Cisco Systems ISA550

Networking

Configuring the WAN

Cisco ISA500 Series Integrated Security Appliances Administration Guide 125

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, page130.

• 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. Cho ose this option if your ISP

dynamically assigns an IP address on connection.

NOTE: Unless a cha nge is require d by your ISP, it is reco mmended tha t 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.