On Wed, 29 May 2002 15:05:39 +0200, Gert Doering <gert@space.net> said:
Hi, On Wed, May 29, 2002 at 11:12:55AM +0200, Alexander Gall wrote:
?: Software currently relies on ip6.int - you can't just switch it off. ?: Can't we just duplicate the delegation-records? GD: A good solution would be a CNAME very high in the hierarchy
I don't think that you can do this with CNAME. A CNAME is only honoured when it's found where the RR of the original query (typically a PTR for a complete inverse IPv6 address in this case) is expected. I suppose you simply get a NXDOMAIN if there's a CNAME higher up in that branch.
I heave heard a number of "I think, I don't think, I suppose" statements on this, but no hard facts from the RFCs or code from common resolver libraries.
Ok, I forgot about wildcards <shudder>. With a wildcard, you can actually have a server return such a CNAME. However, whatever you specify as the target of the CNAME is static. To "redirect" an entire branch of the DNS tree, you need to modify the original query before you restart it. That's why DNAME had to change the algorithms of RFC1034, sections 4.3.2 and 5.3.3. Am I missing something? -- Alex
This is why there is an action item on the NCC to find out whether this would work.
(Of course one could aways set up a proxy that answers every request with a terminal CNAME, but that's equally ugly)
Gert Doering -- NetMaster -- Total number of prefixes smaller than registry allocations: 45201 (45114)
SpaceNet AG Mail: netmaster@Space.Net Joseph-Dollinger-Bogen 14 Tel : +49-89-32356-0 80807 Muenchen Fax : +49-89-32356-299
-- ___________ SWITCH - The Swiss Academic and Research Network ___________ Alexander Gall, SWITCH, Limmatquai 138, CH-8001 Zurich, Switzerland gall@switch.ch Tel: +41 1 268 1522 Fax: +41 1 268 1568