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
<[email protected] <mailto:[email protected]>>
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: [email protected]
<mailto:[email protected]>
[[email protected]
<mailto:[email protected]>] On Behalf Of you yuan
[[email protected] <mailto:[email protected]>]
Sent: Sunday, February 27, 2011 3:39 AM
To: [email protected] <mailto:[email protected]>
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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