Here is what I have learned about the SLIP hangs:
1. They happen about the same whether SMP or UNI kernel.
2. They happen even at 9600baud. But, the hangs are less frequent
as the baud rate is reduced.
The way I forced 9600baud was to set one moden so that its max
and min baud rates were both 9600b. I think this prevented
any speed negociation even though the modem at the far end was
not constrained. The USR documentation on retraining is vague
to put it mildly.
I did baud rates of 31200, 26,400, 21,600 and 9600 for both
SMP (2.1.123) and UNI(2.1.126).
My conclusion from this is that it is more likely that there
is a hang/timeout somewhere in the SLIP handling rather than
a modem problem. I have new (56k) USR modems on order in any
case and will replace the current modems when they arrive.
Anything else I can do?
---Michael
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