@Home bans VPNS

john benjamins johnb at SOLITON.COM
Fri Aug 25 15:15:06 EDT 2000


On Thu, Aug 24, 2000 around 09:36 +0000 Bob Hammond may have written:
} In practice, how can they detect or prevent VPN users?  Doesn't it just look
} like IP traffic?

remember that there are a number of IP protocols:

 TCP is IP protocol 6
 UDP is IP protocol 17
 ICMP is IP protocol 1

 IPSec ESP is IP protocol 50
 IPSec AH is IP protocol 51
 PPTP uses TCP port 1723, but also IP protocol 43 (GRE)

so now your ISP just has to allow only protocols 1, 6 and 17.  note
these are protocol numbers, not TCP/UDP port numbers, which are a
different thing altogether (e.g. on Unix, see /etc/protocols, as
opposed to /etc/services).

hope this helps,			-john

-----
john benjamins					johnb at soliton.com
-----
 The authorities on whom I depend suggest that we are all warped and
 that only Pat Boone is not.  I am comfortable with that.
        - Padgett Powell, Mississippi Review, Vol. 27, No. 3

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