Cisco ISA500 Series Administration Manual page 113

Networking
Configuring the WAN
Cisco ISA500 Series Integrated Security Appliance Administrator Guide
Network Configurations
Addressing
Mode
Static IP Choose this option if your ISP assigns you a specific IP address
or a group of addresses. Use the corresponding information
from your ISP to complete the following fields:
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NOTE
that the MTU values be left as is.
IP Address: Enter the IP address of the WAN port that
can be accessable from the Internet.
Netmask: Enter the IP address of the subnet mask.
Gateway: Enter the IP address of default gateway.
DNS0: Enter the IP address of the primary DNS server.
DNS1: Enter the IP address of the secondary DNS server.
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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