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List: winpcap-users
Subject: Re: [Winpcap-users] Multicast packets with TTL=0 reception problem
From: Alberto Avanzi <alberto.avanzi () keeneo ! com>
Date: 2010-09-01 20:56:02
Message-ID: 4C7EBDE2.8000909 () keeneo ! com
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Ok, I will try it and keep you informed.
Thanks,
A.
On 01/09/2010 20:47, Gianluca Varenni wrote:
> I would definitely try using a WinPcap based application. I wonder if
> the TCP/IP stack in Windows 7 drops a packet with a TTL = 0.
> Have a nice day
> GV
>
> *From:* Alberto Avanzi <mailto:alberto.avanzi@keeneo.com>
> *Sent:* Wednesday, September 01, 2010 8:49 AM
> *To:* winpcap-users@winpcap.org <mailto:winpcap-users@winpcap.org>
> *Subject:* Re: [Winpcap-users] Multicast packets with TTL=0 reception
> problem under Windows Seven
>
> Hi Gianluca,
>
> thanks for your reply.
>
> No, they are sent by a standard WinSock-based application.
> If it matters, we could move to a WinPCap-based sender...
>
> Best regards,
> Alberto.
>
> On 01/09/2010 17:46, Gianluca Varenni wrote:
>> Is the packet sent by another WinPcap-based application?
>> Have a nice day
>> GV
>>
>> *From:* Alberto Avanzi <mailto:alberto.avanzi@keeneo.com>
>> *Sent:* Wednesday, September 01, 2010 2:55 AM
>> *To:* winpcap-users@winpcap.org <mailto:winpcap-users@winpcap.org>
>> *Subject:* Re: [Winpcap-users] Multicast packets with TTL=0 reception
>> problem under Windows Seven
>>
>> Just to confirm that it doesn't come from our (receiving) code (from
>> our sending code maybe ?):
>>
>> even the WinPCap 4.1.2 "UDPDump" provided example fails to retrieve
>> these packets.
>>
>> A.
>>
>> On 01/09/2010 11:09, Alberto Avanzi wrote:
>>> Hi,
>>>
>>> our multicast-receiving application is based, since some years, on
>>> WinPCap.
>>>
>>> We use it under Windows XP and Windows Server 2003, and it works
>>> well for receiving multicast
>>> packets independently from their TTL (0, 1 or 2) (with WinPCap 4.0.2).
>>>
>>> The same application running on Seven (with WinPCap 4.1.2) is unable
>>> to receive packets with TTL = 0
>>> (sent by another application on the same machine). It is clearly a
>>> reception problem, because if we use
>>> standard socket code for receiving packets, we get them.
>>> If we set the TTL=1, we receive the packets.
>>>
>>> Any idea ?
>>> Should we modify something in our code in order to get them again ?
>>>
>>> Thanks a lot,
>>> Alberto.
>>>
>>>
>>>
>>> _______________________________________________
>>> Winpcap-users mailing list
>>> Winpcap-users@winpcap.org
>>> https://www.winpcap.org/mailman/listinfo/winpcap-users
>> ------------------------------------------------------------------------
>> _______________________________________________
>> Winpcap-users mailing list
>> Winpcap-users@winpcap.org
>> https://www.winpcap.org/mailman/listinfo/winpcap-users
>>
>>
>> _______________________________________________
>> Winpcap-users mailing list
>> Winpcap-users@winpcap.org
>> https://www.winpcap.org/mailman/listinfo/winpcap-users
>
> ------------------------------------------------------------------------
> _______________________________________________
> Winpcap-users mailing list
> Winpcap-users@winpcap.org
> https://www.winpcap.org/mailman/listinfo/winpcap-users
>
>
> _______________________________________________
> Winpcap-users mailing list
> Winpcap-users@winpcap.org
> https://www.winpcap.org/mailman/listinfo/winpcap-users
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<font face="Calibri">Ok, I will try it and keep you informed.<br>
<br>
Thanks,<br>
A.<br>
</font><br>
On 01/09/2010 20:47, Gianluca Varenni wrote:
<blockquote cite="mid:311C163CA8E54DD682B2B1716FE7BA99@NELSON3"
type="cite">
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
<meta name="GENERATOR" content="MSHTML 8.00.7600.16625">
<div><font face="Calibri">I would definitely try using a WinPcap
based application. I wonder if the TCP/IP stack in Windows 7
drops a packet with a TTL = 0.</font></div>
<div> </div>
<div><font face="Calibri">Have a nice day</font></div>
<div><font face="Calibri">GV</font></div>
<div><br>
</div>
<div style="font: 10pt Tahoma;">
<div style="background: none repeat scroll 0% 0% rgb(245, 245,
245);">
<div style=""><b>From:</b> <a moz-do-not-send="true"
title="alberto.avanzi@keeneo.com"
href="mailto:alberto.avanzi@keeneo.com">Alberto Avanzi</a>
</div>
<div><b>Sent:</b> Wednesday, September 01, 2010 8:49 AM</div>
<div><b>To:</b> <a moz-do-not-send="true"
title="winpcap-users@winpcap.org"
href="mailto:winpcap-users@winpcap.org">winpcap-users@winpcap.org</a>
</div>
<div><b>Subject:</b> Re: [Winpcap-users] Multicast packets
with TTL=0 reception problem under Windows Seven</div>
</div>
</div>
<div><br>
</div>
<font face="Calibri">Hi Gianluca,<br>
<br>
thanks for your reply.<br>
<br>
No, they are sent by a standard WinSock-based application.<br>
If it matters, we could move to a WinPCap-based sender...<br>
<br>
Best regards,<br>
Alberto.<br>
</font><br>
On 01/09/2010 17:46, Gianluca Varenni wrote:
<blockquote cite="mid:1D6D78E4A8054A99992FA9F0A4E2BE49@NELSON3"
type="cite">
<meta name="GENERATOR" content="MSHTML 8.00.7600.16625">
<div><font face="Calibri">Is the packet sent by another
WinPcap-based application?</font></div>
<div> </div>
<div><font face="Calibri">Have a nice day</font></div>
<div><font face="Calibri">GV</font></div>
<div style="font: 10pt Tahoma;">
<div><br>
</div>
<div style="background: none repeat scroll 0% 0% rgb(245, 245,
245);">
<div><b>From:</b> <a title="alberto.avanzi@keeneo.com"
href="mailto:alberto.avanzi@keeneo.com"
moz-do-not-send="true">Alberto Avanzi</a> </div>
<div><b>Sent:</b> Wednesday, September 01, 2010 2:55 AM</div>
<div><b>To:</b> <a title="winpcap-users@winpcap.org"
href="mailto:winpcap-users@winpcap.org"
moz-do-not-send="true">winpcap-users@winpcap.org</a> </div>
<div><b>Subject:</b> Re: [Winpcap-users] Multicast packets
with TTL=0 reception problem under Windows Seven</div>
</div>
</div>
<div><br>
</div>
<font face="Calibri">Just to confirm that it doesn't come from
our (receiving) code (from our sending code maybe ?):<br>
<br>
even the WinPCap 4.1.2 "UDPDump" provided example fails to
retrieve these packets.<br>
<br>
A.<br>
</font><br>
On 01/09/2010 11:09, Alberto Avanzi wrote:
<blockquote cite="mid:4C7E1856.3010805@keeneo.com" type="cite"><font
face="Calibri">Hi,<br>
<br>
our multicast-receiving application is based, since some
years, on WinPCap.<br>
<br>
We use it under Windows XP and Windows Server 2003, and it
works well for receiving multicast<br>
packets independently from their TTL (0, 1 or 2) (with
WinPCap 4.0.2).<br>
<br>
The same application running on Seven (with WinPCap 4.1.2)
is unable to receive packets with TTL = 0<br>
(sent by another application on the same machine). It is
clearly a reception problem, because if we use<br>
standard socket code for receiving packets, we get them.<br>
If we set the TTL=1, we receive the packets.<br>
<br>
Any idea ?<br>
Should we modify something in our code in order to get them
again ?<br>
<br>
Thanks a lot,<br>
Alberto.<br>
<br>
<br>
</font>
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