Re: linux-vxworks networking problem

From: Tony Hoffmann (tony.hoffmann@nrc.ca)
Date: Thu Apr 06 2000 - 16:43:59 EST


Tim Waugh wrote:

> On Thu, 6 Apr 2000, Tony Hoffmann wrote:
>
> > We are having some bizarre behaviour getting some distributed
processing
> > working between Linux and VXWorks.
>
> Can you send a tcpdump trace of this?
>
> Tim.
> */
>
> -
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Here is an example dump of a normal, working message:

09:40:29.556322 IF-micro.drao.nrc.ca.1030 > beowulf.21319: .
171397:172857(1460) ack 769 win 8192
09:40:29.556369 IF-micro.drao.nrc.ca.1030 > beowulf.21319: P
172857:173337(480) ack 769 win 8192
09:40:29.556778 beowulf.21319 > IF-micro.drao.nrc.ca.1030: P 769:777(8)
ack 173337 win 65160 <nop,nop,timestamp 101010715 3444> (DF)
09:40:29.557429 beowulf.3462 > IF-micro.drao.nrc.ca.21319: P
26025:26313(288) ack 721 win 65160 (DF)
09:40:29.569454 IF-micro.drao.nrc.ca.21319 > beowulf.3462: P 721:729(8)
ack 26313 win 8192

This is just repeated over and over until I get something like this:

09:40:29.570979 beowulf.3461 > IF-micro.drao.nrc.ca.21319: . ack 49 win
65160 (DF)
09:40:29.571189 IF-micro.drao.nrc.ca.1030 > beowulf.21319: P
174797:175277(480) ack 777 win 8192
09:40:29.571261 beowulf.21319 > IF-micro.drao.nrc.ca.1030: . ack 173337
win 65160 <nop,nop,timestamp 101010717 3444> (DF)
09:40:29.580977 beowulf.3462 > IF-micro.drao.nrc.ca.21319: . ack 729 win

65160 (DF)
09:40:30.902887 IF-micro.drao.nrc.ca.21319 > beowulf.3461: P 41:49(8)
ack
529 win 8192
09:40:30.902926 beowulf.3461 > IF-micro.drao.nrc.ca.21319: . ack 49 win
65160 (DF)
09:41:33.404075 IF-micro.drao.nrc.ca.1030 > beowulf.21319: .
173337:174797(1460) ack 777 win 8192
09:41:33.404742 beowulf.21319 > IF-micro.drao.nrc.ca.1030: P 777:785(8)
ack 175277 win 65160 <nop,nop,timestamp 101017100 3444> (DF)
09:41:33.405407 beowulf.3462 > IF-micro.drao.nrc.ca.21319: P
26313:26601(288) ack 729 win 65160 (DF)
09:41:33.405674 IF-micro.drao.nrc.ca.21319 > beowulf.3462: . ack 26601
win
7936
09:41:33.406635 IF-micro.drao.nrc.ca.21319 > beowulf.3462: P 729:737(8)
ack 26601 win 8192

And after that it goes back to the normal messages until it pauses
again.

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