Hi there,
As far As I know, I can't just make echo 1 > /proc/net/ipv4/ip_forward on a N900, as this is not a kernel part, and even if it was, it wouldn't do what I plan to dev, that is IP Raw sockets (I would like osi layer 2 handled by kernel), to act like a router, with some packet rewriting purpose (like the user agent ). I know on linux I would be able to use raw sockets / capture, or using libcap.
What i'm aiming to do is quite simple in fact, selecting an inside interface (can be USB, WiFi, Bluetooh, everything that has an IP connection), capture packets, reinject them to an outside interface (you guessed this is 3g/edge/... interface), with some packet rewriting, the first would be to do PAT but I would allow further rewrite rules...

Well, you I want your advices guys to tell me if you have such experiences using raw sockets or libpcap on maemo/N900.

I already developped in Qt (that's a while, i'm not a developer ), and used Raw ethernet sockets.

the simpliest (for me) would be to use scapy (very simple framework in python to capture/forge packets), but don't know if the maemo python engine will allow socket manipulation.

In advance, thanks of the advices you would give me.

Finally, I guess there's no gcc on maemo and I have to cross compile for arm processors, right ?