Juniper SRX策略路由总结

1、路由实例

路由实例是路由表、接口和路由协议参数的集合。通过设置接口及路由协议各种参数可以形成路由实例的路由表。

每个路由实例都有自己的实例名称，并且各自维护一张独立的路由表。

全局路由其实也是一个路由实例，其实例名称为inet.0。

2、普通静态策略路由（只做策略，不作NAT转换）

设置包括如下步骤：

1）设置应用接口子接口，定义为服务区域的入接口/出接口

2）定义路由实例，实例类型为forwarding，实例路由表

3）定义过滤器firewall filter

4）定义接口路由组rib-group；

5）将接口路由组导入到全局路由表及路由实例的路由表中；

6）在内网接口应用过滤器filter

3、做NAT的静态策略路由（既做策略又做NAT转换）

注意：

1）该情况下需要试用virtual-router类型的路由实例

2）每个virtual-router维护一张独立的路由表

配置实例拓扑图

达到目的：

默认内网主机上网走CNC 2M链路访问公网，指定的PC走CNC 50M链路访问外网

实现思路：

默认内网所有主机通过全局路由表inet.0走CNC 2M链路出局访问公网，部分指定的PC通过Juniper SRX的FBF路由策略走路由实例的路由表出局访问公网

设置步骤如下：

1）定义服务区域zone

配置示例：

set security zones security-zone lt host-inbound-traffic system-services all

set security zones security-zone lt host-inbound-traffic protocols all

2）设置应用接口子接口，定义为服务区域的入接口/出接口

配置示例：

set security zones security-zone lt interfaces ge-0/0/2.0 host-inbound-traffic system-services all

set security zones security-zone lt interfaces ge-0/0/2.0 host-inbound-traffic protocols all

3）定义路由实例，路由实例数量可根据接入的ISP线路数量来定义。实例类型为virtual-router，VR的虚拟接口，VR的路由表

配置示例：

set routing-instances CNC50M instance-type virtual-router

set routing-instances CNC50M interface ge-0/0/2.0

set routing-instances CNC50M routing-options static route 0.0.0.0/0 next-hop XX.XX.XX.XX  ##指向ISP提供的公网网关

4）定义NAT的相关映射rule-set、rule，策略policy、address-book、application等

√Source NAT的rule-set 配置示例：

set security nat source rule-set CNC50M-snat-internet from zone trust

set security nat source rule-set CNC50M-snat-internet to zone lt

set security nat source rule-set CNC50M-snat-internet rule CNC50M-inside-to-outside match source-address 0.0.0.0/0

set security nat source rule-set CNC50M-snat-internet rule CNC50M-inside-to-outside match destination-address 0.0.0.0/0

set security nat source rule-set CNC50M-snat-internet rule CNC50M-inside-to-outside then source-nat interface

√ 策略policy 配置示例：

set security policies from-zone trust to-zone lt policy CNC50M-snat-internet match source-address CBGZ-out-norestrict

set security policies from-zone trust to-zone lt policy CNC50M-snat-internet match destination-address any

set security policies from-zone trust to-zone lt policy CNC50M-snat-internet match application any

set security policies from-zone trust to-zone lt policy CNC50M-snat-internet then permit

set security policies from-zone trust to-zone lt policy CNC50M-snat-internet then log session-init

set security policies from-zone trust to-zone lt policy CNC50M-snat-internet then log session-close

5）定义过滤器filter

配置示例：

set firewall family inet filter filter-1 term LAN_term from destination-address 172.16.0.0/16

set firewall family inet filter filter-1 term LAN_term from destination-address 172.20.0.0/16

set firewall family inet filter filter-1 term LAN_term from destination-address 192.168.0.0/16

set firewall family inet filter filter-1 term LAN_term then accept     ##允许内网PC互访，不作以上配置将会导致网关为此防火墙内网接口的PC无法访问内网其他PC。

##指定的PC从CNC 50M链路出局访问公网

set firewall family inet filter filter-1 term CNC50M_term from source-address 172.16.29.25/32

set firewall family inet filter filter-1 term CNC50M_term from source-address 172.16.29.251/32

set firewall family inet filter filter-1 term CNC50M_term from source-address 172.16.28.166/32

set firewall family inet filter filter-1 term CNC50M_term from source-address 172.16.28.137/32

set firewall family inet filter filter-1 term CNC50M_term from source-address 172.16.28.139/32

set firewall family inet filter filter-1 term CNC50M_term from source-address 172.16.28.138/32

set firewall family inet filter filter-1 term CNC50M_term then routing-instance CNC50M

set firewall family inet filter filter-1 term default then accept ##对于filter的其他数据，采取默认动作accept（接受）

6）定义接口路由组

配置示例：

set routing-options interface-routes rib-group inet INSIDE

7）将接口路由组导入到全局路由表及实例的路由表中

配置示例：

set routing-options rib-groups INSIDE import-rib inet.0

set routing-options rib-groups INSIDE import-rib CNC50M.inet.0

set routing-options rib-groups INSIDE import-rib default.inet.0

8）在内网接口应用相应的过滤器filter

set interfaces ge-0/0/0 unit 0 family inet filter input filter-1

4、普通静态策略路由与NAT转换的策略路由之间的区别

路由实例类型不同：

普通静态策略路由类型：forwarding

NAT转换的策略路由类型：virtual-router

参考链接：http://www.docin.com/p-598358767.html