Re: strange behaviour in TCP-Connect-Handshake

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Hi,

On Fri, 2 Aug 2002 kuznet@ms2.inr.ac.ru wrote:

> Hello!
>
> > 12:41:27.997216 eth0 < 217.111.11.28.53656 > 10.10.2.10.www: S
> > 1550641618:1550641618(0) win 5840 <mss 1460,sackOK,timestamp 646924298
> > 0,nop,wscale 0> (DF)
> >
> > 12:41:27.997243 eth0 > 10.10.2.10.www > 217.111.11.28.53656: .
> > 281850:281850(0) ack 124 win 32120 <nop,nop,timestamp 88850 648121803>
> > (DF)
>
> You have an old half-open connection, existing only at 10.10.2.10.

I don't understand. I think it must be a new connection. The main problem
is, that when i make a simple "wget" on the proxy it sometimes hangs for
some seconds until it makes a reconnect. I have also tried a simple
"telnet" on the squid-port, which sometimes hangs. And then i have this
strange thing in tcpdump. Normally the telnet should always get the
connect at once, isn't it so?

The next thing is: Why do I have no problems when using a 2.2.20-kernel?
Then, every telnet or wget gets the connection at once.

> > 12:41:27.998085 eth0 < 217.111.11.28.53656 > 10.10.2.10.www: R
> > 1438731713:1438731713(0) win 0 (DF)
> ...
> > What could be the problem?
>
>
> There is no problem. You see standard recovery of half-open
> connection, see rfc792, page 34.

I would like to read it, but i can't find it at www.faqs.org. Are the
numbers correct? rfc792 is about ICMP and only have 20 pages, there is no
page 34.

Thank you very much

Olli

[...]

-- 
Dipl. Inf. (FH) Oliver Joa
senior IT-architect

Gatrixx NetSolutions GmbH
Karl-Goetz-Strasse 5
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E-Mail ojoa@gatrixx.com, ojoa@gmx.net, oliver@j-o-a.de

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