3Com 812 DNS

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 c an 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 disca rded, and enable flag.

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 transm itted and responses

received from the rem ote servers.

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 attemp ts to find an entry

in its local table s, and if one is n ot found, forwa rds 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 configu re 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, o ne

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 fir s t 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 Remot e 812 so that your changes will be writt en to

permanent FLASH memory.

Contents

Main ii 3Com Corporation 5400 Bayfront Plaza Santa Clara, California 95052-8145 C 1 2 3 4 5 6 Page Page A CONFIGURATION B Page Page Page Page Page Page Page Page Page 1 I Establishing Communications with the OfficeConnect Remote 812 Local Connection IBM-PC Compatible Computers Remote Connection 2 T Command Structure Format Network Address Formats Abbreviation and Command Completion Control Characters Help Conventions Conventions Command Language Terminology Page 3 Quick Setup Instructions QuickVC Setup Instructions Page 4 CLI Quick Setup Script Introduction Instructions Setup Script Page Page Page Page Page Sample Output Display as Quick Setup Executes Page 5 CLI QuickVC Setup Script Page Page Page Page Page 6 Configuration Overview Remote Site Management Page IP Routing Page Page Page Page Address Translation Page DHCP Page DNS Page IPX Routing Page Page Page Bridging Page MAC-Encapsulated Routing Simultaneous Bridging and Routing System Administration Page Introduction Filtering Overview OfficeConnect Remote 812 Filtering Capabilities Page Creating Filters Overview Creating Filters Using Command Line Interface Page Page Page Page Page Page Page Assigning Filters Applying Filters Using CLI Page Managing Filters Using CLI Page Page A CONFIGURATION Page Page Page B CLI Commands ADD add bridge network <network_name> add dns host <host_name> address <IP_address> add filter <filter_name> add framed_route vc <name> Page add ipx route <ipx_net_address> add ipx service [service_name] Page Page add nat tcp vc <user_name> add nat udp vc <vc_name> add network service <service_name> Status add snmp trap_community <name> add syslog <ip_name_or_addr> loglevel [loglevel] add tftp client <ip_name_or_addr> add user [name] password [password] add vc [name] ARP DELETE Page DIAL DISABLE DO ENABLE Page HANGUP HELP HISTORY KILL LIST list active interfaces list bridge forwarding list call events list critical events list facilities list filters list files list interfaces list ip addresses list ip networks list ipx networks list ipx routes list ipx services list networks list ppp list services list snmp communities or list snmp trap_communities list syslog list tcp connections list tftp clients list udp listeners password PAUSED COMMANDS PING ping <ip_name_or_addr> QUICKVC REBOOT RESOLVE resolve name <IP_host_name> SAVE save all SET set date <date> set dhcp mode <mode> set dhcp relay server1 set dhcp relay server2 set dhcp server set dns set facility <facility_name> loglevel [level] set ilmi vpi <number> vci <number> set interface <interface_name> set ip network <name> set ip routing set ipx network <network_name> set ipx system set network service <admin_name> set snmp community <community_name> set system set syslog <IP_address> loglevel [level set time <time > set user <user_name> set vc <vc_name> Page Page set vc <vc_name> atm SHOW Page show bridge network <name> show bridge settings show command show configuration show critical_event settings show date show dhcp relay show dhcp server counters show dhcp server settings show dns counters show dns settings show filter <filter_name> show icmp counters show interface <interface_name> counters show interface <interface_name> show ip counters show ip settings show ip network show ipx counters show ipx network counters show ipx network show ipx rip Page show ppp on interface <name> counters Page show ppp settings show security_option settings show snmp counters show snmp settings show system show telnet show tcp counters show tcp settings TELNET VERIFY TELNET Commands set_escape <string> status CLI Exit Commands Bye, Exit, Leave, Quit Logout Command Features Command Retrieval Page Page A B C D E F G I L M N O P Q R S T U V W 3Com Corporation H S STANDARD WARRANTY S L IMITATION OF L IABILITY FCC C LASS B S FCC DECLARATION OF CONFORMITY