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Dynamic Host Configuration Protocol (DHCP)
Configuring a Router Interface as a DHCP Client
Setting the Interface’s Administrative Distance
In any of the variations of the ip address dhcp command, you can specify the
administrative distance to use when adding the DHCP gateway into the route
table. The ProCurve Secure Router uses the administrative distance to deter-
mine the best route when multiple routes to the same destination exist. The
router assumes that the smaller the administrative distance, the more reliable
the route is. The range is 1 to 255; the default value is 1. For example, to set
an administrative distance of 5, enter:
ProCurve(config-fr 1.101)# ip address dhcp 5
Configuring a Static Hostname for an Interface with a
Dynamic Address
Your organization may have a device behind the ProCurve Secure Router that
remote users should be able to reach. For example, customers may need to
access your Web server.
Often, a Web server’s address is linked to the public IP address on a router
interface using Network Address Translation (NAT). If the router’s interface
changes IP address, the entry for the Web server in the DNS servers’ host tables
will no longer be correct. Users will no longer be able to reach the device.
When an interface receives a dynamic IP address from an ISP, its IP address
may change relatively frequently or without warning. In this situation, you
should run dynamic DNS on the router interface to ensure that customers can
always reach a device when they enter its hostname.
The ProCurve Secure Router supports a client that works with Dynamic
Networking Services, Inc. (DynDNS). After you register a hostname with
DynDNS, the dynamic DNS client automatically informs DynDNS whenever
the associated interface’s IP address changes. DynDNS propagates the change
throughout its DNS servers so that you do not lose connectivity with your
customers.
See Chapter 12: Domain Name System (DNS) Services to learn how to
configure dynamic DNS.
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