Configuring The Network Addressing Mode - Cisco ISA500 Series Administration Manual

Networking
Configuring the WAN
Cisco ISA500 Series Integrated Security Appliance Administrator Guide

Configuring the Network Addressing Mode

The security appliance supports five types of network addressing modes.
Specify the network addressing mode for the primary WAN and the secondary
WAN depending on your ISP requirements.
Network Configurations
Addressing
Mode
DHCPC DHCP is the default settting. If you use DHCP, the WAN port will
be the DHCP client and get the IP address from your ISP or the
peer router. Choose DHCP for most of Internet service providers
that use the cable modem.
Choose this option if your ISP automatically assigns you a
dynamic IP address, and enter the following information:
•
•
NOTE
that the MTU values be left as is.
MTU: The Maximum Transmission Unit is the size, in
bytes, of the largest packet that can be passed on.
Choose Auto to use the default MTU size, or choose
Manual if you want to specify another size.
MTU Value: If you choose Manual, enter the custom MTU
size in bytes.
Unless a change is required by your ISP, it is recommended
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