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Date: Thu, 11 Apr 2002 17:07:40 +0200
From: Corinna Vinschen <cygwin AT cygwin DOT com>
To: cygwin <cygwin AT cygwin DOT com>
Subject: Re: Wierdness of WSASendTo()??
Message-ID: <20020411170740.B20801@cygbert.vinschen.de>
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References: <200204111417 DOT g3BEHfY06583 AT mx1 DOT redhat DOT com>
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On Thu, Apr 11, 2002 at 08:20:59AM -0600, Mark Paulus wrote:
> MTR believes it's sending out a good ICMP packet of 64 bytes (0x40).
> cygwin_sendto() also thinks it's sending out 64 bytes (as reported by strace).
> 
> However, tcpdump on my linux box is receiving 84 bytes.  
> 
> What it looks like to me is that somehow WSASendTo is re-formatting 
> the packet that is going out.  But, this
> turns it into an invalid packet, and causes a "network unreachable" error
> on the linux box, and the response never comes back.
> 
> Has anyone seen this behaviour before??

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winsock/wsanxref_8xo2.asp

Look for IP_HDRINCL.


Corinna

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Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Developer                                mailto:cygwin AT cygwin DOT com
Red Hat, Inc.

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