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Old 11-09-2006, 04:47 PM   #1
a2vr6
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How to make a PTR record dynamic


I was wondering if someone tell me how to update a PTR record so that it can dynamically get updated from the A record located on another NS?
 
Old 11-09-2006, 07:47 PM   #2
cjcox
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Assuming you are authoritative for the reverse zone.. in my
case... 168.192.in-addr.arpa. And assuming you have set
your named.conf so that you can do dynamic updates somehow.
And let's assume the name of the host is testit.mydomain.com
and it has the address of 192.168.44.100, then the following
would add a PTR record...

$ nsupdate ...your options here...
zone 44.168.192.in-addr.arpa.
update delete 100.44.168.192.in-addr.arpa PTR
update add 100.44.168.192.in-addr.arpa 86400 PTR testit.mydomain.com.
send

The "...your options here..." part might contain your update key info.. or you can send it in as a command using key KEY_NAME KEY_VALUE to the nsupdate command.
 
Old 11-10-2006, 10:46 AM   #3
a2vr6
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Quote:
Originally Posted by cjcox
Assuming you are authoritative for the reverse zone.. in my
case... 168.192.in-addr.arpa. And assuming you have set
your named.conf so that you can do dynamic updates somehow.
And let's assume the name of the host is testit.mydomain.com
and it has the address of 192.168.44.100, then the following
would add a PTR record...

$ nsupdate ...your options here...
zone 44.168.192.in-addr.arpa.
update delete 100.44.168.192.in-addr.arpa PTR
update add 100.44.168.192.in-addr.arpa 86400 PTR testit.mydomain.com.
send

The "...your options here..." part might contain your update key info.. or you can send it in as a command using key KEY_NAME KEY_VALUE to the nsupdate command.

Shouldn't the IP point to the users Name Server?
 
Old 11-10-2006, 12:19 PM   #4
cjcox
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In the case I mentioned, I'm assuming you are running your own DNS and have update permissions to it. If not, it's VERY unlikely that you'll be able to update somebody else's DNS, especially with regards to the in-addr.arpa information.

The in-addr.arpa entry defines the "IP" and points to the A record name.

But... I'm not sure if we're understanding each other very well.
 
Old 11-10-2006, 12:40 PM   #5
a2vr6
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Quote:
Originally Posted by cjcox
In the case I mentioned, I'm assuming you are running your own DNS and have update permissions to it. If not, it's VERY unlikely that you'll be able to update somebody else's DNS, especially with regards to the in-addr.arpa information.

The in-addr.arpa entry defines the "IP" and points to the A record name.

But... I'm not sure if we're understanding each other very well.

I do have update permissions on our name server. What I would like to have the following example done.

User requested that the IP they own dynamically get updated by the name servers THEY own. So basically I need to know what would go into the line below:

10 IN PTR dns1(or NS1?).whatever.com. (??) <---does the the users name server go in there or is it more complicated?


Sorry for being such a newbie, I only have basic DNS skills.
 
Old 11-10-2006, 01:10 PM   #6
a2vr6
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This is what I found in the DNS/BIND cookbook regarding reverse delegation.

"To delegate the 1.168.192.in-addr.arpa subdomain to the name servers ns1.baz.bar.example and ns2.foo.example, you'd add these two NS records to the 168.192.in.addr.arpa zone date file.

1.168.192.in-addr.arpa IN NS ns1ns1baz.bar.example.

1.168.192.in-addr.arpa IN NS ns2.foo.example.
 
  


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