diff between "option domainname" and "ddns-domainname" ?

Simon Hobson dhcp at thehobsons.co.uk
Mon Jun 5 17:40:29 UTC 2006

At 16:14 +0000 5/6/06, David W. Hankins wrote:

>  > why the host declarations is being updated in dns while using 
>>  why not while using option domain-name

>This is the default config, assuming interim style ddns updates:
>char std_nsupdate [] = " 
>option server.ddns-hostname = 
>   pick (option fqdn.hostname, option host-name); 
>option server.ddns-domainname = config-option domain-name; 
>option server.ddns-ttl = encode-int(lease-time / 2, 32); 
>option server.ddns-rev-domainname = \"in-addr.arpa.\";";
>'option' is derived from the cache of options supplied by the client.
>'config-option' is derived from the server's cache of configuration
>state (options it supplies to the client).

So the server ignores any domain name supplied by the client - which 
means it cannot so an update unless ddns-domainname is specified. It 
makes sense not to use any fqdn supplied by the client, since the 
client can request the server to let it do it's own A record update.


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