off-topic, but skills in Linux are important

[nx13372 <nx13372a@net.vodafone.pt>]

Hi all,
since in Linux it's so easy to control de layer 3 of the tpc/ip with 
netfilter, i was wondering if it's possible to create a program that 
runs on Microsft XP and (to start) change the TTL on the header of each 
packet when sending . And why not discard packets that have for example 
a TTL !100 when recebing!? This program must work with any ethernet 
card. Is this possible? After the card driver, is must be the first 
service that access to tcp/ip stack.

thanks in advance.