Date: Tue, 20 Jul 1999 02:01:35 +0100 From: Brian Somers <brian@Awfulhak.org> To: Christoph Sold <cs@cheasy.de> Cc: Brian Somers <brian@Awfulhak.org>, Questions@FreeBSD.ORG Subject: Re: PPP RecvEchoReply -- how to keep them off my line? Message-ID: <199907200101.CAA64954@dev.lan.awfulhak.org> In-Reply-To: Your message of "Fri, 16 Jul 1999 00:30:14 %2B0200." <14222.23490.942879.3347@kiste.cheasy.de>
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> Brian,
>
> thanks fro the fast response.
>
> Brian Somers writes:
> > > Hi Folks,
> > >
> > > apologies for asking a FAQ, but I could not find it in the
> > > (3.1-R) Handbook solved.
> > >
> > > Looking through /var/log/ppp.log while dialed into one of my
> > > ISPs, every 10 seconds a packet crawls through the line:
> > > ---<snip>---
> > > Jul 14 23:20:27 kiste ppp[1967]: tun0: LCP: deflink: RecvEchoRequest(34) state = Opened
> > > Jul 14 23:20:27 kiste ppp[1967]: tun0: LCP: deflink: SendEchoReply(34) state = Opened
> > > Jul 14 23:20:37 kiste ppp[1967]: tun0: LCP: deflink: RecvEchoRequest(35) state = Opened
> > > Jul 14 23:20:37 kiste ppp[1967]: tun0: LCP: deflink: SendEchoReply(35) state = Opened
> > > ---<snip>---
> > >
> > > Annoyingly, this keeps the connection from timing out. Is this a
> > > ppp feature I can deny?
> >
> > You can't deny it - sending the reply is mandatory (well, nearly -
> > from memory, ppp *MAY* decide not to send the packet, but if it gets
> > a repeat REQ, it *MUST* reply).
>
> Too bad. I realize this happens on ppp level, where IP filtering is
> not able to kill the beast.
>
> > This should *not* refresh the idle timer though. Does ``show b'' say
> > otherwise (with ``set log +hdlc lcp phase'' showing if traffic is
> > arriving) ?
>
> Ummm, I´m out of my depth here: looking at /var/log/ppp.log, some data
> scrolls by. After that, the idle timer gets reset. I included the data
> for your reference.
>
> Maybe there is other data hidden in there as well -- I cannot
> say.
>
> Thanks for your fast response
> -Christoph Sold
>
> P.S: I leave town for the weekend, so if I should look for anything else,
> please be patient -- I´ll be back Tuesday evening.
[.....]
Oops. I should have included tcp/ip logging in my suggestion... As I
don't see any LCP messages about ECHO REQ/Response packets, I can
only assume that all that data was IP traffic (and hence resets the
timer). The tcp/ip logging should show this - maybe you need to
filter some of it....
--
Brian <brian@Awfulhak.org> <brian@FreeBSD.org>
<http://www.Awfulhak.org>; <brian@OpenBSD.org>
Don't _EVER_ lose your sense of humour ! <brian@FreeBSD.org.uk>
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