pcap_inject troubleshooting

[David Murray <30179198 () student murdoch edu au>]

Hi,

I am writing an application using the libpcap library that is capable 
of caching and replaying frames. I originally wrote and tested this 
program using a embedded ALIX system that runs a 500Mhz Geode 
processor. I felt that the slow performance of this CPU was causing a 
few problems so I decided to try it out on a proper desktop PC. 
However, I am having problems with the pcap_inject function. While the 
other functions appear to work fine, pcap_inject is returning the error 
?send: message too long?. The function also returns -1.

By printing out the packet size I know that this frame is 1552 bytes 
which is higher than the end-to-end MTU of 1500 bytes. However, this is 
also confusing, because when I run the same code on my embedded 
machine, which works, the packet size also appears to be 1552 bytes. 
The embedded machine is running a Debian variant called Voyage Linux 
whereas the Desktops I have tried this code on are running Ubuntu 
Intrepid. I have tried two IBM and Dell desktops and a range of wired 
NICs. Maybe a key difference between the two systems is that on the 
embedded system, packet injection occurs over a Atheros WiFi interface 
whereas on the desktops packet injection occurs over the Wired NIC.

Can anyone suggest some thing I can try to further define this problem?

Thanks Dave

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