zone file question
Mark_Andrews at isc.org
Mark_Andrews at isc.org
Sat Jan 18 11:29:08 UTC 2003
>
> I have a question about the generic zones listed in RFC1912. The RFC
> explains that two zones, 0.in-addr.arpa and 255.in-addr.arpa, should
> always be set up to prevent queries of the network and broadcast
> addresses from 'escaping' into the internet and hitting a root name server.
>
> My question is; if my network is a classless network, should the two
> zones still be called as above or should they match the network and
> broadcast addresses of my network?
>
> So, if my IP address space is 192.168.20/27 with a network address of
> 192.168.20.64 and a broadcast address of 192.168.20.95, should the two
> zones be called 64.in-addr.arpa and 95.in-addr.arpa?
No. 0.0.0.0 is still used by machines that don't know their
address and 255.255.255.255 is a valid broadcast address on
all networks. The purpose of those zones is to catch reverse
lookups on those addresses. 0.in-addr.arpa catches reverse
lookups on 0.x.x.x and 255.in-addr.arpa catches reverse lookups
on 255.x.x.x. Note these are the first (not last) octets of
the addresses.
However you should have a zone for the address range you are
using. Since you don't have a full /24 you should look at
RFC 2317 and choose a method along with your address provider.
64.20.168.192.in-addra.arpa and 95.20.168.192.in-addra.arpa
are the start and end of this address range in the in-addr.arpa
space.
Mark
>
> Andrew
>
--
Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark.Andrews at isc.org
More information about the bind-users
mailing list