Non-Octet Boundary Delegation (RFC 4183)

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On Thu, Sep 22, 2011 at 10:58 AM, Simon Hobson <dhcp1 at thehobsons.co.uk> wrote:
> A: Because it messes up the order in which people normally read text.
> Q: Why is top-posting such a bad thing?
> A: Top-posting.
> Q: What is the most annoying thing in e-mail?
>
>
> Stas wrote:
>>
>> Thank you Simon, thank you Andris.
>>
>> Andris, problem is that in that case I will need to use "nslookup
>> 68.27.133.10.ptr-pa.lan.orga.ru instead of "nslookup 10.133.27.68" to
>> get DNS record.
>
> You **ALWAYS** lookup by the normal IP - eg dig -x 10.133.27.68
> That results in a lookup of 68.27.133.10.in-addr.arpa.
>
> The trick is that instead of that being a PTR to some FQDN, it is a pointer
> to 68.27.133.10.ptr-pa.lan.orga.ru.
> Ie, in the 27.133.10.in-addr.arpa zone there'll be a record
> 68 PTR 68.27.133.10.ptr-pa.lan.orga.ru.
>
> Then in the ptr-pa.lan.orga.ru zone, you have an entry dynamically created
> by DHCP which is "68.27.133.10. PTR <some fqdn>".
>
> It's some time since I played with this, but I recall it "just works" -
> looking again at RFC 4183, I certainly didn't do it that way. But I'm happy
> to be corrected if I'm wrong.
>
> --
> Simon Hobson
>
> Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
> author Gladys Hobson. Novels - poetry - short stories - ideal as
> Christmas stocking fillers. Some available as e-books.
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>

I went though the RFC 2317 and tried to configure bind and dhcpd in
some ways but I didn't reach appropriate result.

I need to have reverse records for 10.133.24.0/21 (from 10.133.24.1 to
10.133.31.254) been resolved by our dns server but other networks (all
of 10.0.0.0/8 except of 10.133.24.0/21) need to be resolved by
upstream DNS server and I'm not sure how it's possible to configure
BIND + DHCPD for it.

In case I use configuration suggested by Andris it doesn't resolve
names by IP addresses.
nslookup 10.133.27.68
Server:		172.27.1.10
Address:	172.27.1.10#53

** server can't find 68.27.133.10.in-addr.arpa.: NXDOMAIN


Stas