In message <8738o2poov.fsf@nemi.mork.no>, =?utf-8?Q?Bj=C3=B8rn_Mork?= writes:
Mark Andrews <marka@isc.org> writes:
Actually you just need to *let* the hosts update their own ptr records using UPDATE.
People keep saying the PTR records don't mean anything yet still demand really strong authentication for updates of PTR records. TCP is more than a strong enough authenticator to support update from self.
You can even delegate the reverse zone when doing or just after a PD.
* Accept NS/DNAME updates for the reverse prefix from any address in the delegated address range over TCP. This avoids having a temporatially lame delegation. named already has code to do this for /48's as I coded it to to support 6to4.
This sounded like an excellent idea at first, but then I started thinking: As a home user, would I really want to give anyone with access to my network the right to change my reverse delegation?
Yet this is essentially what 6to4 has been doing for years. See RFC 5158. Sometimes good enough is all that is needed. One could add a KEY record at the same time as you add the NS/DNAME records and use SIG(0) to authenticate subsequent updates to the delegation based on that key. The DHCP server would clear delegations on new PD presumably using a TSIG signed UPDATE request. if no sig0 then allow update tcp-6to4 if self-signed the allow update if this tsig then allow update Named already has the concepts of "this tsig", "self-signed", "tcp-6to4". It doesn't have the concept of "no sig0" but adding this sort of thing is relatively straight forward. A third method would be for the CPE could send a KEY record rdata in the DHCP PD request that the DHCP server which would add to the zone with a owner name based on the allocated prefix. SIG(0) would then be used to authenticate further update requests at or below this name. This is just bolting together existing technologies in more useful ways. Mark
I don't think so. I am not even sure I would want them all to be able to update the PTR record for the addresses they use.
Bj=C3=B8rn -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: marka@isc.org