Effects of adding a class-B reverse dns zone?

hi all. easy question hopefully.. have 250 reverse zones, class cs. did analysis , found still doesn't include cs covered our dhcp scopes. instead of adding additional class c zones, i'd create 2 class bs cover ranges being passed out dhcp. question whether have effect on existing class cs, or in other words, more "specific" reverse zones priority queries , dynamic updates, or need create delegations other zones? long-term, i'd collapse cs 2 bs.

for example, suppose have:

10.20.30.in-addr.arpa
12.20.30.in-addr.arpa

what happens if create 20.30.in-addr.arpa? if can reference documentation i'd appreciate it.

thanks!

paul

hi paul,

post.

based on test, assume have 2 host records: abc.domain.com 30.20.10.1 , def.domain.com 30.20.10.1.

if have abc.domain.com 30.20.10.1 in 10.20.30.in-addr.arpa , def.domain.com 30.20.10.1 in 20.30.in-addr.arpa, when nslookup 30.20.10.1, abc.domain.com.

if not have 10.20.30.in-addr.arpa zone, nslookup 30.20.10.1 = def.domain.com.

if have 10.20.30.in-addr.arpa zone, however, no ptr record of 30.20.10.1 in it, nslookup 30.20.10.1 fail.

hope helps.

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jeremy wu
technet community support

Windows Server  >  Network Infrastructure Servers