Hello. I've had a breakthrough on this issue. The problem seems to
be with the wm(4) driver and this particular chip, an 82576 1000-base-T gigabit
chip. If I enable checksum flags the chip stops responding. If I disable
those flags and re-assign the IP address, things come back to life.
Looking to see how all that machinery gets turned on with ifconfig and see
if I can tell where it's breaking. I use these flags all the time with
this driver and other chips without a problem. Perhaps it's been fixed in
the -current driver, but not pulled up to the 5.1 driver. In any case, I'm
glad it's something smaller in scope.
-thanks
-Brian
