Re: ip6.int

[David Woodhouse <dwmw2 infradead org>]

On Sat, 2004-08-14 at 19:26 +0300, Pekka Savola wrote:
> On Sat, 14 Aug 2004, Daniel Roesen wrote:
> > Ideally, glibc should do:
> > 
> > - nibble format in ip6.arpa
> > if that doesn't succeed:
> > - nibble format in ip6.int
> 
> Or even just forgo ip6.int altogether.  If ip6.int doesn't work
> properly (causing delays), and isn't needed anymore, we shouldn't even
> bother trying it.
> 
> But I don't have strong objections either way, as long as ip6.arpa is 
> tried first.

ip6.arpa _is_ tried first, and when we get NXDomain we fall back to
ip6.int. Some seconds later, ip6.arpa eventually fails too..

12:47:16.775500 IP 192.168.0.4.1035 > 192.168.0.1.domain:  9506+ PTR? 1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.2.a.9.2.9.5.d.2.0.0.2.ip6.arpa. (90)
12:47:16.775879 IP 192.168.0.1.domain > 192.168.0.4.1035:  9506 NXDomain 0/1/0 (151)
12:47:16.776241 IP 192.168.0.4.1035 > 192.168.0.1.domain:  9507+ PTR? 1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.2.a.9.2.9.5.d.2.0.0.2.ip6.int. (89)
12:47:21.776076 IP 192.168.0.4.1035 > 192.168.0.1.domain:  9507+ PTR? 1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.2.a.9.2.9.5.d.2.0.0.2.ip6.int. (89)
12:47:24.310993 IP 192.168.0.1.domain > 192.168.0.4.1035:  9507 ServFail 0/0/0 (89)
12:47:24.311068 IP 192.168.0.1.domain > 192.168.0.4.1035:  9507 ServFail 0/0/0 (89)

Since ip6.int is has been deprecated for three years and since it
actually appears to be _dead_ I suspect we gain little by disabling its
use. We could, perhaps, have an option in resolv.conf to _enable_ the
fallback to ip6.int, rather than the current option which _disables_
such?

-- 
dwmw2