Delegating Part Of Class C?
Joseph S D Yao
jsdy at cospo.osis.gov
Wed Jul 21 20:17:27 UTC 1999
One problem is, you're representing the first parts as xxx.xxx.xxx, so
I can't tell whether you are correctly reversing the parts of the IP
address or not.
If I have a subnet 120.110.100.80/29, then my ISP would have reverse
DNS zone:
100.110.120.in-addr.arpa
within which the hostmasters might delegate:
80-29 IN NS name.server.your.domain
; 80 IN CNAME 80.80-29 - network
81 IN CNAME 81.80-29
...
86 IN CNAME 86.80-29
; 87 IN CNAME 87.80-29 - broadcast
I would then have a local domain
80-29.100.110.120.in-addr.arpa
within which I would designate:
81 IN PTR host1.your.domain.
82 IN PTR host2.your.domain.
...
86 IN PTR host6.your.domain.
Now, note: I m u s t let the ISP manage network
100.110.120.in-addr.arpa! And I must have access to external DNS. If
either of these is changed, then I w i l l n o t be able to resolve
[e.g.] 81.100.110.120.in-addr.arpa, which I take it is your current
problem.
But, let's say that we have external DNS, and are NOT pretending to
manage 100.110.120.in-addr.arpa. Then, when we want to resolve
81.100.110.120.in-addr.arpa, we must go back to the root servers [or
however far back] and find that the universally acclaimed authority on
the 100.110.120.in-addr.arpa domain is ... the ISP! The ISP modestly
says, well, yes, but for 81.100.110.120.in-addr.arpa, you must check
under 81.80-29.100.110.120.in-addr.arpa; and, oh, by the way, the
authority for the 80-29.100.110.120.in-addr.arpa domain is
name.server.your.domain ... and then it's over to you.
Capish?
[Incidentally, there is nothing magic about "80-29" except that it
captures the essentials of your subnet. Your provider apparently
prefers to use just "80", which is possibly confusing.]
Where are you in disharmony with this model?
--
Joe Yao jsdy at cospo.osis.gov - Joseph S. D. Yao
COSPO/OSIS Computer Support EMT-B
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