RE: Telnet Disconnects - Please help!


Hi Mike,

I have no firewall on the laptop. But I will try to set up a private network today to test this out. I hope I am able to reproduce the issue as I will have no network delay. The last time I had 1ms network delay everything worked just fine.

I would go for the TCP bug, because this issue is not present on windows.

KR, Harald
----------------------------------------
From: mgb-ubuntu@xxxxxxxxxxxx
To: ubuntu-users@xxxxxxxxxxxxxxxx
Subject: Re: Telnet Disconnects - Please help!
Date: Sun, 25 May 2008 10:05:09 -0700

On Sun May 25 2008 03:32:27 Harald Milz wrote:
I know the PNG with the filtered pcap doesn't seem that complete, but
Bertelsmann has a very strict policy about data privacy, so I am unable to
post the complete pcap.

The first packet displayed already has a zero window. We need to
determine why. Without that information we can only guess.

For example, something may be blocking ICMP packets necessary for
the router to discover the PMTU. If this were the case, full-size
packets would never reach the laptop but smaller packets would
arrive, causing Ubuntu to sit with a full window and repeatedly
ack in order to try to stimulate the retransmission of the missing
packets.

If this is the case (and ICMP blocks are a common mistake) the bad
filter could be anywhere between the router and the T61 inclusive.
If it only happens in Ubuntu but not Windows on the same laptop,
I'd check the laptop's firewall first.

However, the pattern of incrementing acks without data from the
router would (if confirmed by the totality of the data stream)
suggest some kind of TCP bug.

--Mike Bird

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