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Configuring the WAN
Cisco ISA500 Series Integrated Security Appliances Administration Guide 125
4
Configure a secondary WAN
To configure a secondary WAN (WAN2), click Add. Then use the WAN - Add/Edit
page to configure the connection. If you enabled IPv4/IPv6 routing mode,
complete both tabbed pages, as described for the primary WAN interface. Click
OK to save your settings in the pop-up window. Click Save to apply your settings
to the security appliance. To determine how the two ISP links are used, configure
the WAN redundancy settings. See Configuring WAN Redundancy, page 130.
• If you are having problems with your WAN connection, see Internet
Connection, page 453.
Network Addressing Mode
The security appliance supports five types of network addressing modes. You
need to specify the network addressing mode for the primary WAN and the
secondary WAN depending on your ISP requirements.
NOTE Confirm that you have proper network information from your ISP or a peer router to
configure the security appliance to access the Internet.
Network Addressing
Mode
Configuration
DHCP Client Connection type often used with cable modems. Choose this option if your ISP
dynamically assigns an IP address on connection.
NOTE: Unless a change is required by your ISP, it is recommended 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.