Handing out DNS server from Cisco local pool

[Chad Kissinger]

This leads to a question that I still have about choosing appropriate Interface IDs... how do you choose a range of Interface IDs that haven't been reserved already (for Stateless Autoconfig, etc.)? 

As far as I can tell, you only need to unset the 71st and 72nd bits and not use all 0s for the Interface ID.. this would translate into choosing an Interface ID that met the following conditions:

1.  The second hexadecimal character in the Interface ID should be 0, 4, 8 or c
2.  The entire Interface ID shouldn't be all 0s.  

Is this accurate, or am I missing something.  The issue of how to choose an appropriate Interface ID for manual configuration or for a DHCP pool seems to be completely unaddressed in everything I read about IPv6.  


chad kissinger  |  founder-vp  |  onramp access, llc 
p: 512.322.9200  |  f: 512.476.2878  |  www.onr.com
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-----Original Message-----
From: ipv6-ops-bounces+chad=onr.com at lists.cluenet.de [mailto:ipv6-ops-bounces+chad=onr.com at lists.cluenet.de] On Behalf Of Frank Bulk
Sent: Monday, March 21, 2011 3:56 PM
To: ipv6-ops at lists.cluenet.de
Subject: Handing out DNS server from Cisco local pool

If I want to hand out an IPv6 DNS server via Cisco's local pool for the WAN
interface, how is that done?

With IPv4 it's just a:
interface Virtual-Template1
 ppp ipcp dns <IP 1> <IP 2>

With IPv6 it's supposed to run DHCPv6 over the WAN link, and Cisco's "local
pool" command hands out IPv6 addresses very nicely:
ipv6 local pool ipv6pool-lns <IPv6>::/56 65

but there appears to be no way to specify the DNSv6 address(es).

Frank