tcp/udp proxy tool

Hi,
I wonder if you know any tool similar to Paros Proxy but for TCP/UDP. I´m looking for a proxy for IP traffic, where I can easly do man in the middle attacks just changing what I want and leaving the rest.
Tools like scapy are ok but you need to spend too much time gathering from sniffer,simulating a full communication,etc... I spend some time trying to make scapy as proxy and it or me failed.
I found a proxy for TCP (I don´t remember the name) but it didn´t do UDP that is what I need.

Thanks,

Mario


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