HP ProLiant DL320 G4 Server - Manual (Page 29)

Network services support 29
Network services support
In this section
DNS server............................................................................................................................................ 29
DHCP server .......................................................................................................................................... 29
DNS server
The ProLiant DL320 Security Server depends on a DNS server to resolve Internet host names. To provide
DNS server support for the server, use:
• Your ISP DNS server
• Your own DNS server on the internal network
• A caching-only DNS server on the ProLiant DL320 Security Server
• A caching-only DNS server on a perimeter network segment
The simplest approach is to use your ISP DNS server. During the ProLiant DL320 Security Server setup
process, set the DNS server address used by the ProLiant DL320 Security Server to use the IP address of
the ISP DNS server to resolve Internet host names. If using a dial-up connection to connect to the Internet,
your ISP automatically assigns both an IP address and a DNS server address to your dial-up interface. The
drawback of using only the ISP DNS server is that DNS cannot be used to resolve computer names on the
internal network.
If a DNS server already exists on the internal network, use it to resolve Internet host names. All Active
Directory domains require at least one DNS server and use that DNS server to resolve Internet host names
for your internal network clients. Configure the internal interface of the ProLiant DL320 Security Server to
use this DNS server after configuring the internal network DNS server to resolve Internet names.
A caching-only DNS server does not contain DNS zone or domain information. Instead, it queries other
DNS servers on the Internet for the IP address of a given host, and then caches the result before
forwarding the answer to the computer requesting the name resolution. A caching-only DNS server can be
installed on the ProLiant DL320 Security Server, and then the server can be configured to use itself as its
DNS server.
Another caching-only DNS server solution takes advantage of a perimeter network configuration. If the
ProLiant DL320 Security Server has three or more network interfaces, one of the network interfaces can be
connected to a perimeter network. A caching-only DNS server can be installed and configured on the
perimeter network. If a DNS server exists on the internal network, it can be configured to use the
perimeter network DNS server as a forwarder.
For more information on DNS setup and configuration, see the Microsoft ® Windows Server™ 2003 Help
and Support Center or the Microsoft ® Windows ® 2000 Help.
DHCP server
A DHCP server assigns IP addresses to computers configured as DHCP clients. In a typical ProLiant DL320
Security Server configuration, the DHCP server assigns addresses to computers on the internal network
and the VPN Clients network. The DHCP server itself can be located on: