[Winpcap-users] win 7 loopback adapter with winpacp pcap_sendpacket sending multicast packets

[you yuan]

I wonder if there is some way to set win 7 network behavior compatible with
xp.Try to solve the problem with least modification

On Wed, Mar 2, 2011 at 9:37 PM, Alberto Avanzi <alberto.avanzi at keeneo.com>wrote:

>  Hi,
>
> I found some time ago a problem similar to yours, that make me think that
> yes, network behavior changed from
> XP to Win7.
>
> In my case, packets emitted on a multicast socket using standard winsock2
> API AND with TTL=0 are NOT SEEN by winpcap
> (that runs on the same host because of TTL=0). Changing TTL to 1 allows
> winpcap to receive them on the local host or on
> a remote host on the same network.
>
> This has changed from XP, where TTL=0 packets were seen and captured by
> winpcap.
>
> Someone suggested that probably win7 does not inject datagrams with TLL=0
> into the network adapter, but uses a
> somehow different distribution system.
>
> A.
>
> On 02/03/2011 13:46, you yuan wrote:
>
> Hi,Thanks for help.
> According to the test, it's ok for transmitting on different computers.
> I have written a simple cmd program using winpcap's api to receive packets
> from the loopback adapter. It shows capture is ok.
> So I think maybe something changed for xp and win7 loopback adapter system.
> The winpcap's api and winsock's mechanism behave differently on xp and win
> 7?
>
> On Wed, Mar 2, 2011 at 2:02 PM, Gianluca Varenni <
> Gianluca.Varenni at riverbed.com> wrote:
>
>> Do the same packets get send on a standard non-loopback adapter (i.e.
>> transmitter and receiver on different computers)?
>>
>> Have a nice day
>> GV
>>
>> ________________________________________
>> From: winpcap-users-bounces at winpcap.org [
>> winpcap-users-bounces at winpcap.org] On Behalf Of you yuan [
>> yuanprivacy at gmail.com]
>> Sent: Sunday, February 27, 2011 3:39 AM
>> To: winpcap-users at winpcap.org
>> Subject: [Winpcap-users] win 7 loopback adapter with winpacp
>> pcap_sendpacket    sending multicast packets
>>
>> HI,everyone
>>  Recently I have come across a problem concerning winpcap sending
>>  multicast packets on windows 7 loopback adapter.
>>  Here have an application with two componets.One componet is a
>> simulator using winpcap to send and receive multicast packets on
>> windows networks adapters with fixed ip(i.e,192.10.x.x). Another is a net
>> module using winsock's setsockopt,ioctlsocket, recvfrom etc
>> functions to receive multicast packets sent by the first componet.
>>  My problem is when I use windows 7 loopback adapter with fixed ip,the
>> first compent can send packet out(see it from the wireshark), But the net
>> module component can't receive any packets. However, the same application
>> really works on windows XP.
>>  I rarely know anything winpcap packet sending mechanisms with
>> windows loopback adapter.I don't know how to fix the problem under windows
>> 7.
>>  I have searched many times but gain nothing.Does anyone have the similar
>> problem or know something  or some keywords about this, please help. Thanks
>> in advance.
>>
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>> Winpcap-users at winpcap.org
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>>
>
>
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