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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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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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Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

 

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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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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If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

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