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Date:      Tue, 7 Jul 1998 05:53:09 +0000 (GMT)
From:      Terry Lambert <tlambert@primenet.com>
To:        leifn@internet.dk
Cc:        tlambert@primenet.com, freebsd-isp@FreeBSD.ORG
Subject:   Re: SASL References
Message-ID:  <199807070553.WAA00849@usr06.primenet.com>
In-Reply-To: <Pine.BSF.3.96.980706204647.275D-100000@darla.swimsuit.internet.dk> from "Leif Neland" at Jul 6, 98 08:49:23 pm

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> > This a very annoying.  The same functionality for dynamic IP addresses
> > polling a server for queued mail is available through a correctly
> > configured split dynamic DNS and the existing ETRN verb.
> > 
> 
> Is there a simple instruction to do this split dynamic DNS somewhere?

There is a perl implementation, but not a radiusd implementation
that is freely available.  If you search for

	+perl +"dynamic dns"

on altavista, the reference pops right up:

	http://simmons.starkville.ms.us/tips/081797/

This is somewhat less than satisfying, in that it requires the ISP to
trust the "ppp-up"/"ppp-down" on the client to do the updates at the
ISP.  But it shows how it can be done.

A radiusd implementation is more interesting.  I've been trying to
convince a number of companies to fund one, since it would want to
be applied to all the implementations available so the technology
gets widely adopted.

The amount of work is small, but the test-bed would require several
machines, a terminal server that uses radiusd (and supports reporting
"Framed-IP-Address" reply item, or supports acting as a DHCP client,
and which provides the "Framed-IP-Address" to the client explicitly).

This is a relatively small hack, but is more difficult on FreeBSD because
FreeBSD integrates the bind 4.x.x library into libc, and dynamic DNS
requires that you run bind 8.x.x (on the internal DNS server, at least).

You can compile the bind distribution, and link with -lresolv before -lc,
and this will allow you to make the DDNS update calls.


One annoying note: Microsoft's "Internet Authentication Server" for NT
already supports this:

	http://irpcomm.microsoft.com/sbs/ispkit/system2.htm

(see the second to last bold subheader item).


					Terry Lambert
					terry@lambert.org
---
Any opinions in this posting are my own and not those of my present
or previous employers.

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