(PM) data dropouts / packet loss

Matthew E. Sloane (msloane@netrax.net)
Mon, 29 Mar 1999 14:43:08 -0500

Problem: At apparently random intervals, our customers will experience a
brief (from 30 sec, to 3 minutes sometimes) loss of throughput. I
reproduced this problem on my home computer and while my TX indicator
will light, the RX will not. Upon cross-referencing the complaints,
there is no discernable pattern to any of the following:

user's modem type/computer/etc.
connect speed
ComOS (have tried from 3.7 to 3.7.2c3 and, on pm3s, 3.8.3)
portmaster type (occurs on both PM2(30)s and PM3s)
POP location (ie, the physical location that the customer dials into)

The only thing in common that I have seen is that they are all dialup
modem (ISDN seems to be working fine) customers connecting to a
Lucent/Livingston portmaster.

Other info:
RIP routing has been set up so that the portmaster is
no_broadcast/listen on the downstream (dialup) side, and
broadcast/no_listen on the upstream (ethernet) side. Thus, anything
going out goes throught the default route, and doesn't have a huge route
list to go through.
Bandwidth doesn't seem to be a problem. We've not peaked at more than
75% on any of our lines (most not even at 50%).

Anyone got any ideas? We've run out of things to try.

--
Matthew E. Sloane
CTI/Netrax
http://www.netrax.net/
mailto:msloane@netrax.net
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