Date: Wed, 28 Jul 1999 09:45:31 +0100 From: Brian Somers <brian@FreeBSD.org.uk> To: hm@hcs.de Cc: brian@FreeBSD.org.uk (Brian Somers), garyj@muc.de, pherman@element-5.de, Dirk.Nerling@pdv.de, freebsd-isdn@FreeBSD.ORG Subject: Re: can somebody explain me the followings dial / never disconnects? Message-ID: <199907280845.JAA01087@keep.lan.Awfulhak.org> In-Reply-To: Your message of "Wed, 28 Jul 1999 08:34:17 %2B0200." <m119NIA-0000GMC@hcswork.hcs.de>
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> >From the keyboard of Brian Somers: > > > > Anyway, in i4b still all packets reset the idle timer whereas this must > > > be changed to a behaviour that only IP packets reset the idle timer. > > > > I don't think this is right. IMHO i4b should implement the idle timer > > as it currently does and should not understand ppp frames. If > > there's a ppp layer running on top of the i4b device, that's where > > the idle timer that ignores ECHO requests (or whatever) should be. > > Ok, i was unclear. Currently, every packet resets i4b's idle timer, so > as long as there are echo requests, it will never timeout and so the > line will stay open forever. > > What i think of is a sort of callback from isp (the "physical device") > to sppp (the PPP machine), where sppp is able to say "this is a packet > which carries data (IP packets), please reset the idle timer" or "this > is a packet which is not relevant to the idle timer (LCP Echo etc.), > please do not reset the idle timer". > > This way i4b knows nothing about packet contents, the knowledge goes > into sppp (which should know all about PPP) but they both can communicate > about the content of a packet with regard to resetting the idle timeout > mechanism. > > Does this sound better ? Absolutely. In the case of sppp, this is definitely the best solution. However, a facility to dynamically control the idle timer may still be required in the future. For MP implementations, there should be a single idle timer for the whole bundle. This requires that the timer be implemented at the ppp level where it knows when the last NCP packet was sent/received on *any* link. > hellmuth > -- > Hellmuth Michaelis Tel +49 40 559747-70 > HCS Hanseatischer Computerservice GmbH Fax +49 40 559747-77 > Oldesloer Strasse 97-99 Mail hm [at] hcs.de > 22457 Hamburg WWW http://www.hcs.de -- 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> To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isdn" in the body of the message
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