[Winpcap-users] winpcap3 and winpcap4 bridge

[Gianluca Varenni]

----- Original Message ----- 
From: "izua richard" <izua.richard at gmail.com>
To: <winpcap-users at winpcap.org>
Sent: Monday, June 09, 2008 8:46 AM
Subject: [Winpcap-users] winpcap3 and winpcap4 bridge


> Hey!
> First of all, please don't bash if I make any mistakes, since I'm new with 
> the mailing list concept. If there is such a thing as a web interface, I'd 
> gladly use that. But for now, I'll just keep waiting for my email client 
> to yell.
>
> Anyway. My problem is as follows: I use ISIS VSM simulator, which in turn 
> uses winPcap. I develop Ethernet applications for microcontrollers. This 
> simulator can directly inject packets into my networks using winPcap, but 
> it uses version 4.
>
> I need to craft this packets somehow. Of course, I could always do it by 
> hand, but I might make a mistake, and I'll have to compute three bloody 
> checksums for a single UDP frame (ethernet, ip headers, udp checksum). I 
> have a program to do this, nemesis. It's a nice thing this can also inject 
> the packet into my network, so I can see how everything should react when 
> the simulator would send it. However, nemesis doesn't work with winPcap4, 
> it needs winPcap3. It's really awkward to keep doing 
> uninstall4/install3/uninstall3/install4.
>
> Is there some kind of bridge or compatibility layer between the two? If I 
> use ISIS with 3, it crashes. If I uses nemesis with 4, I get an error for 
> missing entry point in packet.dll.
>

WinPcap 3.x and 4.x should be completely compatible *if* they use the 
documented APIs i.e. the API exported by wpcap.dll. I suppose that nemesis 
uses the undocumented packet.dll API and that API can change over time. What 
is the missing entrypoint in packet.dll? Have you tried contacting the 
authors of nemesis?

Have a nice day
GV

> Any ideas?
> Thanks,
> Richard
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