Comments on: Linux: The hole trick to bypass firewall restriction

By: Reynold

Reynold — Tue, 13 Dec 2011 11:08:56 +0000

Thanks for the article :)

By: funtikar

funtikar — Sat, 09 Jan 2010 01:51:32 +0000

im exactly in the exact situation as the guy above me(cyberking)…im currently using this commrcial sw namely yourfreedom to tunnel http over udp through the yf udp server..but as cyberking said the bandwidth is quite limited…

By: cyberking.vb

cyberking.vb — Mon, 09 Nov 2009 18:03:54 +0000

hey bro, i need your help,

in most of the mobile networks the udp ports are free… means i can browse free using udp.. i am currently using your-freedom to connect me through udp. but there is nonly limited bandwidth provided by the your-freedom… can u pls tell me a way to tunnel through udp without your-freedom.. send me email..

By: saga

saga — Sat, 27 Dec 2008 14:47:37 +0000

Hi,
Blocking connect access to numerical ip addresses blocks skype and ultrasurf :(
look at the squid acl’s below and try for yourself

acl num_IPs url_regex ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+

http_access deny CONNECT num_IPs all

please notify me if i could get around this.

By: vivek

vivek — Tue, 06 Nov 2007 13:25:31 +0000

umar,

This Linux specific tip.

By: umar

umar — Tue, 06 Nov 2007 10:24:27 +0000

i am windows vista 32 how can i try your trick
thanks in advance

By: nixcraft

nixcraft — Fri, 22 Dec 2006 07:33:33 +0000

Thanks for comment :)

By: port25

port25 — Fri, 15 Dec 2006 20:46:04 +0000

Hey great find and thanks for pointing out article.

The only way to prevent this is to block UDP entirely using iptables since UDP is connectionless, a stateful iptables firewall will not able to block anything. This is a great hack, IMPO.

PS: I am reading your blog since last one year but this is first time I am writing a comment :)