3.9 防火墙策略
3.9.1 安全策略、NAT策略
图36 配置防火墙设备拓扑图
配置步骤:为防火墙与外网相连的接口G1/0/1,G1/0/2配置相应的接口地址,然后将接口加入相应的安全区域,再为防火墙配置安全策略,为防火墙加上NAT策略,需要在防火墙上根据NAT地址规划表配置NAT地址池,并配置源NAT策略。
FW5的配置:
interface GigabitEthernet1/0/1
undo shutdown
ip address 59.39.177.2 255.255.255.248
#
interface GigabitEthernet1/0/2
undo shutdown
ip address 58.252.2.210 255.255.255.248
firewall zone name isp1 id 4
set priority 6
add interface GigabitEthernet1/0/1
#
firewall zone name isp2 id 5
set priority 7
add interface GigabitEthernet1/0/2
nat address-group isp1 0
mode pat
section 0 59.39.177.5 59.39.177.6
#
nat address-group isp2 1
mode pat
section 0 58.252.2.211 58.252.2.212
nat-policy
rule name nat
source-zone trust
destination-zone isp1
rule name nat2
source-zone trust
destination-zone isp2
FW6的配置:
firewall zone name isp1 id 4
set priority 6
add interface GigabitEthernet1/0/1
#
firewall zone name isp2 id 5
set priority 7
add interface GigabitEthernet1/0/2
nat address-group isp1 0
mode pat
section 0 59.39.178.5 59.39.178.6
#
nat address-group isp2 1
mode pat
section 0 58.252.1.211 58.252.1.212
#
multi-interface
mode proportion-of-weight
nat-policy
rule name ipsec
source-zone trust
destination-zone isp2
action no-nat
rule name nat
source-zone trust
destination-zone isp1
rule name nat2
source-zone trust
destination-zone isp2
3.9.2 IP-link联动默认路由
配置步骤:在FW5上开启IP-link功能,创建名为ISP1的ip-link,配置待检测目的地址为59.39.177.1,创建名为ISP2的ip-link,配置待检测目的地址为58.252.2.209,配置ISP1的静态路由59.39.177.1,如果ip-link探测isp1链路失效,则这条路由失效,切换至备用路由。配置ISP2的静态路由58.252.2.209,如果ip-link探测isp2链路失效,则这条路由失效,切换至备用路由。
在FW6上开启IP-link功能,创建名为ISP1的ip-link,配置待检测目的地址为59.39.178.1,创建名为ISP2的ip-link,配置待检测目的地址为58.252.1.209,配置ISP1的静态路由59.39.178.1,如果ip-link探测isp1链路失效,则这条路由失效,切换至备用路由。配置ISP2的静态路由58.252.1.209,如果ip-link探测isp2链路失效,则这条路由失效,切换至备用路由。
FW5配置命令:
ip route-static 0.0.0.0 0.0.0.0 59.39.177.1 preference 50 track ip-link isp1
ip route-static 0.0.0.0 0.0.0.0 58.252.2.209 track ip-link isp2
#
FW6配置命令:
ip route-static 0.0.0.0 0.0.0.0 59.39.178.1 preference 50 track ip-link isp1
ip route-static 0.0.0.0 0.0.0.0 58.252.2.209track ip-link isp2
#
IP-link联动默认路由