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Date: Fri, 13 Jun 2008 09:24:27 +0200
From: Spiro Trikaliotis <an-cygwin AT spiro DOT trikaliotis DOT net>
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Subject: Re: Bug in ping?  ICMP Sequence Number octets are reversed
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Hello,

I just had a (short) session with Wireshark:

* On Thu, Jun 12, 2008 at 10:39:09PM -0700 Gary Johnson wrote:

> I've been using Cygwin's ping (/usr/bin/ping, ping-1.0-1) to do some 
> testing of IP over a wireless modem.
[...]
 
> It looks like someone just wrote a short integer to the sequence 
> number field without calling htons() to perform the possible 
> little-endian to big-endian conversion.

I can confirm this for both cygwin ping and for Windows (XP SP2) ping.

> I 
> would compare it to ping on other systems, but I don't have a 
> convenient way to sniff those packets.

Well, Debian/Linux (Etch, v4.0) does it in network byte order, as one
(might) expect. Differently to the Windows and Cygwin ping, it starts
the sequence number with 1, not with 0.

Should it be changed? I don't know, I never had a problem with it, but
others might.

Regards,
Spiro.

-- 
Spiro R. Trikaliotis                              http://opencbm.sf.net/
http://www.trikaliotis.net/                     http://www.viceteam.org/

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