LC with DNS server !

Hi all

 

I 've a problem with DNS in LC.

 

I have a DNS server: 172.30.1.10.

 

And LS self'IP is: internal 172.30.1.1; external: 220.231.x.x

 

My Wipe IP is : baovviet.com

 

I need config LC is DNS server, which anwers DNS request baovviet.com is 220.231.x.x and with other DNS request, LC will forward them to DNS server 172.30.1.10.

 

I create DNS 's ip: 172.30.1.10 in BIND Forwarder Server List but it not work.

 

I test:

 

nslookup

 

server 220.231.x.x

 

cisco.com

 

 

It not work.

 

Help me, plz.

 

TC