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User Guide for AIR-104/AIR-204 7-4
Command List
DHCP Commands
The Dynamic Host Control Protocol (DHCP) is a client/server protocol
1
that defines an
efficient and convenient means of dynamically assigning IP addresses and other
networking parameters for a period of time upon request. In an AIR-104/204
environment, this means either the dynamic assignment of private IP addresses to PCs
co-residing on the LAN segment with the AIR-104/204, or a static assignment of these
addresses according to the station identification (the MAC address) of the requesting
client.
Since the SOHO Router is configured with a private IPaddress for its LAN connection,
the DHCP server is automatically enabled. (The DHCP function is disabled if the router
discovers another DHCP server at initialization time, or if the user has explicitly disabled
this function.) DHCP clients residing in LAN-resident machines, such as those running
Windows 95/98, may then request a lease on an IP address from a DHCP server. As the
term implies, the assignment of the address is temporary. The default lease period in a
AIR-104/204 DHCP server is ten hours. The DHCP client is responsible for the renewal of
the lease.
Both static and dynamic DHCP assignments are supported. The range of IP addresses
in the dynamic pool from which the server selects an address to satisfy a request is fixed
and extends from 192.168.168.1 to 192.168.168.229, with the highest available address
being assigned first. Statically assigned addresses must be within this range as well
2
. Up
to 20 static DHCP assignments may be configured and saved.
disable dhcp
Description
: This command disables the Dynamic Host Control Protocol server functions
within the router. The router will no longer respond to lease requests. Existing
leaseholders will not be able to renew their leases after the lease term expires, unless
another DHCP server resides within the network.
enable dhcp
Description
: This command enables the Dynamic Host Control Protocol server
functionality within the router. When enabled, the router will service a client request for IP
address and net mask assignment, as well as assignments of default gateway, and DNS
server addresses. The pool of addresses from which the router selects is between
192.168.xxx.1 and 192.168.xxx.229, inclusive. The default value of xxx is 168, unless re-
configured with the set ip private… command (or its HTTP equivalent). The term of the
lease is 10 hours. The factory default is enabled.
1.The Internet Engineering Task Force (IETF) defines DHCP in RFC-2131 and RFC-
2132.
2. In certain cases, statically assigned addresses may be above this address. Some
AIR-104/204 models may not require this entire range and therefore, static DHCP
assignments from this range may be used.
Chapter 7 Command Line Interface