Telnet Disconnects - Please help!

[Harald Milz]

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 at yosemite.net
> To: ubuntu-users at lists.ubuntu.com
> 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
> 
> -- 
> ubuntu-users mailing list
> ubuntu-users at lists.ubuntu.com
> Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-users

_________________________________________________________________
E-mail for the greater good. Join the i’m Initiative from Microsoft.
http://im.live.com/Messenger/IM/Join/Default.aspx?source=EML_WL_ GreaterGood