Hi nicola ,
the fact that your modem didn't send the packet is with every probability
due to the ndiswan driver, the one that controls PPP interfaces. On some
Win9x systems, it discards the packets sent by protocol drivers different
from MS TCP, without returning any error. Therefore, winpcap believes that
the packet was sent correctly also if no transmission occurred.
We don't have solutions for this problem at the moment.
Loris
----- Original Message -----
From: "Nicola Tremori" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, June 06, 2002 8:15 PM
Subject: [WinPcap-users] Sending RAW IPacket over Internet by using
wpcap+win98
> Hi..I've got problems when I send packets with WpCap
> over a dial-up connection to my provider of course
> (PPP-serial modem).
> Well, I built the "various headers" as Packet.dll's
> doc tells me. In particular, after I tried it, I
> gained this dump...but my modem didn't send the
> packet!!!..:
>
> Packet length, captured portion: 54, 54
> 00000000 : 20 53 52 43 00 00 44 45 53 54 00 00 08 00
> 45 00 SRC..DEST....E.
> 00000010 : 00 28 0a 00 40 00 80 00 xx xx 01 01 01 01
> xx xx .(..@.�.ۤ......
> 00000020 : xx xx 40 40 40 40 40 40 40 40 40 40 40 40
> 40 40 ..@@@@@@@@@@@@@@
> 00000030 : 40 40 40 40 40 40
> @@@@@@
>
> [ In this dump, I suppressed the destIP and checksum
> which is of course calculated ]
>
> Here u can see the first 14 bytes of Ethernet frame
> (is it virtual on PPP?)..and then u can notice 20
> bytes of IP Header and finally some data append to it.
>
> About IP Header, I've built it manually filling the
> various fields of the following structure
>
> struct IPHeader {
> BYTE h_len:4; // length of the header
> BYTE version:4; // Version of IP
> BYTE tos; // Type of service
> USHORT total_len; // total length of the packet
> USHORT ident; // unique identifier
> USHORT frag_and_flags; // flags
> BYTE ttl;
> BYTE proto; // protocol (TCP, UDP etc)
> USHORT checksum; // IP checksum
>
> ULONG sourceIP;
> ULONG destIP;
> };
>
> Then, I sent the packet via a PacketSendPacket(...)
> where the Adapter's name is "PPPMAC" which is typical
> of Win9x.
>
> Important: my OS is WIN98-OEM......
>
> So...does it depend on OS? Is there another way to
> send this kind of RAW packets over Internet?
> PLX..Let me know news as soon as possible.
> I'd be very greatfull if u could send me Solutions
> about this problem..'cause I use this library for the
> first time.
>
> So..THANK YOU ! Bye Bye
>
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