From: erik quanstrom <quanstro@quanstro.net>
To: 9fans@9fans.net
Subject: Re: [9fans] telnet vs. godaddy whois
Date: Thu, 17 Apr 2008 15:29:42 -0400 [thread overview]
Message-ID: <41b9f1bf163c2d3c41e182407477eb28@quanstro.net> (raw)
In-Reply-To: <20080417184152.369735B52@mail.bitblocks.com>
> On Thu, 17 Apr 2008 09:18:31 BST Charles Forsyth <forsyth@terzarima.net> wrote:
>> > having said that, i now suspect that sending one byte into a zero-window is
>> not the problem.
>>
>> because the one-byte probe can only be done if there is data to send, and i
>> already knew that a plain connection (dial only) to that port also failed:
>
> Not setting the PSH bit on a pure ACK (== no data is being
> sent) seems to fix this (see ip/tcp.c around line 2530). May
> be it tickles a bug on the receiver (0 byte read?).
this does work for me. is there some subtile reason *to* set the psh bit
on a pure ack? in certain circumstances?
good call. from rfc793, p 42:
[...] If the the user signals a push function then the
data must be sent even if it is a small segment.
minooka; 9diff ip/tcp.c
/n/sources/plan9//sys/src/9/ip/tcp.c:2529,2535 - ip/tcp.c:2529,2535
}
}
- if(sent+dsize == sndcnt)
+ if(sent+dsize == sndcnt && dsize)
seg.flags |= PSH;
/* keep track of balance of resent data */
- erik
next prev parent reply other threads:[~2008-04-17 19:29 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-15 17:16 erik quanstrom
2008-04-16 13:31 ` Russ Cox
2008-04-16 13:46 ` Charles Forsyth
2008-04-16 16:52 ` Michaelian Ennis
2008-04-16 18:36 ` erik quanstrom
2008-04-16 19:04 ` ron minnich
2008-04-16 19:48 ` Bakul Shah
2008-04-16 20:25 ` Tim Wiess
2008-04-16 20:49 ` Charles Forsyth
2008-04-16 21:43 ` Taj Khattra
2008-04-16 22:00 ` John Barham
2008-04-16 22:20 ` C H Forsyth
2008-04-16 23:26 ` Bakul Shah
2008-04-17 0:04 ` Charles Forsyth
2008-04-17 8:18 ` Charles Forsyth
2008-04-17 18:41 ` Bakul Shah
2008-04-17 19:29 ` erik quanstrom [this message]
2008-04-17 20:59 ` Tim Wiess
2008-04-17 21:19 ` Charles Forsyth
2008-04-17 21:23 ` Tim Wiess
2008-04-17 21:56 ` Charles Forsyth
2008-04-17 22:06 ` Charles Forsyth
2008-04-17 22:43 ` Tim Wiess
2008-04-17 23:02 ` Charles Forsyth
2008-04-17 23:09 ` Charles Forsyth
2008-04-21 14:56 ` erik quanstrom
2008-04-21 15:24 ` Charles Forsyth
2008-04-21 19:37 ` erik quanstrom
2008-04-21 20:20 ` Charles Forsyth
2008-04-21 19:28 ` Bakul Shah
2008-04-21 20:19 ` Charles Forsyth
2008-04-21 20:19 ` Charles Forsyth
2008-04-21 21:06 ` Bakul Shah
2008-04-21 21:24 ` Charles Forsyth
2008-04-21 21:40 ` Wes Kussmaul
2008-04-21 21:45 ` erik quanstrom
2008-04-21 22:04 ` Wes Kussmaul
2008-04-21 21:57 ` Charles Forsyth
2008-04-21 22:07 ` Bakul Shah
2008-04-21 23:12 ` Charles Forsyth
2008-04-21 21:49 ` erik quanstrom
2008-04-21 22:42 ` Bakul Shah
2008-04-17 21:42 ` Bakul Shah
2008-04-17 21:49 ` Charles Forsyth
2008-04-17 21:49 ` erik quanstrom
2008-04-17 22:15 ` Charles Forsyth
2008-04-17 22:19 ` erik quanstrom
2008-04-17 22:48 ` Charles Forsyth
2008-04-17 22:55 ` Tim Wiess
2008-04-17 23:08 ` Charles Forsyth
2008-04-17 22:14 ` Bakul Shah
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=41b9f1bf163c2d3c41e182407477eb28@quanstro.net \
--to=quanstro@quanstro.net \
--cc=9fans@9fans.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).