From owner-freebsd-net  Thu Jul 18 16:37:27 2002
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Date: Thu, 18 Jul 2002 18:37:08 -0500 (CDT)
From: Jonathan Lemon <jlemon@flugsvamp.com>
Message-Id: <200207182337.g6INb8n97317@prism.flugsvamp.com>
To: benjamin@dzhan.com, net@freebsd.org
Subject: Re: tcp SYN retries? 
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In-Reply-To: <local.mail.freebsd-net/20020718150136.M46100-100000@crimea.dzhan.com>
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In article <local.mail.freebsd-net/20020718150136.M46100-100000@crimea.dzhan.com> you write:
>
>When I attempt to make a sock_stream connection to an IP, and DON'T
>receive an ACK or RST response, it seems that the system retries a finite
>number of times by sending additional SYN packets.  There also looks to be
>a 3 or 6 second delay between SYN retries.  After four or five, the
>connection fails.
>
>Is there a way I can change the interval time for SYN retries, or decrease
>the number of times it retries?  I would imagine this would be dependent
>on the particular tcp/ip stack implementation of my OS.  I'm using FreeBSD
>and would imaging some kernel sysctl variable would control this...  Any
>ideas?  Or perhaps it's a socket option?

You don't mention what version of FreeBSD you're using.  The latest
versions have a only a 1 sec interval between retries for the first
couple of attempts.  An overall timeout would be best implemented at
the application layer.
-- 
Jonathan

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