Firstly, you can tell nslookup to make AAAA queries “nslookup -query=aaaa”.
nslookup is a really old tool which is why it make A queries by default. It predates even the concept of IPv6 (which dates from ~1995). The same also applies to dig which is slightly younger than nslookup. Secondly, I would look at other mechanisms than DNS64/NAT64 to provide IPv4 as-a-service. It really has a lot of issues which the other mechanisms don’t. Thirdly, I wouldn’t rush to running IPv6-only. It does have its advantages but they come with serious drawbacks. At this stage IPv6-only is still niche only. DS-Lite, MAP-T, MAP-E, 464XLAT are all alternatives to running DNS64/NAT64. Mark > On 12 Apr 2018, at 9:26 am, Mark Boolootian <boo...@ucsc.edu> wrote: > >>> As far as I know, a host with on an IPv6 address is only ever >>> going to perform AAAA lookups. I'd be very interested to know >>> if there are cases where that isn't true. >> >> Well, if you run nslookup or dig -t a, you're asking for A records >> explicitly. > > Ah, true that. Does nslookup do that by default? > >> OK, fair enough. If you ask a DNS64 server for an A record, it should still >> give you back an A record. If you ask for an AAAA RR, then you will get >> back an >> AAAA record, even if it has to synthesize an A record into a 6-in-4 IPv6 >> address. > > Yes. And this was what seemed weird about the original > question. In my experience, an IPv6 only host (and IPv6 > only means no routable v4 address - so you might have > 169.254, but nothing else) only emits AAAA lookups. But > maybe I need to look more carefully. I'm working towards > building an IPv6 only environment here, and my (often > erroneous) thinking presupposes certain behavior. > > cheers, > mark > _______________________________________________ > Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe > from this list > > bind-users mailing list > bind-users@lists.isc.org > https://lists.isc.org/mailman/listinfo/bind-users -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org _______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
