how t orestrict nsupdate to a single A or PTR record ?

fddi fddi at
Wed Dec 5 19:29:06 UTC 2012

Hello, I have a domain called

I would need a way to allow access with nsupdate not to the entire 
but only to specific hosts and specific IP Address do be modified using 

here is my config

zone "" IN {
         type master;
         allow-query { any; };
         file "";
         update-policy {
                 grant mykey. subdomain A TXT CNAME;

but in this way anyone can modify any hosts in the domain.
How can I restrict and allow to modify only specific hosts ?

for example I would like to restrict to modify only 
with a given key.

is it possibile ?

thank you


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