I think your suggestion is a good one, and I've now written this section as:
Ok, this is good, but:
Note that IPv6 DNS resolver discovery is not required for dual-stack nodes in dual-stack networks as IPv6 DNS records can be queried over IPv4 as well as IPv6.
While this text is technically correct, some people may take it to mean that it's not necessary to implement DNS discovery, configuration and resolving over IPv6. How about:
Note that in the absense of DNS resolvers reachable over IPv6, either due to failed discovery and/or lack of configuration, DNS resolvers reachable over IPv4 may be used, if available.
BTW: how does a dual-stack host know whether to use v4 or v6 resolvers?
. dnsop resources:_____________________________________________________ web user interface: http://darkwing.uoregon.edu/~llynch/dnsop.html mhonarc archive: http://darkwing.uoregon.edu/~llynch/dnsop/index.html
