insomniac

This issue is very frustrating.. I've been trying to use ettercap with etterfilter for the last few days and it's not working. For some reason ettercap doesn't replace the incoming packets. I've put tcpdump on my server, and saw the ettercap DID change Accept-Encoding to Accept-Rubbish!, but nothing get replaced on the way back. I've RTFMed the entire internet, could find any help on the subject. Any ideas? btw - I ran the above filter, no incoming packet was changed.