PTR records for v6 hosts

[Stig Venaas]

Hi Ron

Ron Broersma wrote:
> 
> On Aug 30, 2009, at 8:42 AM, Seth Mattinen wrote:
> 
>> I'm curious as to how everyone is doing PTR records in DNS for their v6
>> hosts. Are you just letting autoconf hosts go without? Do you manually
>> create one once you know what it's autoconf address will be? Or do you
>> use DHCP with a predefined pool that's easy to create a PTR range for?
> 
> We wrote a tool that regularly polls the routers, grabs the ARP and ND 
> tables (using appropriate snmp MIBs), looks for all the global unicast 
> IPv6 addresses in the list, and then using their MAC address we map to 
> the associated IPv4 address, then use that to look up the IPv4 PTR 
> record in DNS, then use that to build an IPv6 PTR record and use dynamic 
> DNS update to update the zone (with various optimizations such as 
> caching, garbage collection, etc).   That works well for us (dealing 

I've written the exact same tool :)

Stig

> with thousands of v6 hosts on our net), although there are challenges 
> with differences in how each vendor implements the v6 MIBs, and churn 
> from those horrible privacy/temporary addresses [RFCs 3041, 4941] that 
> that all Microsoft OS's enable by default).  This, of course, is 
> assuming each host has some amount of IPv4 and IPv6 activity, but in 
> reality it works just fine over time.
> 
> --Ron
>