From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <4f34febc0804161500v5ae4fab8i9b5da35a31d4607f@mail.gmail.com>
Date: Wed, 16 Apr 2008 15:00:43 -0700
From: "John Barham" <jbarham@gmail.com>
To: "Fans of the OS Plan 9 from Bell Labs" <9fans@9fans.net>
In-Reply-To: <57a21f730804161443t2de4a0f3r33ea6aa875f462d1@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
References: <20080416194804.E3B735B54@mail.bitblocks.com>
	<c37807040bc5562c9466ad307a081259@terzarima.net>
	<57a21f730804161443t2de4a0f3r33ea6aa875f462d1@mail.gmail.com>
Subject: Re: [9fans] telnet vs. godaddy whois
Topicbox-Message-UUID: 8f2a434a-ead3-11e9-9d60-3106f5b1d025

> >  read the section of the rfc i mentioned earlier.  it probably ought to probe
>  >  only after a retransmission timeout period
>
>  i believe bsd-based tcp stacks also send 1-byte zero-window probes
>  but use a persist timer that starts at approx. 5 seconds (*)

That's the behaviour that's suggested in Stevens' TCP/IP Illustrated,
Volume 1.  The relevant section is post (legally?) here:
http://www.uic.rsu.ru/doc/inet/tcp_stevens/tcp_pers.htm