Reverse for a /23
Joseph S D Yao
jsdy at cospo.osis.gov
Wed Dec 22 02:06:14 UTC 1999
On Tue, Dec 21, 1999 at 06:05:51PM -0500, Stephen Amadei wrote:
> O.K... I haven't been able to get ahold of a up to date Cricket book...
> (mine is revision 1) and I have read RFC2317... but I am still having
> nothing but problems doing reverse for a supernet... in this case, a /23.
>
> I am feeling really stupid and need someone to explain this to me step by
> step... ;-)
>
> I am running BIND 8.1.2 and lets say I am trying to set up reverse for
> 192.168.218.0/23 (192.168.218.0/24 and 192.168.219.0/24).
>
> I put in my named.conf:
>
> zone "218/23.168.192.in-addr.arpa" {
> type master;
> file "db.192.168.218";
> };
>
> And I put in db.192.168.218:
>
> 218/23.251.204.in-addr.arpa. IN SOA ns.our.net someone.our.net (
> 1999121701 ;Serial
> 10800 ;Refresh after 3 hours
> 3600 ;Retry after 1 hour
> 604800 ;Expire after 1 week
> 86400 ) ;Minimum TTL of 1 day
>
> 218/23.251.204.in-addr.arpa. IN NS ns.our.net.
> 218/23.251.204.in-addr.arpa. IN NS ns2.our.net.
>
> 1.218.251.204.in-addr.arpa. IN PTR blah.our.net.
> 129.218.251.204.in-addr.arpa. IN PTR blah2.our.net.
> 1.219.251.204.in-addr.arpa. IN PTR blah3.our.net.
> 22.219.251.204.in-addr.arpa. IN PTR blah4.our.net.
>
> When I HUP BIND, it just gets all upset and drops the whole zone.
>
> Maybe I've read RFC2317 totally wrong, but the bottom line is I'm confused
> over the whole situation.
>
> ----Steve
> Stephen Amadei
> Systems Admin
> Dandy.NET
> Atlantic City, NJ
More recent versions of DNS are much more strict about what they will
allow as a domain name. They will only allow characters in a domain
name that are also valid in a host name. So "/" is out.
HOWEVER, why bother with all this? Why not just implement the two
reverse-DNS zones 218.168.192.in-addr.arpa and 219.168.192.in-addr.arpa?
Get your copy from Amazon, or readmedotdoc.com, or bookpool.com, or
linuxmall.com, or somewhere. They even deliver to A.C. ;-)
--
Joe Yao jsdy at cospo.osis.gov - Joseph S. D. Yao
COSPO/OSIS Computer Support EMT-B
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