Date: Tue, 11 Jul 1995 08:49:09 -0400 From: Gene Stark <gene@starkhome.cs.sunysb.edu> To: Michael Smith <atrad.adelaide.edu.au!msmith@sbstark.cs.sunysb.edu> Cc: questions@freebsd.org Subject: Re: PPP and demand start Message-ID: <199507111249.IAA09799@starkhome.cs.sunysb.edu> In-Reply-To: Michael Smith's message of Tue, 11 Jul 1995 09:57:50 %2B0930 (CST) References: <3tsr1d$7km@starkhome.cs.sunysb.edu>
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>What you probably want is for the link not to drop while you have a TCP >connection open on a remote system. Unfortunately, it's impossible >to detect this, as an open TCP connection normally only generates >traffic (which can be detected) when it's doing something. Nontrivial, but not impossible. The PPP process can track the state of the TCP connection, as it has access to all the packets in both directions. The "dp" package that runs on Sparc's does this, though the dp-2.3 version I have used is not totally reliable in this respect. The PPP process under FreeBSD does not do this type of thing, but it could if somebody coded it. - Gene Stark
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