From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <df0212207029002d16c24ce46663bd51@coraid.com>
From: erik quanstrom <quanstro@coraid.com>
Date: Wed, 16 Apr 2008 14:36:07 -0400
To: 9fans@9fans.net
In-Reply-To: <2325a9806a9bf5b576674c8b648758e9@terzarima.net>
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Subject: Re: [9fans] telnet vs. godaddy whois
Topicbox-Message-UUID: 8ef8e372-ead3-11e9-9d60-3106f5b1d025

> > Plan 9 ignores the zero length window and sends a single byte (2456ms),
> > causing godaddy to hang up (2493ms).
>
> it is probing the zero window (rfc793, section 3.7)

for those, like me, who have not committed 793 to memory:

	"When the receiving TCP has a zero window and a segment arrives it must
	still send n acknowledgment show its next expected sequence number
	and current window (zero).

p. 41 near the bottom.  looks like godaddy's tcp has the bug.

- erik