3、负载均衡配置

    命令：

    ip nat pool pool-name start-ip end-ip { netmask netmask | prefix-length prefix-length } type rotary

    ip nat inside destination list access-list-number pool pool-name

    实例：

    access-list 2 permit 10.1.1.127

    ip nat pool real-host 10.1.1.1 10.1.1.3 prefix-length 24 type rotary

    ip nat inside destination list 2 pool real-host

    interface Ethernet 0

    ip address 10.1.1.254 255.255.255.0

    ip nat inside

    interface Serial 0

    ip address 192.168.1.129 255.255.255.0

    ip nat outside

    功效：外部主机通过Serial0接口访问内部虚拟服务器，Cisco IOS防火墙将动态在10.1.1.1~10.1.1.3之间选择一个合适的服务器进行转发，从而实现负载均衡。