: transfer rates are on the order of 300-600K/sec. An Asante hub
: connects these segments. When I use any other hub the problem
: disappears. I have tried isolating the segments, moving the segments,
: moving servers to other segments. Nada. I have contacted Asante about
: this and they have not had the time to set up a test. If any one else
: has a similar setup, I would be curious if you are having any similar
Check the error rates on the SCO end with:
If it's a managed hub with SNMP, telnet into the box and watch
the numbers pile up. Also, do some traffic analysis even if
means watching the lights flash. If there is lots of traffic
showing but nothing is moving, you have a problem worth of a
I'm going to make a guess that your problem is either:
1. Duplicated IP address somewhere.
2. Overlapping IP address ranges on multiple cards in the SCO
server address space.
3. Misconfigured overlapping broadcast address on the SCO box.
4. Router loop.
5. Hub loop. (multiple hubs connected in a loop).
Every one of these can do amazing things to a network. You
were on the right track by seperating the network segments.
However, that won't work if the cards are misconfigured.
Turn the cards off one at a time with software. Run:
ifconfig net0 down
to turn off an interface. Note that this does NOT disable
routing through this interface so you may need to also run:
route delete whatever_you_have_going
to disarm that monster. Let the server run on only one for
a while and see if it fixes the problem.
Duplicated IP addresses can be found with protocol analyzers.
OSR5 will complain loudly if it finds one. You can also run:
multiple times and look for an IP address with constantly
changing MAC address. This is a bit tedious but effective.
One of my customers is heavily infested with Asante hardware.
Lots of MacIntosh cards, hubs and 10baseT/100baseT switches.
It's good stuff, quite reliable and cheap.
There is also a small chance that the reason the problem
goes away with another hub is that some device (3Com card)
is belching mutilated packets and the Asante hub is more
sensitive than the un-named replacement. This is where
a managed hub or running llistat will show corrupted packets.
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# Jeff Liebermann Liebermann Design 150 Felker St #D Santa Cruz CA 95060
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