Re: [v6ops] I-D Action: draft-ietf-v6ops-nat64-srv-00.txt

[Philip Homburg <[e-mail]>]

>I would invite commentary on the substance of the draft, which has to do 
>with how one determines the prefix one should use in a CLAT, and 
>proposes a solution in an SRV record. 

Let me summerize this proposal as: take the search list you get in an RA
option (or from DHCPv6), prepend some strings and use that to look up the
NAT64 translation prefix and other information in DNS.

At first glance it seems clever. And certainly RA/DHCPv6 agnostic.

What I'm worried about is overloading the DNS search list with network 
configuration.

Suppose an organisation or ISP has the same search list everywhere but
some networks have NAT64 and others don't (or different networks have different
prefixes).

You can add a dummy name to the search list, but that name will then attract
DNS lookups.

Another question, how robust is the search list. Do CPEs obtain the search list
from the upstream ISP and then announce them downstream?