[51813] in Cypherpunks
Re: FCC & Internet phones
daemon@ATHENA.MIT.EDU (Adam Shostack)
Sun Mar 10 00:14:00 1996
From: Adam Shostack <adam@lighthouse.homeport.org>
To: wlkngowl@unix.asb.com (Mutant Rob)
Date: Sun, 10 Mar 1996 00:07:20 -0500 (EST)
Cc: cypherpunks@toad.com
In-Reply-To: <199603100222.VAA06105@bb.hks.net> from "Mutant Rob" at Mar 9, 96 09:22:46 pm
Mutant Rob wrote:
| > Q: Is it practically possible to find netphone traffic on a
| > generic network at any level above the source and target addresses?
|
| Good question.
Presumably, the signal has a number of charictaristics. Some of them
have a central switchboard, where preople go to set up calls. Most
presumably use a mix of a UDP data connection and tcp for control
functions. They all consist of high volume, long duration connections
(or data flows in the case of UDP.) Many probably use a standardized
destination port. They might use the urgent pointer to force data up
the stack quickly.
In short, yes the data streams can be easily found, if one can
tap and grep a T3 in real time.
Adam
--
"It is seldom that liberty of any kind is lost all at once."
-Hume
