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[idn] Re: My thoughts so far
At 18:14 11.02.00 +0800, James Seng wrote:
>Harald Tveit Alvestrand wrote:
> > I'm not sure - I would think that it was reasonable that if someone asked
> > for a PTR record for 184.108.40.206.in-addr.arpa, the bytes entered into the
> > database by the administrator of the 3.2.1.in-addr.arpa zone would be
> > returned.
>Actually, this is more conseqences then it appears.
>Some.Multilingual.Domain -> IP
>IP -> some.multilingual.domain
>If it is english, seem pretty simple enough since we just do a case
>insenstivity comparsion. But what about multilingual case comparsion?
actually this so-called "security" check is pretty useless in most real
cases; you have to do at least 4 lookups before you can reasonably expect
to have an opinion about whether something is well mapped back or not.
www.alvestrand.no -> CNAME dokka.alvestrand.no
dokka.alvestrand.no -> 220.127.116.11
18.104.22.168 -> dokka.maxware.no
dokka.maxware.no -> 22.214.171.124
It gets progressively worse for routers and other boxes that have many IP
addresses for legitimate reasons, especially if some of their interfaces
have Net-10 addresses, or the admins sincerely don't believe in
So the problem of non-match here might not be terribly interesting, or else
an area where the admin has to take care anyway.
Harald Tveit Alvestrand, EDB Maxware, Norway