Cisco 7604 Configuration Guide - Page 179
Configuring DHCP Options, Option Code, Description
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Chapter 8 Configuring IP Routing and DHCP Services Configuring DHCP For example, to assign the range 10.0.1.101 to 10.0.1.110 to hosts connected to the inside interface, enter the following commands: hostname(config)# dhcpd address 10.0.1.101-10.0.1.110 inside hostname(config)# dhcpd dns 209.165.201.2 209.165.202.129 hostname(config)# dhcpd wins 209.165.201.5 hostname(config)# dhcpd lease 3000 hostname(config)# dhcpd domain example.com hostname(config)# dhcpd enable inside Configuring DHCP Options You can configure the FWSM to send information for the DHCP options listed in RFC 2132. The DHCP options fall into one of three categories: • Options that return an IP address. • Options that return a text string. • Options that return a hexadecimal value. The FWSM supports all three categories of DHCP options. To configure a DHCP option, do one of the following: • To configure a DHCP option that returns one or two IP addresses, enter the following command: hostname(config)# dhcpd option code ip addr_1 [addr_2] • To configure a DHCP option that returns a text string, enter the following command: hostname(config)# dhcpd option code ascii text • To configure a DHCP option that returns a hexadecimal value, enter the following command: hostname(config)# dhcpd option code hex value Note The FWSM does not verify that the option type and value that you provide match the expected type and value for the option code as defined in RFC 2132. For example, you can enter dhcpd option 46 ascii hello, and the FWSM accepts the configuration although option 46 is defined in RFC 2132 as expecting a single-digit, hexadecimal value. For more information about the option codes and their associated types and expected values, refer to RFC 2132. Table 8-1 shows the DHCP options that are not supported by the dhcpd option command: Table 8-1 Unsupported DHCP Options Option Code 0 1 12 50 51 Description DHCPOPT_PAD HCPOPT_SUBNET_MASK DHCPOPT_HOST_NAME DHCPOPT_REQUESTED_ADDRESS DHCPOPT_LEASE_TIME OL-20748-01 Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM 8-37
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