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Date:      Wed, 27 Nov 2002 08:06:07 +0100
From:      "Leif Neland" <leifn@neland.dk>
To:        <freebsd-isp@FreeBSD.ORG>
Subject:   Re: Dynamic DNS Server
Message-ID:  <00a001c295e3$782aa250$6d05a8c0@gina>
References:  <20021118231031.GA74664@yazzy.org> <06f701c29591$033fbae0$68c311cc@vineyard.net>

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----- Original Message -----
From: "Eric W. Bates" <ericx@vineyard.net>
To: "Marcin Jessa" <yazzy@yazzy.org>
Cc: <freebsd-isp@FreeBSD.ORG>
Sent: Tuesday, November 26, 2002 10:15 PM
Subject: Re: Dynamic DNS Server


>.
>
> What's wrong:
> I have to do some reading and experimentation about bind9 RR's.  I'm not
> sure what is a reasonable TTL to submit with the A record with the new IP.
> I don't know whether the name server will delete the record when the TTL
> expires

I've seen TTL's between 60 and 300 seconds for ddns.

The nameserver does not delete information it is authoritative for; ttl is
just used to tell when non-authoritative systems are supposed to fetch an
update from an authoritative system.

If you use dig against a non-authoritive server, you will notice the ttl
decrements, while from an authoritive server it doesn't.

Leif


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