abstine@sun.soe.clarkson.edu (Arthur Stine) (02/09/89)
I am having problems with a DEMPR attached to a Chipcom 8023 broadband modem. Every few hours, it seems to be jamming up and ends up crashing or hanging the stuff which is attached to the one thinwire segment attached to the dempr (a couple VAXstation-2000's, PCs, etc). SQE is turned off on the 8023, but currently local AUI echo is turned on. I am unsure whether this causes a problem. For the period of time up to the jam, there appear to be no problems with the net (no excessive collisions, mis-aligned packets, etc). The situation is somewhat complicated by having a DELNI attached to the 8023 via its network port. Prior to attaching the DEMPR, everything worked fine. The only thing that appears to pick up this 'jam' is the dempr. the thinwire line was previously attached via a pair a DEREP-RC's with a short section of fiber and while attached to the DEREP's, the thinwire never experienced this problem. Does anyone have experience with DEMPR's in this sort of config? any pointers or insight? art stine sr network engineer clarkson u
haas@wasatch.UUCP (Walt Haas) (02/10/89)
In article <2440@sun.soe.clarkson.edu>, abstine@sun.soe.clarkson.edu (Arthur Stine) writes: > I am having problems with a DEMPR attached to a Chipcom 8023 broadband > modem... The situation is somewhat complicated by having a DELNI attached > to the 8023 via its network port... Feeding a DELNI into a Chipcom modem is a violation of the configuration rules because the DELNI generates runt packets. The broadband doesn't deal with runt packets very well unfortunately. Something like the LANbridge or equivalent must be used to filter runt packets. This might be part of the problem. Cheers -- Walt Haas haas@cs.utah.edu utah-cs!haas