This course covers TCP tunneling applications, explaining how it works, its various applications, and the pros and cons associated with it. Students will learn about creating legitimate TCP connections, local port forwarding, SOCKS proxy, and HTTP tunneling. The teaching method involves a detailed explanation using examples and scenarios. This course is intended for individuals interested in understanding TCP tunneling, VPNs, network security, and bypassing restrictions imposed by firewalls.
TCP Tunneling Applications - Pros and Cons Explained by Example
Overview
Syllabus
You create a legit tcp connection over a known protocol such as SSH between you and Server1. You then create a tcp packet that is intended for Sever2 so you tag it with Server. Then you package that packet into another TCP packet intended for Server1! Huh ! Server1:22. You then forward the packet over, your ISP police will see that there is a packet intended to Server1 on port 22. Proxy approves and forwards it over not knowing that you are smuggling content in that packet. Also the proxy cant even look in the content because its encrypted with RSA. Server1 unpacks the package, decrypt and discover that its an other tcp packet. Here is where the shady stuff happen. Server1 now looks and see that the smuggled package is intended for Server, created a connection and delivers the package it, it changes the source ip to its self and keeps track somehow of that. Once it receives the package it knows that this package has to go back to tunnel. The client now have access to the blocked site! What does this look like guys? Yes you guessed it its a VPN.
TCP VS UDP
OSI model
private vs public ip
proxy vs reverse proxy
TLS
local
reverse
socks
Taught by
Hussein Nasser
