Date: Sun, 28 Sep 1997 04:58:32 +0100 From: Brian Somers <brian@awfulhak.org> To: Chris <chris@ferraro.net> Cc: questions@freebsd.org, brian@awfulhak.org Subject: Re: PPP problems Message-ID: <199709280358.EAA09830@awfulhak.demon.co.uk> In-Reply-To: Your message of "Sat, 27 Sep 1997 20:48:11 EDT." <Pine.BSF.3.96.970927204353.9653A-100000@athena.ferraro.net>
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> On Sat, 27 Sep 1997, Brian Somers wrote:
>
> > > Occasionally, PPP traffic just stops. PPP won't pass any traffic. The
> > > routing tables do not change. The problem occurs randomly. Outgoing ping
> > > traffic simply is not returned, but does not return a message (ie. no
> > > route to host). I can ping other systems on my local network and myself
> > > without problems.
>
>
> I have noticed that it occurs much more often under high traffic, when the
> traffic is traveling to many different sites/addresses.
>
>
> > [perfectly fine routing table deleted]
> >
> > Does the connection close ?
>
> No, I am sure the line is still active.
Would you be able to use ``ktrace'' (use the -p switch to attach to
the running ppp) when this is happening ? I'd be interested to see
what ppp thinks it's doing at the time :-|
> > I've seen ppp doing this once or twice, for no reason. Everything
> > seems to "hang", and a short while later things are fine again. I
> > haven't treated it as a potential problem yet 'cos I consider such
> > things to be potential "glitches" with my ISP.
> >
> > If it's happening reasonably consistently for you, you'll need to
> > diagnose it a bit more - there are instructions now in section 10 of
> > the FAQ on how to do this.
>
> I was unable to find anything about diagnosis under section 10 of the FAQ
> on www.freebsd.org. Of course, I could easily have missed it.
Section 10.7 - I can't make ppp work. What am I doing wrong ?
> No traffic is going out the link. I determined this by sending ping
> packets to a Win95 machine that was connected to the Internet. I was able
> to ping it and watch the green modem light light when I was not having a
> problem. Then I waited until the link wasn't functioning and pinged the
> Win95 system again. The modem lights stayed red, indicating no activity.
>
> However, if I attempt to access a web page on my system from another
> Internet connected computer, I see the IP in the netstat -n output
> with the words "SYN_SENT" next to it. The status never changes to
> ESTABLISHED. This seems to indicate that traffic is entering the link.
Hmm, a kdump is definitely in order. You may want also to verify that
your routing table (netstat -rn) is the same when the link is working
as when it's not.
> I just tried to upgrade to the Sept 24th release of PPP, but I couldn't
> get it to compile
>
> I ended up with:
>
> ld: -ldes: no match
> *** Error code 1
>
> Stop.
> *** Error code 1
>
> Stop.
Ppp checks for the existence of /usr/include/des.h in the Makefile,
and builds in MSChap if it's found. MSChap uses -ldes. Have you got
des.h and no libdes.a (or libdes.so.*) in /usr/include/. ?
> >
> > You'll probably need to "set log +tcp/ip" in addition, but you only
> > need do this while the connection is "pausing". Set yourself up a
> > script:
> >
> > #! /bin/sh
> > val=+
> > test ."$1" = .off && val=-
> > exec pppctl -p mypasswd 3000 set log ${val}tcp/ip
>
> I tried using this script, but I couldn't figure out where the logging
> information went. I check /var/log/messages, but there is nothing
> indicating any logging is taking place.
Check the man page. It's controlled by sysctl (in /etc/
syslogd.conf). Search for syslog in the man page and you'll find a
sample entry.
If ppp completes building and installing, it suggests that this is
one of the things you may have to change :-)
> > You can then find out if the traffic is actually going out or not.
> > Of course if you have an external modem, you can probably just look
> > at the TX light.
>
> I have an internal modem.
Oh well :-|
[.....]
> Thank you,
>
> Chris
>
--
Brian <brian@Awfulhak.org>, <brian@FreeBSD.org>, <bri@OpenBSD.org>
<http://www.Awfulhak.org>;
Don't _EVER_ lose your sense of humour....
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