3Com OfficeConnect 3CP4144, Cli User'S Manual

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DNS 6-13
show dhcp server counters
list dhcp server leases
The DHCP Server configuration is displayed with the show dhcp server settings
command.
Configuring the DHCP
Relay
The OfficeConnect Remote 812 can relay DHCP requests to up to two Remote
Servers.
The OfficeConnect Remote 812 DHCP relay can be configured with two Remote
Server entries. Each entry consists of a server IP address, a specified maximum
number of hops a request can take before being discarded, and enable flag.
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The following commands are used to configure the entries:
set dhcp mode relay
set dhcp relay server1 <ip address> max_hops <count> enabled [YES | NO]
set dhcp relay server2 <ip address> max_hops <count> enabled [YES | NO]
Monitoring the DHCP
Relay
The DHCP relay has one command which displays the configuration and related
counters. Counters include the number of requests transmitted and responses
received from the remote servers.
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To show the configuration, use the command:
show dhcp relay
DNS
A Domain Name Server (DNS) provides an IP address for a host computer for a
given Domain Name. A DNS Proxy receives requests and attempts to find an entry
in its local tables, and if one is not found, forwards the request to a remote server.
The remote DNS Server can be learned dynamically through PPP or can be
statically assigned.
The OfficeConnect Remote 812’s DNS Proxy enables you to configure remote DNS
Servers for specific Domains. For instance, assume you have two remote sites
configured, one to the Internet and the other to a corporate site which has a
domain name of 3com.com. Two DNS remote servers can be configured, one
which uses the corporate site for 3com.com and the other to use the Internet as
the default.
The OfficeConnect Remote 812’s DNS Proxy also enables you to configure Static
Host entries. The static table is checked first before the DNS request is forwarded
on to the remote server. If the OfficeConnect Remote 812 was first booted in
DHCP Smart Mode, an entry,
ocrdsl-3com.com , was automatically added to the
table which maps to the OfficeConnect Remote 812’s local LAN IP address. This
entry was added to simplify access to the OfficeConnect Remote 812.
Remember to save your configuration using the save all command before
rebooting your OfficeConnect Remote 812 so that your changes will be written to
permanent FLASH memory.