RE: [Released] [Contains offensive content] RE: Building Network Redundancy into a Perl Client

From: Graeme St. Clair (Graeme.St.Clair_at_hds.com)
Date: 12/07/04 

To: "'Joshua Berry'" <jberry@PENSON.COM>, Jim <jkipp5@comcast.net>
Date: Mon, 6 Dec 2004 15:09:50 -0800

Does anyone know why or where the phrase [Contains o f f e n s i v e
content] is being inserted into these headers? I wouldn't care, except my
employer's spam filter is holding them up for whatever reason, as it might
be, use of the said phrase...

Rgds, G.

-----Original Message-----
From: Joshua Berry [mailto:jberry@PENSON.COM]
Sent: Monday, December 06, 2004 10:01 AM
To: Jim
Cc: beginners@perl.org
Subject: [Released] [Contains offensive content] RE: Building Network
Redundancy into a Perl Client

I don't think that it is possible to do within perl so I had to enable these
options:

echo 1 >> /proc/sys/net/ipv4/tcp_tw_reuse echo 1 >>
/proc/sys/net/ipv4/tcp_tw_recycle

-----Original Message-----
From: Jim [mailto:jkipp5@comcast.net]
Sent: Saturday, December 04, 2004 8:27 PM
To: Joshua Berry
Cc: beginners@perl.org
Subject: RE: Building Network Redundancy into a Perl Client

> I am trying to implement redundancy in a client application that I am
> writing so that I can have a primary server and a backup server. The
> client is tailing a logfile and sends results to a server for
> processing, at the end of the tail loop it sends data to a function
> that tries to establish a connection to the primary server and send
> the data, if that fails then the data is sent to the backup (failover)
> server.
> The way the function works, if the primary comes back online then it
> automatically knows and starts sending data back to the primary.
>
> The only problem with the way this is implemented is that every
> connection remains for a couple of minutes in the TIME_WAIT stage:
>
> tcp 0 0 xxx.xxx.xxx.xxx:xxx xxx.xxx.xxx.xxx:xxx
> TIME_WAIT
> tcp 0 0 xxx.xxx.xxx.xxx:xxx xxx.xxx.xxx.xxx:xxx
> TIME_WAIT
>
> Which adds up if I am sending several connections per minute or
> possibly per second. My question is, is there a way to bypass the
> TIME_WAIT stage or at least reduce the time it is in this stage from
> within the program? Below is the subroutine and how it is called. If
> there is another way of doing this please let me know.

I took a look at socket options ( setsockopt() ) but I don't see anyting
that would change the time_wait timer ,but I didn't look that hard :).
What
OS are you using? You may have tomodify some kernel settings if you are
using UNIX/LINUX. With windows, here are a few links that may help

http://www.winguides.com/registry/display.php/878/

http://www.windowsitpro.com/Web/Article/ArticleID/23276/23276.html 

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