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To: mike@sentex.net, rwatson@freebsd.org
Date: Mon, 8 Nov 2004 21:44:40 +0200 
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cc: freebsd-current@freebsd.org
cc: mib@wnet.ua
Subject: Re: em0, VLAN and bpf(?) trouble w/RELENG_5
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Dear Mike, dear Robert,

Yes, that's exactly what happens here. It also starts sending again in a
while.

Also my collegue reported, that vlan0 link has problem with transporting
long (> MTU, which is set to 1500) packets. He also reminded me that the
very same kind of problem was fixed some time ago in Linux driver for same
hardware.

Tomorrow, when I'll get a physical access to the box, I will try to move all
the setup and routing to fxp0 interface and see what happens.

WBR,
Andrew

> At 11:16 AM 08/11/2004, Robert Watson wrote:
> 
> >(1) If you run tcpdump on the em0 interface itself, does the 
> > same thing happen?
> 
> I can easily reproduce this.  The first tcpdump works fine.  
> But when you 
> stop dumping, no packets come through.  Start the tcpdump on 
> em0 and then 
> stop it works.  Then start it again on em0, the flow stops, 
> even though 
> tcpdump says the NIC is forwarding.  Stop the dump and 
> packets flow normal. 5.3-STABLE FreeBSD 5.3-STABLE #0: Fri Nov  5
...
> It seems to be sending it back, but its not.  Soon as I end 
> the tcpdump, it starts sending again.  This is a test setup, so I can
crash / 
> test whatever you like.