Reverse lookups not working when Internet connection failed.

[Matus UHLAR - fantomas]

On 05.11.22 09:58, David Alexandre M. de Carvalho via bind-users wrote:
>Thank you all for the replies.
>For what I understand after reading your replies (I might be wrong :) ), reverse lookups fail when I have no outgoing
>connection because some caching or or transfer is needed  from 66.136.193.in-addr.arpa. , wich I don't control. This
>is divided in several networks, 2 of them under my control.

correct. Admin of that zone is supposed to:

1.  create proper CNAME records:

0.66.136.193.in-addr.arpa. CNAME 0.0-28.66.136.193.in-addr.arpa. 
...
15.66.136.193.in-addr.arpa. CNAME 15.0-28.66.136.193.in-addr.arpa.

2. delegate 0-28.66.136.193.in-addr.arpa. to your servers, make their 
servers secondary for this zone (optional)

3. allow your servers to to fetch 66.136.193.in-addr.arpa.

step 1. creates proper aliases
step 2. creates working delegation
step 3. allows you to see reverse records when your connection is down.

alternatively they can choose to 0/28.66.136.193.in-addr.arpa. or 0-15.66.136.193.in-addr.arpa.
instead of 0-28.66.136.193.in-addr.arpa.

>I'll have to read more carefully your suggestions to see if I find an 
>alternative way to achieve this only by modifying my zone files, without 
>messing up my current setup.  I'll let you know how it goes.

>> On 11/4/22 2:07 PM, Mark Andrews wrote:
>>> Any ISP that offers these delegations should be allowing their
>>> customers to transfer the zone that contains the CNAMEs for the
>>> customer address space by default.
>>
>> I've had enough trouble getting ISPs to support 2317 delegation period.
>> I think that asking them to allow me to do a zone transfer would have
>> been a hard no.
>>
>> I certainly don't think this would be allowed /by/ /default/.
>>
>> I just checked and § 5.1 of RFC 2317 mentioned having the parent do a
>> secondary zone transfer of the child zone.  But I don't see any mention
>> of the child doing a secondary zone transfer of the parent zone.
>>
>> I think that would be a good idea.
-- 
Matus UHLAR - fantomas, uhlar at fantomas.sk ; http://www.fantomas.sk/
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