The NetBSD 'tl' driver is sending a "LLC Test Packet" apparently.
Look at /sys/dev/pci/if_tl.c and search for 'LLC' if you want to see it.
Apparently it is sent if the interface has been idle for a certain
amount of time.
I'm sure you could comment that section out if you want.

-Andrew

On Sat, Jun 23, 2001 at 01:45:50PM -0400, Sean Davis wrote:
> I'm running NetBSD-current/i386, using a Compaq Netelligent dual port
> ethernet card, and for some reason the interface is sending some strange
> packets at a steady rate (tcpdump output follows) and I cannot figure out
> what they are nor why they are being sent. The dmesg output from the
> ethernet adapter is:
>