exactly - as long as the PTR record exists and returns a FQHN with a resolvable and identical A record, rfc1912 seems satisfied. back to the thread, I wouldn't feel comfortable with using PTR nonexistence (or otherwise) to prove that an address is no longer used. After all, that address *is* about to be used (hence the problem). In other words, you'd have to violate rfc1912 on an authoritative nameserver (of all devices to violate it on) just to prove re-use. -[ Joshua Goodall ]----------------------------------------------- -[ IP Systems Architect ]---------------- Cook, Geek, Lover ------ -[ joshuag@interxion.com ]--------------- joshua@roughtrade.net -- On Fri, 18 Aug 2000, Derek J. Balling wrote:
www ---> 10.0.0.2 ns1 ---> 10.0.0.2 servershostname ---> 10.0.0.2
10.0.0.2 ---> servershostname.domain.com
I think this is the situation Joshua is describing, where you might rev-map to a server name (Whatever hostnames you assign locally to your boxen), but where that hostname is NOT "ns1.domain.com")