Branch Gateway supports the following DNS resolver features:

• Supports IPv4 and IPv6 — it can resolve a hostname to IPv4 and IPv6 addresses.

• Fully compliant with RFC1034, RFC1035, and RFC1123

• Maintains a global DNS database for all interfaces. The database is compiled using:

  • Static (user-defined) DNS servers

  • Automatically-learned DNS servers. DNS servers can be automatically learned by the FastEthernet 10/2 interface when it is configured as a DHCP client or configured for PPP.

    Note:

    The following PPP interfaces can be configured to automatically learn the DNS servers in the system:

    • FastEthernet with PPPoE

    • Dialer interface

    • Serial interface

    The most common application of this configuration is for connecting Branch Gateway to the Internet and getting the DNS server information from the ISP. Therefore, interfaces configured to automatically learn the DNS servers in the system are usually the FastEthernet with PPPoE interface and the Dialer interface.