reverse zone for < class C???

Michael Kjorling michael at kjorling.com
Fri Jun 29 19:35:23 UTC 2001


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Read RFC 2317 and talk to your ISP. It explains how to do this
properly. For example, here's my setup:

In named.conf:
	zone "192-28.238.88.213.in-addr.arpa" in {
	        type master;
	        file "zones/masters/named.192-28.238.88.213.in-addr.arpa";
	        allow-transfer { slaves; };
	        allow-query { any; };
	};

In zones/masters/named.192-28.238.88.213.in-addr.arpa:
	$ORIGIN 192-28.238.88.213.in-addr.arpa.
	$TTL 1D
	@ IN SOA ulv.mcpoolen.se. hostmaster.mcpoolen.se. (
	        2001062501  ; Serial
	        1H  ; Refresh
	        30M  ; Retry
	        2W  ; Expire
	        1D )  ; Default-TTL
	@ IN NS ulv.mcpoolen.se.
	@ IN NS varg.mcpoolen.se.
	194 IN PTR farkas.mcpoolen.se.
	197 IN PTR ulv.mcpoolen.se.
	200 IN PTR susi.mcpoolen.se.
	201 IN PTR waya.mcpoolen.se.
	204 IN PTR varg.mcpoolen.se.
	206 IN PTR lupus.mcpoolen.se.

My ISP has delegated it like this:
	192-28.238.88.213.in-addr.arpa. 86400 IN NS     ulv.mcpoolen.se.
	192-28.238.88.213.in-addr.arpa. 86400 IN NS     varg.mcpoolen.se.
	192.238.88.213.in-addr.arpa. 86400 IN   CNAME   192.192-28.238.88.213.in-addr.arpa.
	193.238.88.213.in-addr.arpa. 86400 IN   CNAME   193.192-28.238.88.213.in-addr.arpa.
	194.238.88.213.in-addr.arpa. 86400 IN   CNAME   194.192-28.238.88.213.in-addr.arpa.
	; ...

Also, drop the nospam crap. The comp.protocols.dns.bind newsgroup is
gatewayed (two-way) into a mailing list, and stuff like that will
never buy you anything except annoyed people. I have been very active
on this list for the last three months, and never got even one spam
mail because of it.


Michael Kjörling


On Jun 29 2001 12:27 -0500, Q wrote:

> I am trying to setup a reverse zone for half of a class C allocated to us.
> However, I can't seem to get it working.  If I setup the named.conf like:
>
> zone "128.180.188.208.IN-ADDR.ARPA"{
>         type master;
>         file "128.180.188.208.in-addr.arpa";
> };
>
> and the file like:
>
>
> @               IN      SOA     ns1.domain.net.   administrator.domain.net.
> (
>                         2001062902 ; serial
>                         3600 ; refresh
>                         900 ; retry
>                         1209600 ; expire
>                         3600 ; default_ttl
>                         )
> 129             IN      PTR     gw2.domain.net.
> 130             IN      PTR     gw.domain.net.
> 131             IN      PTR     max1.domain.net.
> 163             IN      PTR     news.domain.net.
> 128             IN      NS      ns1.domain.net.
> 128             IN      NS      ns2.domain.net.
>
>
> it will not work at all even on servers that use it for the DNS server.
> However, if I change it to this:
>
>
> zone "180.188.208.IN-ADDR.ARPA"{
>         type master;
>         file "128.180.188.208.in-addr.arpa";
> };
>
>
>
>
> @               IN      SOA     ns1.domain.net.   administrator.domain.net.
> (
>                         2001062902 ; serial
>                         3600 ; refresh
>                         900 ; retry
>                         1209600 ; expire
>                         3600 ; default_ttl
>                         )
> 129             IN      PTR     gw2.domain.net.
> 130             IN      PTR     gw.domain.net.
> 131             IN      PTR     max1.domain.net.
> 163             IN      PTR     news.domain.net.
> @               IN      NS      ns1.domain.net.
> @               IN      NS      ns2.domain.net.
>
> Then it works servers that have it as the DNS server, but of course I am
> telling it that it has the whole class C when it does not.  And if I leave
> it this way, then it does not work remotely when another name server tries
> to do a reverse lookup.  I assume that this is because I technically don't
> have the right zone setup.  Does anyone have any ideas or an example of how
> to setup a reverse zone for half a class C?
>
>

- -- 
Michael Kjörling - michael at kjorling.com - PGP: 8A70E33E
"We must be the change we wish to see" (Mahatma Gandhi)

^..^     Support the wolves in Norway -- go to     ^..^
 \/   http://home.no.net/ulvelist/protest_int.htm   \/


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