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From: hedrick@cs.rutgers.edu
Newsgroups: comp.dcom.sys.cisco
Subject: Re:  KeepAlives and half duplex failures
Message-ID: <19503@boulder.Colorado.EDU>
Date: 10 Apr 90 11:51:55 GMT
Sender: daemon@boulder.Colorado.EDU
Lines: 2

To see exactly how keepalives work, try "debug serial".  This will
show the serial numbers going both ways.