[66639] in North American Network Operators' Group
OT: tos bits - current usage
daemon@ATHENA.MIT.EDU (Simon Waters)
Sun Jan 18 16:10:56 2004
Date: Sun, 18 Jan 2004 21:10:05 +0000
To: Nanog Mailing List <nanog@merit.edu>
From: Simon Waters <Simon@wretched.demon.co.uk>
Errors-To: owner-nanog-outgoing@merit.edu
This is an OpenPGP/MIME signed message (RFC 2440 and 3156)
--------------enig298B52FE5D949943C9F5F0B4
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Can anyone point me to any resources describing the current usage of the
tos precedence bits.
Specifically what happens in practice, not what is suppose to happen (I
can find the RFC's and IETF documents okay).
Prompted by noting that a lot of spambots set the lowest precedence bit
(tos 0x20 in tcpdump), I assume this is just a reflection of what
operating system is in use/has been compromised?
Internet search engines seem to think the whole point of the tos bits is
to allow you to more accurately fingerprint remote operating systems, at
least that is what the naive searcher might conclude.
--------------enig298B52FE5D949943C9F5F0B4
Content-Type: application/pgp-signature
-----BEGIN PGP SIGNATURE-----
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org
iD8DBQFACvYuGFXfHI9FVgYRAhdXAKCO1ow1Mukk3U939SujmlsVkPwH7QCdEIJo
CZvxythe64I8+tAcMPy+LiY=
=JLkF
-----END PGP SIGNATURE-----
--------------enig298B52FE5D949943C9F5F0B4--
