--On Thursday, January 09, 2003 12:38:58 +0100 Rogier Wolff
<R.E.Wolff@BitWizard.nl> wrote:
> On Wed, Jan 08, 2003 at 02:08:50PM +0100, Wichert Akkerman wrote:
>>
Looked normal and then:
>
>> 13:57:40.282351 2001:968:1::2.8000 > tornado.wiggy.net.33035: .
>> 9359225:9360433(1208) ack 1 win 5712 <nop,nop,timestamp 369670744 846103>
>
> But now: No ack! Funny.
Might be SACK deciding not to...
>> 13:57:40.284307 2001:968:1::2.8000 > tornado.wiggy.net.33035: .
>> 9360433:9360653(220) ack 1 win 5712 <nop,nop,timestamp 369670744 846103>
>
> Another packet, no ack!
>
>> 13:57:40.297307 2001:968:1::2.8000 > tornado.wiggy.net.33035: .
>> 9360653:9361861(1208) ack 1 win 5712 <nop,nop,timestamp 369670745 846104>
>> 13:57:40.297376 tornado.wiggy.net.33035 > 2001:968:1::2.8000: . ack
>> 9359225 win 32616 <nop,nop,timestamp 846111 369670744,nop,nop,sack sack
>> 1 {9360653:9361861} >
>
> Another packet, but this time it SACKs the just-recieved packet. It looks
> as if the two packets inbetween somehow were not recognized as belonging
> with this connection.
or SACK forgot about them?
> Two more packets, and still more hints towards the other machine that
> we're missing 9359225-9360653
>
>> 13:57:40.568652 2001:968:1::2.8000 > tornado.wiggy.net.33035: .
>> 9359225:9360433(1208) ack 1 win 5712 <nop,nop,timestamp 369670773 846113>
>
> So, it retransmits the first. but we don't see it as beloging to
> this connection or something, so it gets ignored.
or we're waiting for the other one to ACK them both in one go?
> It looks as if somehow those two packets 9359225:9360433 and
> 9360433:9360653 get mangled in a way as to invalidate the checksum. This
> would cause "silent drop" of these packets before they were acked....
Could be data dependant, so there's a pattern in the packet contents that
causes this?
> Can you check the stats counters, to see if they are indeed dropped?
>
> Roger.
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This archive was generated by hypermail 2b29 : Wed Jan 15 2003 - 22:00:27 EST