From owner-freebsd-hackers@FreeBSD.ORG  Sat Aug  5 15:51:25 2006
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Date: Sat, 5 Aug 2006 08:51:23 -0700
From: Luigi Rizzo <rizzo@icir.org>
To: Joao Barros <joao.barros@gmail.com>
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	from joao.barros@gmail.com on Sat, Aug 05, 2006 at 12:42:12AM
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Cc: freebsd-hackers@freebsd.org, Gleb Smirnoff <glebius@freebsd.org>
Subject: syslog bug ? (was Re: [PATCH] add header "pppoe:" in ng_pppoe.c
	printfs)
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On Sat, Aug 05, 2006 at 12:42:12AM +0100, Joao Barros wrote:
...
> I patched and recompiled the kernel.
> After booting I notice that no messages from ppp are logged by syslog
> (messages|ppp.log)

What is your OS version ?

i hit a similar problem some time ago, and it seems that
the syslog client code remembers any error on the socket
(e.g. ICMP host/port unreachable messages) and does not
retry afterwards (or for some time, or there is some bug
in handling the error condition).
I am a bit fuzzy on the details because
this was some 3 years ago on a 4.x client.

Your problem is likely because ppp starts before the syslog daemon,
the initial message fails and then you get nothing anymore.

the vsyslog code in 6.x (libc/gen/syslog.c) is slightly different
from the one in 4.11.

cheers
luigi