PTR records for v6 hosts

[Ron Broersma]

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 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

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