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Reverse zone for a /21 ?

Posted on 2008-06-09
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Last Modified: 2010-04-21
Hello everybody,

I have a /21 PI address space .. which I'll soon get master access for ( tomorrow or so ) and I was wondering how would the zone file for ISC's bind/named would look like for a /21 (reverse entries)..  the config file...

Thanks in advance.
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Question by:michaeljohn00
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Chris Dent earned 250 total points
ID: 21749573

Reverse Lookup Zones are Classful only, if it's a Private IP Range you'd be better served by adding a /16 zone. If you wish to split it you'd have to create /24's for each member of the /21.

Any reference to Classless is for Classless delegation which is possible, but is more of a work-around within Classful zones.

HTH

Chris
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Author Comment

by:michaeljohn00
ID: 21749987
So I'll have to add 7 /24 zones for each class in the 21 ?

zone "t.b.a.in-addr.arpa" {
        type master;
        notify no;
        file "zone/a.b.t.zone";
};

zone "u.b.a.in-addr.arpa" {
        type master;
        notify no;
        file "zone/a.b.u.zone";
};

zone "v.b.a.in-addr.arpa" {
        type master;
        notify no;
        file "zone/a.b.v.zone";
};

zone "w.b.a.in-addr.arpa" {
        type master;
        notify no;
        file "zone/a.b.w.zone";
};

.... ?
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Expert Comment

by:Chris Dent
ID: 21750042

Afraid so, yes. Unless you go up and add the single /16 (b.a.in-addr.arpa).

Chris
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Author Comment

by:michaeljohn00
ID: 21750122
any disadvantages if I go to a B class ?
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Expert Comment

by:Chris Dent
ID: 21750169

It makes your DNS server authoritative for the /16 range, that may be a problem if you need to resolve addresses outside of the scopes you've posted above.

If you don't have any other ranges then it's not a problem.

Chris
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Author Comment

by:michaeljohn00
ID: 21750207
no, I'll only need to resolve for my /21 .. I'm not authoritative for any others.
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Author Closing Comment

by:michaeljohn00
ID: 31465600
Thanks again.
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Expert Comment

by:Chris Dent
ID: 21750235

Hmm then it's probably best to add them as /24 zones. Less chance of something going wrong.

The disadvantage of that is it's more effort to manage.

Chris
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Author Comment

by:michaeljohn00
ID: 21750254
Neah, I'll just have to add them once .. I don't plan changing the ptrs daily ! :) I can easily make a shell script or something to generate all the files and stuff ..

how would the container of the zone look like ?

--- got from tldp's dns how to... how should ns.linux.bogus & master.linux.bogus. look like here ?

$TTL 3D
@       IN      SOA     ns.linux.bogus. hostmaster.linux.bogus. (
                        199802151 ; Serial, todays date + todays serial
                        8H      ; Refresh
                        2H      ; Retry
                        4W      ; Expire
                        1D)     ; Minimum TTL
                NS      ns.linux.bogus.

1               PTR     gw.linux.bogus.
2               PTR     ns.linux.bogus.
3               PTR     donald.linux.bogus.
4               PTR     mail.linux.bogus.
5               PTR     ftp.linux.bogus.
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Expert Comment

by:Chris Dent
ID: 21750449

That all looks fine, the NS records are perfect :)

Chris
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Author Comment

by:michaeljohn00
ID: 21751689
might be .. but .. --- got from tldp's dns how to.
. how should ns.linux.bogus & master.linux.bogus. look like here ?
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