Configure the DNS server IP acdress (if needed)

If you have a VPN connection, configure the DNS server IP address on the Internet-connected interface of the calling router if either of the following is true: 

• If you use the DNS name of the answering router (instead of its IP address), you must specify the DNS server IP address in the Internet-connected interface of the calling router. Because the Routing and Remote Access Wizard clears the Register this connection’s addresses in DNS check box (on the DNS tab) and selectsDisable NetBIOS over TCP/IP (on the WINS tab), you must configure the DNS server IP address on the VPN Internet-connected interface after you run the wizard.
  
• If the branch office calling router will provide users access to the Internet (in addition to supporting site-to-site traffic to the main office), you must specify the DNS server IP address in the Internet-connected interface of the calling router. For more information about configuring access to the Internet, see "Configure Internet Access Through the Calling Router" later in this chapter.