TCP connection passing

TCP connection passing

[Werner Almesberger]

Here's something creepy for Halloween: a dirty little hack that 
allows you to pass TCP endpoints across hosts, across reboots, 
etc.

http://www.almesberger.net/tcpcp/tcpcp-0.tar.gz

(Includes a patch for 2.5.45, a bit of user space, and plenty of
documentation of its shortcomings. The patch is a bit deceptive:
in order to make timestamps work properly, more invasive changes
are needed.)

I got the idea for this hack while listening to Fabio Olive
Leite's talk about load-balancing at Linux-Kongress, but 
besides that, he's not to blame for it.

The implementation is a proof of concept, which is quite sloppy
with timestamps, MSS, window, etc., and don't even look at what 
it does to congestion control ...

Anyway, it seems to work, and it's fun to play with. 

- Werner

-- 
  _________________________________________________________________________
 / Werner Almesberger, Buenos Aires, Argentina         wa@almesberger.net /
/_http://www.almesberger.net/____________________________________________/

TCP connection passing

[Oren Laadan]

Hi Dan,

Not totally up to date, and not exactly the same, but relevant
nevertheless:

http://www.almesberger.net/cv/papers/tcpcp-ols2004.pdf
http://tcpcp.sourceforge.net/

Oren.

Re: TCP connection passing

[Dan Smith]

OL> Not totally up to date, and not exactly the same, but relevant
OL> nevertheless:

Yep, I read this paper before I started much of the network stuff.
However, now that I've been up to my neck in it, it might be good to
re-read it :)

-- 
Dan Smith
IBM Linux Technology Center
email: danms-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org