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- From: barrett@lucy.ee.und.ac.za (Alan Barrett)
- Newsgroups: comp.protocols.tcp-ip.domains
- Subject: Re: Bind & Dialup IP
- Message-ID: <1k5ftfINNm50@lucy.ee.und.ac.za>
- Date: 27 Jan 93 08:08:15 GMT
- References: <1jspatINNbqa@hp4at.eunet.co.at>
- Distribution: inet
- Organization: Elec. Eng., Univ. Natal, Durban, S. Africa
- Lines: 36
- NNTP-Posting-Host: lucy.ee.und.ac.za
-
- In article <1jspatINNbqa@hp4at.eunet.co.at>,
- mah@ic.co.at writes:
- > I'm looking for people's experience/opinions/setup recommendations on
- > DNS operation at a dialup-on-demand IP site.
-
- An interesting problem. I have some ideas, but no answers.
-
- > I'd like to have our dialupIP subscribers use DNS, so they can use
- > FQDN's instead of adresses for e.g. ftp. This works fine but has the
- > disadvantage of causing a dialup by nameserver traffic also for other
- > non obvious reasons. E.g. the reverse lookups generated by many
- > applications cause a dialup just for this query.
-
- Most of the isolated systems could be configured to use a single host
- as a forwarder, and this forwarder system could be authoritative for
- all the zones that refer to hosts in the isolated area. That should
- cope with the forward and the in-addr.arpa lookups generated by one of
- the isolated hosts asking about another of the isolated hosts.
-
- > Another aspect: If the subscriber site has an authoritative NS for
- > their zone and we run secondaries, we could do a zone transfer only
- > if the site is connected but not when our nameserver thinks he needs
- > a xfer. We dont want to dial the subscriber in general, and not for a
- > zone xfer in particular.
-
- You could use a wrapper around named-xfer to handle this. Rename
- named-xfer to named-xfer.real, and write a wrapper named-xfer that does
- whatever magic is needed to check whether the desired primary server is
- connected. If it is not connected, then check whether the zone is
- about to expire, and if it is still reasonably fresh then exit with the
- appropriate error status. If the server is connected, or if the zone
- is getting stale, then exec named-xfer.real
-
- --apb
- Alan Barrett, Dept. of Electronic Eng., Univ. of Natal, Durban, South Africa
- RFC822: barrett@ee.und.ac.za
-