Raw sockets need root priviliege

Question

Why do we need root privileges when we use raw sockets ?

Answer 1

In short raw sockets is restricted to root because if it otherwise it would break other rules for networking that are in place.

A long standing rule is that you cannot bind on a port lower than 1024 without root's blessing. With raw sockets you can simulate a server on any port. (naturally being able to receive on this port is a different story you'd also have to sniff the network, but perhaps this could be done with a different machine.)