Re: TCP stalls in 2.0.33 and 2.1.x

David S. Miller (davem@dm.cobaltmicro.com)
Wed, 18 Mar 1998 05:19:38 -0800


Date: Thu, 19 Mar 1998 00:16:22 +1100
From: Richard Gooch <rgooch@atnf.CSIRO.AU>

The MTU on my SLIP link is 255. I'll check tomorrow what the CISCI
terminal server is set to, but I think it should be higher than
that. Would that cause a problem?

SunOS Advertised an MSS of 1460 (ethernet frame size) this must mean
it belives the Linux box is on the local subnet and also connected to
the same ethernet segment. SunOS doesn't implement path-MTU
discovery. So it sent the full sized frames.

So the conclusion I'm at right now is that either:
1) the CISCO is dropping the packets completely, or...
2) the CISCO is not fragmenting them correctly, or...
3) the Linux box is not un-fragmenting them correctly, or
just plain not receiving them at all

And as usual, this could be yet another VJ compression bug of some
sort at either the CISCO or the Linux box.

Later,
David S. Miller
davem@dm.cobaltmicro.com

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