Ethereal-users: RE: [Ethereal-users] Please Assist.

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From: "Marco Rommelse" <m.rommelse@xxxxxxxxx>
Date: Fri, 27 Feb 2004 19:14:20 +0100
Hi,

I agree that host B shouldn't reset de connection. After all, host B is
setting up the connection. Host B isn't running a firewall of somekind?

A tcp reset always has a window-size of 0. Ethereal appearently only looks
at the window-size for that diagnostic matter.

Greetings,

Marco

> -----Oorspronkelijk bericht-----
> Van: ethereal-users-bounces@xxxxxxxxxxxx [mailto:ethereal-users-
> bounces@xxxxxxxxxxxx] Namens Andy Low
> Verzonden: donderdag 26 februari 2004 9:45
> Aan: ethereal-users@xxxxxxxxxxxx
> Onderwerp: [Ethereal-users] Please Assist.
> 
> Hi,
> 
> Hope that someone can assist.
> 
> I have 3 hosts (host A, host B and host C). Host A is running some kind of
> service at port 2000 and we suspect that the service lock certain files
> and
> do not allow Host B to access. Host C is scheduled to download the same
> files from Host A daily.
> 
> All the while, Host B has no problem connecting to Host A port 2000 except
> when timing coincides with Host C downloading time.
> 
> I have used Ethereal at the scheduled time when Host C download data from
> Host A and the result is below:
> 
> 1) Host B --> Host A,    src port:1878    dst port: 2000
> [SYN]    Seq=0    Ack=0    Win=16384    Len=0    MSS=1460
> 
> 2) Host A --> Host B,    src port: 2000,    dst port: 1878
> [SYN, ACK]    Seq=0    Ack=1    Win=8192    Len=0    MSS=536
> 
> 3) Host B --> Host A,
> [TCP ZeroWindow]    src port:1878    dst port:2000    [RST]
> Seq=1    Ack=1576600895    Win=0    Len=0
> 
> If Host A lock the files ( I guess), why Host B sent RST packet to Host A?
> Shouldn't Host A reject the connection? It seems like Host B initiate the
> termination. Does it mean the problem is at Host B. Is RST packet always
> go
> with TCP ZeroWindow?
> 
> Hope I am clear with my explanation.
> 
> Thanks,
> 
> Andy
> 
> 
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