On Tue, 18 Mar 2008, David DeSimone wrote:
Sean C. Farley <[EMAIL PROTECTED]> wrote:
An ICMP test showed that there were occasional pauses and packet
loss. The fix: use 100Mb instead of 10Mb. :) For some reason I do
not recall, I had forced the interface connected to the DSL router to
10Mb. When I noticed XP did not have the same problem and that it
had a 100Mb connection to the router, I found and removed the "media
10baseT/UTP mediaopt full-duplex" from /etc/rc.conf for the
interface. That appears to have fixed it.
The fix here is not that you moved to 100 Mb, it's that you stopped
forcing duplex, and allow auto-negotiation to take place.
With the forced duplex in effect, your NIC does not auto-negotiate
with the other end (the router), and it falls back to half duplex,
which leads to large numbers of collision errors.
Ah! I tried it again at 10Mb without setting it to full-duplex, and it
worked. Out of curiosity, is it normal that 100Mb will default to
full-duplex yet 10Mb will not, or is it dependent on the hardware?
The pause always seemed to be for packets from the router to the
computer.
Yep, whenever the router would try to send, if your end happened to be
sending a frame, the router's NIC would stop to avoid the collision,
leading to packet loss. This is a classic duplex-mismatch scenario.
My wife was getting tired of hearing the thump of my head on the wall.
Maybe one more to make sure I remember this next time. :) Thank you
for the explanation.
Sean
--
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