[SunHELP] Problem with TCP socket connections

Tue Jul 16 05:16:36 CDT 2002

The TIME_WAIT interval is part of the TCP protocol (as stated in the related
RFC).

However, the delay is tunable via the tcp module variable
"tcp_close_wait_interval" (use ndd or /etc/system).
The default value is 240000 ms (4 minutes), so you can adjust the value.

# ndd -get /dev/tcp tcp_close_wait_interval
240000

There is good documentation on this on docs.sun.com (search for "Solaris 8
Tunable Parameters").

---
Sebastien DAUBIGNE
sdaubigne at bordeaux-bersol.sema.slb.com <mailto:sebastien.daubigne at sema.fr>
- (+33)5.57.26.56.36
SchlumbergerSema - SGS/DWH/Pessac

-----Message d'origine-----
De:	jh [SMTP:jh at r2r.de] <mailto:[SMTP:jh at r2r.de]>
Date:	mardi 16 juillet 2002 10:03
:	sunhelp at sunhelp.org <mailto:sunhelp at sunhelp.org>
Objet:	[SunHELP] Problem with TCP socket connections

Hello,

I have a problem with socket connections that keep hanging around in the
system although the connection has been correctly closed.
Suppose I open the server port localhost:1000 and listen for incoming
connections.
Then, I connect from localhost:2000 to that port.
'netstat -f inet' shows that the connection has been established.
After closing the connection, netstat still shows it for some minutes with
the state TIME_WAIT. I cannot reconnect with exactly the same port numbers
as long as this connection is still in the list.
I see the same effect with any TCP connection (e.g. telnet, ftp), however,
with these protocols, the client uses a different client port for each
connection, so there is no problem with old connections.
Does anybody know how to treat these hanging connections, I mean, how can I
determine how long I have to wait? Is there a system parameter for this?
				Thanks for help,
				Jens

______________________________________________

Jens Hamann
Unix Consultant

R2R Informations- und Kommunikations AG
Anzengruberstr. 12    D-83101 Rohrdorf
Tel: +49-8032-9899-0 Fax: +49-8032-9899-29
http://www.r2r.de <http://www.r2r.de>      mailto:jhamann at r2r.de
<mailto:jhamann at r2r.de>
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