how to read from a ethernet connection

[faladrim]

hi, i want to read from a microprocessor that is directly connected with a croseover ethernet cable but i dont know how. on the processor site is everyting in order, i am able to ping to my pc and from my pc using Dos command. how do i set up the comm using c#?? i know it has something to do with Tcpclient but there i need a portnumber wich i don't know, i don't need acces to the internet. can anybody help plzz thx