Great Circle Associates Firewalls
(November 1996)
 

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Subject: Re: Ports 1417-1420
From: lists @ lina . inka . de (Bernd Eckenfels)
Date: Thu, 28 Nov 1996 03:20:33 +0100 (MET)
To: daveg @ interport . net (Dave Glosser)
Cc: firewalls @ greatcircle . com
In-reply-to: <Pine . SUN . 3 . 95 . 961127202002 . 15172A-100000 @ interport . net> from "Dave Glosser" at Nov 27, 96 08:22:02 pm

> 149.xx is our subnet. The other sites listed are known sites such as
> yahoo, cnn, netscape, etc. What kind of information is sent over those
> ports?  Ports 1417-1420 are listed in the IANA as assigned to TB2. Can
> Netscape be using these ports? Any information is appreciated.

Local Ports are assigned randomly, the way they are unique on the loal
machine. Usually this is done by assigning for each outgoing connection the
next port. This assignment may start above 1024. Reserved Ports are only for
receiving/listening, not for binding to send data. In your Firewall Rules
you need to distinguish between incoming and outgoing connections.

Youshould realy read a good bok on TCP/IP before you start to configure a
packet filter. Most probably the filter is not secure that way, or won't
work.

Greetings
Bernd


References:
Indexed By Date Previous: Re: IP numbers end
From: Paul Ferguson <pferguso @ cisco . com>
Next: Re: Cisco PIX
From: "Robert J. Brown" <rjb @ calyx . net>
Indexed By Thread Previous: Ports 1417-1420
From: Dave Glosser <daveg @ interport . net>
Next: FW-1 for ISP's
From: felipe @ pty . com (Ing. Felipe Tribaldos)

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