcast domain. I would just change drivers though, see below. > Bridge configuration: > Linux 2.4.26 ( kernel built in bridge function) > Eth0 RTL8139 driver > Eth1 Intel e100 NIC with eepro100 driver Aha, eepro100 is your problem. > but I cannt use the e100 card with the e100 driver( from both Linux > 2.4.26 and Intel site e100-3.2.3), so I only use eepro100 driver. Why can't you use the e100 driver? Doesn't it recognize your card? The eepro100 driver specifically does not handle oversized VLAN packets without a patch, while the e100 driver does. > How I can use the e100 with e100 driver? Can I use e100 and e1000 > together( use them as eth0,1)? Yes. That will work. //Peter