Interesting A10 GSLB interop problem

[George Bonser]

> To me it looks like the problem is that the GSLB should return a NOERR
> on the AAAA request with an empty answer. Returning a ERR on a AAAA
> request is wrong if it is only because you don't have a AAAA record.
> (RFC 4074)
> 
> Jan Hugo Prins

That would be acceptable, too, but adding the A record in the additional might result in saving a lookup later.  The point is that if a service doesn't have an IPv6 address, the GSLB unit shouldn't return the fallback CNAME as CNAMEs are common to both IPv4 and IPv6.  It should only return the fallback CNAME if the resource has a V6 address but is down.  If it doesn't have a v6 IP it can't be "broken", it simply needs to be redirected to the v4 IP.