> Date: Mon, 28 Sep 1998 07:21:58 -0700 (PDT)
> From: "Geoff L. Kennedy" <[EMAIL PROTECTED]>
> To: David Ready <[EMAIL PROTECTED]>
> cc: Linux PPP Mailing list <[EMAIL PROTECTED]>
> Subject: Re: Stop Looking!! Re: News Clients When Dialed Up To PPP?
> On Mon, 28 Sep 1998, David Ready wrote:
> > Hi All.
> G'day !
> > I found the problem!!! Thanks to Microsoft's NT network analyser. It was the
> > MTU 542 size that I had in options. For some reason news servers can't cope
> > with a connection setup with an MTU. Just put a "#" in front of it in
> > options and all is now well.
> Maybe it just doesn't like 542.....I thought that MTU sizes are calculated
> by the formula (N * 128) + 40, where N is an integer. Going by this,
> perhaps 552 is what you need.
> Or am I "out to lunch" here ?? 8-)
Waiter! Check please... ;-)
Seriously, I don't think this is it. The IP MTU is supposed to be
576 bytes or longer, and for PPP up to 1500 bytes. More than 1500
is asking for trouble. Other than that, it should be a multiple of
4, since the IP packet length field encodes the length as 4 byte
words... And will pad for anything not word aligned.
The 576 comes from 512 bytes of layer-3 payload, plus a full 64 bytes
of IP header (i.e. with options).
> I'm using 552 here, and haven't had any problems......
-Philip
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