Question about RFC-2317
Clenna Lumina
savagebeaste at yahoo.com
Thu Jan 4 09:43:35 UTC 2007
I was reading about RFC-2317
(http://www.ietf.org/rfc/rfc2317.txt, found via google... is
there a newer one?)
While I feel I have grasped a lot about DNS/Bind the past
couple months (enough to setup zones for my LAN and started
to manage a couple external domains I've since had deligated
to me), I can't see understand one part in this RFC document.
On page 2 (and 3) it shwos a nice example of how to partition
a class C address space into chunks (in that case, starting
from 192.0.2.0, /25, /26, and /26
I understand that CNAMing in the parent zone is needed,
acccording to this RFC.
What I can't seem to figure out for the life of me is *why*
this is needed?
(Example parent zone from RFC-2317)
---------------------------------------
$ORIGIN 2.0.192.in-addr.arpa.
@ IN SOA my-ns.my.domain.
hostmaster.my.domain. (...)
;...
; <<0-127>> /25
0/25 NS ns.A.domain.
0/25 NS some.other.name.server.
;
1 CNAME 1.0/25.2.0.192.in-addr.arpa.
2 CNAME 2.0/25.2.0.192.in-addr.arpa.
3 CNAME 3.0/25.2.0.192.in-addr.arpa.
;
; <<128-191>> /26
128/26 NS ns.B.domain.
128/26 NS some.other.name.server.too.
;
129 CNAME 129.128/26.2.0.192.in-addr.arpa.
130 CNAME 130.128/26.2.0.192.in-addr.arpa.
131 CNAME 131.128/26.2.0.192.in-addr.arpa.
;
; <<192-255>> /26
192/26 NS ns.C.domain.
192/26 NS some.other.third.name.server.
;
193 CNAME 193.192/26.2.0.192.in-addr.arpa.
194 CNAME 194.192/26.2.0.192.in-addr.arpa.
195 CNAME 195.192/26.2.0.192.in-addr.arpa.
---------------------------------------
It doesn't seem to make sense with the NS entries pointing to
the name servers that those chunks (/lengths) are being
deligated to. Wouldn't each respective NS server(s) handle it
instead. The CNAME is just an alias, right, so is it needed
here? As a fall back messure? Unless I've missed something,
the RFC doesn't seem to expalin that.
Thanks.
__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com
More information about the bind-users
mailing list