0
votes
0answers
20 views

Is it possible to covertly tunnel data using L3DSR? (or any other TCP or IP layer hack)

I asked this question on ServerFault regarding how a Netscaler embeds low level data in a TCP packet, round-trips it, and then uses that data to loadbalance the user. Similar to DNS Tunneling, I ...
1
vote
4answers
778 views

Connections through Firewalls explained

I'm looking for a good explanation of how connections work through firewalls. I've got the idea of packaging(encapsulating) some protocol inside another one as its payload when tunneling. But what I ...
3
votes
3answers
6k views

How to create ssh tunnel using netcat?

I want to create reverse connection between two machines, but these is a firewall in the middle preventing all connections, except ssh. I want to create ssh tunnel using netcat, could you please tell ...
0
votes
2answers
663 views

Enabling firewall for the IPv6 tunnel on Windows 2008 64-bit

I am currently on a IPv4 network. The IPv4 network is accessed by a router, which gives my machines IPv4 addresses via NAT. On one of the machines, a Windows 2008 64-bit machine, I have set up a IPv6 ...
17
votes
5answers
6k views

Do you detect/react to DNS tunnelling?

I've just seen a talk about tunnelling TCP/IP over DNS requests, because port 53 UDP is usually open and unfiltered. What techniques exist to detect and block such tunnels, and have you ever seen that ...