how to configure dns slave

One more thing, you can see examples here:
http://www.zytrax.com/books/dns/ch6/

Redimido is right.

Regards, Tobias

Sir, Thank you very much , little more help please as per the below request

In the Hub location behind the firewall/router Ubuntu DDNS is serving as the master name sever for the network of   192.168.1.0/24 subnet, named configuration is attached for your reference.

1. HUB 192.168.1.0/24 and 192.168.1.244 as ddns server
With reference to the attached configuration please help me what additional statements or changes to be made for achieving the DNS slave as per the below different subnet at the spoke

2. spoke 192.168.11.0/24 subnet  and dns slave 192.168.11.100
Please tell me what all the statements required here at spoke I mean how the named.conf.local should be configured, i am little confused should point to the master server , please give me the statements .
namedconfig.txt

on the  named.conf  the statement is  masters {192.168.2.7; 10.2.3.15 port 1127; 2001:db8:0:1::15;};

I did not understand the   2001:db8:0:1::15; which is in masters above statement. Please help me.

masters {192.168.2.7; 10.2.3.15 port 1127; 2001:db8:0:1::15;};

This is a IPv6 address. You don't have to use a IPv6 address if you don't want to.

masters {192.168.2.7; 10.2.3.15 port 1127; 2001:db8:0:1::15;};

This is an example of specifying a port if a DNS server uses a non-standard port.

You could use this format (replace the IP with your master DNS):

masters {192.168.2.7;};

Regards, Tobias

Sir, Thanks , can you please tell me can will it be possible configure salve for different network  i,e 192.168.10. when the master is in the  192.168.1. network. Please help

Yes, it's no problem to have the slave in a different network, as long as you can reach it from your master server. You could use ping to verify that you can reach your slave DNS from your master DNS (if you have allowed ping in your network).

Regards, Tobias

Sir thank you very much, finally one last request, In the master server is it required to create a slave zones ( forward and reverse zone files), please suggest.

dns master and slave