Date: Wed, 18 Aug 1999 19:10:29 +0100 From: Brian Somers <brian@Awfulhak.org> To: Rowan Crowe <rowan@sensation.net.au> Cc: freebsd-isp@FreeBSD.ORG Subject: Re: Minor prob with user level ppp - multilink Message-ID: <199908181810.TAA05472@keep.lan.Awfulhak.org> In-Reply-To: Your message of "Thu, 19 Aug 1999 02:54:25 %2B1000." <Pine.BSF.4.01.9908190252440.15409-100000@velvet.sensation.net.au>
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>
> Hi all,
>
> Still having a slight problem with multilink under userland PPP... if one
> of the modems goes down momentarily, no packets get through (even though
> the other modem is still up). Is this normal? I would have thought that a
> link dropping should be no sweat, just revert to the remaining links...
If the link is closed cleanly, there should be no interrupt in the
data stream. If a link is lost, the data queued for that link (at
most one packet in user-ppp) will be dropped as soon as ppp realises
that the link is dead. With correct carrier, this is immediate, but
the gap in the data stream will cause difficulties if
1. The peer doesn't realise that the link is down (carrier
detection problems). It ends up waiting for the missing data.
2. You're using compression. Here, both sides have to resync
their dictionaries. This can take some time.
Apart from that, the missing data is just ``missing data'' and the
above layers will deal with it as they see fit.
If you're using user-ppp on both ends, create a diagnostic socket and
use ``show mp'' to see when ppp is waiting for unreceived information.
> Cheers.
>
>
> --
> Rowan Crowe http://www.rowan.sensation.net.au/
> Sensation Internet Services http://www.sensation.net.au/
> Melbourne, Australia Phone: +61-3-9388-9260
--
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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