Bittorent recognition from packet payload

[chipakis]

Hello, i am trying to recognize whether the incoming packet belongs to a bittorrent activity. What i've done so far is to create a copy of the packet to CPU and from there try to inspect inside the packet payload for traces of bittorrent activity and change the priority channel, is it possible that it can somehow workout?
Secondly, i am trying also to add NAT services on my network for some internet connection, but i haven't found the way to do it yet, is there a way to do it?

[edgar-costa]

1. For the bittorrent question. You will have to look at how bit torrent packets look like and write a script that does the parsing according to your needs.

2. Directly with P4 utils there is no available NAT services. But you can setup that yourself. You will have to configure one node at the root namespace to act as NAT, look for some linux tutorial about that, and then you configure the hosts and devices in your emulated network such that traffic destined to the internet go to the NAT.