Re: TCP stalls in 2.0.33 and 2.1.x
Richard Gooch (rgooch@atnf.CSIRO.AU)
Thu, 19 Mar 1998 08:23:06 +1100
David S. Miller writes:
> 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.
OK, so what steps should I take to test this? How about a tcpdump on
machine A (local router) when ftp'ing from the SunOS box, and when
sending these UDP packets?
Regards,
Richard....
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