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<DIV><FONT face="Courier New">As far as I remember, the normal miniport drivers
for the network card limit the maximum packet size to 1514 bytes, because VLAN
is usually managed by the miniport driver itself. So there's no easy way to send
VLAN tagged frames whose size is greater that 1510. An idea that comes to my
mind is trying to use gigagit cards, whose maximum frame size is greater that
1514. But in this case the maximum frame size should be greater than 1514 only
if the negotiated speed is 1Gbps...</FONT></DIV>
<DIV><FONT face="Courier New"></FONT> </DIV>
<DIV><FONT face="Courier New">Have a nice day</FONT></DIV>
<DIV><FONT face="Courier New">GV</FONT></DIV>
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style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=irshadanver@hotmail.com href="mailto:irshadanver@hotmail.com">Irshad
Anver</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=winpcap-users@winpcap.org
href="mailto:winpcap-users@winpcap.org">winpcap-users@winpcap.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Sunday, August 31, 2008 3:02
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> RE: [Winpcap-users]
pcap_sendpacket() returns -1 and does not sendthe packet for rebuilt VLAN
packet</DIV>
<DIV><BR></DIV>Thanks for a reply.<BR> <BR>The original packet size is
1514, but after I add the VLAN Id the packet size is 1518. But WinPCap refuse
to send the packet. How do I send VLAN packets through WinPCap?<BR><BR>
<HR>
<BR>From: <A
href="mailto:gianluca.varenni@cacetech.com">gianluca.varenni@cacetech.com</A><BR>To:
<A
href="mailto:winpcap-users@winpcap.org">winpcap-users@winpcap.org</A><BR>Subject:
Re: [Winpcap-users] pcap_sendpacket() returns -1 and does not send the packet
for rebuilt VLAN packet<BR>Date: Fri, 29 Aug 2008 15:21:32 -0700<BR><BR><BR>
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<DIV><FONT face="Courier New">What is the size of the packets that are not
transmitted?</FONT></DIV>
<DIV><FONT face="Courier New"></FONT> </DIV>
<DIV><FONT face="Courier New">Have a nice day</FONT></DIV>
<DIV><FONT face="Courier New">GV</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=irshadanver@hotmail.com
href="mailto:irshadanver@hotmail.com">Irshad Anver</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=winpcap-users@winpcap.org
href="mailto:winpcap-users@winpcap.org">winpcap-users@winpcap.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, August 25, 2008 9:03
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [Winpcap-users]
pcap_sendpacket() returns -1 and does not send the packet for rebuilt VLAN
packet</DIV>
<DIV><BR></DIV>Dear Sir,<BR> <BR>I have a problem and searched the
Internet and could not find a solution. pcap_sendpacket() returns -1 and
does not send the packet. In my application I have two NICs the first one is
the Internet NIC and the second one is the client NIC. Whenever I receive a
packet in the client NIC I modify the ip and send the same packet through
the Internet NIC. When I receive the packet from the Internet NIC we send
the packet to the correct client through client NIC. I also use ARP spoofing
to enable any client IP address to access the Internet. This is a sort of
network bridging application and it worked well till I tried to send VLAN
packets. For VLAN I connected the Client NIC to the trunk port of the switch
to receive VLAN Tag information. Now when I receive VLAN packets in client
NIC, I note the VLAN tag then I remove the VLAN tag and modifiy the ip
address and send the same through the Internet NIC. When I receive the reply
from the Internet NIC I send the packet to the client by adding the correct
VLAN tag. I use a local array of 2000 bytes to rebuild the packet with VLAN
tag. First copy the client IP addresses and the VLAN tag and then copy the
rest of the packet from the receievd packet from the Internet NIC. But after
some packets Winpcap returns -1 and refuse to send packet through the client
NIC. I could not find any answer and the reason. Please provid me with a
solution.<BR> <BR>Thank you in
advance.<BR> <BR>Regards,<BR>Irshad<BR><BR>
<HR>
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