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