*BSD News Article 73566


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From: tedm@agora.rdrop.com
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: User PPP connection is s......l......o.......w......!
Date: 13 Jul 1996 08:50:58 GMT
Organization: Symantec Corporation
Lines: 22
Message-ID: <4s7o1i$m3a@symiserver2.symantec.com>
References: <01bb6e37.014cfd20$38673fcb@simonh.addease.com.au> <4s1g7h$fr@anorak.coverform.lan> <4s3ul6$h0c@godzilla.zeta.org.au>
Reply-To: tedm%toybox@agora.rdrop.com
NNTP-Posting-Host: 198.6.34.1
X-Newsreader: IBM NewsReader/2 v1.2

In <4s3ul6$h0c@godzilla.zeta.org.au>, bde@zeta.org.au (Bruce Evans) writes:
>In article <4s1g7h$fr@anorak.coverform.lan>,
>Brian Somers <brian@awfulhak.demon.co.uk> wrote:

[big long discussion of a possible solution and why it is wrong deleted]

OK, but we didn't solve his problem. ;-)

I'd check two things in PPP.  First, the MTU.  While this is supposed to be
auto-negotiated by the protocol, unfortunately some PPP servers are better
than others at implementing the PPP standard.  This should be available from the
server logs, etc.  Second, check to see if header compression is enabled.

Last, if you have an external modem, look at the SD/RD lights under both
connections.  On an FTP transfer from a nearby server, you want almost a
solid RD light, with a few SD flickers to indicate outgoing ACKS.  If both are
dancing all over the place, perhaps the client is too slow sending out ACKS,
which could be caused by many things.  The point is that you should have
similar patterns.

Unfortunately, troubleshooting using external modem lights seems to be a dying
art, but it's definitely worth practicing.