FreeBSD 6.0-RELEASE+Dummynet+Bridging

[John B. Wood]

Hello, all.  I am running the subject software on a Dell Dimension 3000 
desktop with two Ethernet interfaces (using the em and fxp drivers).  
The kernel modules that are being used are dummynet.ko, ipfw.ko, and 
if_bridge.ko.  After setting up the pipes, etc. the platform runs as 
expected doing its bridging and desired dummynet traffic shaping 
function but consistently crashes the platform after about 15 minutes 
requiring a power off/on restart (or logging in on a virtual terminal 
and issuing a shutdown).  If I just do bridging with IPFW but without 
dummynet.ko loaded everything is fine.  The same behavior results if I 
recompile the kernel to support firewalling and dummynet.

I am consistently obtaining what appears to be a FIFO overrun (kernel: 
em0: Rx overrun).

I also tried all this with an IBM T22 Thinkpad (internal + PC Card 
Ethernet interfaces) and got the same result.  Has anyone had a similar 
experience and found a fix?  Thanks for your time and comment.  Sincerely,

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