[PLUG] mangle rule to foil idiot ISPs

[Daniel Hedlund]

Carla Schroder wrote:
> The idea is to foil idiot ISPs who don't want users sharing their Internet 
> connections by setting all TTLs to the same value. Should be a felony, having 
> your own LAN.

Do the ISPs really care?  They have rules, but do they really care? 
There are so many problems with restricting Internet to just one 
computer.  What happens if that one physical computer is using raw 
sockets or has a virtual machine (VMware, QEMU, Virtual PC, etc) running 
and the client operating system has a different TTL?  If ISPs really 
wanted to track down how many individuals on a network, there are many 
many different ways to go about it.  Some other examples include 
checking http requests to see if multiple brower strings are present 
(ie. two versions of Internet Explorer or Firefox, epecially if on two 
different platforms).  Some http requests (at least used to) send out 
the username of the person using the computer.

Cheers,

Daniel Hedlund
daniel at digitree.org