策略路由实现多ISP接入Internet

news2024/9/23 1:29:39

组网需求：

企业分别从ISP1和ISP2租用了一条链路

PC3用户上网访问Server1时走ISP1
PC4用户上网访问Server1时走ISP2

拓扑图

一、ISP1 运营商 R1路由器

<Huawei>sys
[Huawei]sys R1
[R1]un in en

[R1]int g0/0/0
[R1-GigabitEthernet0/0/0]ip addr 2.2.2.2 24
[R1-GigabitEthernet0/0/0]quit

[R1]int g0/0/1
[R1-GigabitEthernet0/0/1]ip addr 10.2.2.2 24
[R1-GigabitEthernet0/0/1]quit

# 配置OSPF
[R1]ospf 1
[R1-ospf-1]area 0
[R1-ospf-1-area-0.0.0.0]network 10.2.2.0 0.0.0.255
[R1-ospf-1-area-0.0.0.0]network 2.2.2.0 0.0.0.255

二、ISP2 运营商 R2路由器

<Huawei>sys
[Huawei]sys R2
[R2]un in en

[R2]int g0/0/0
[R2-GigabitEthernet0/0/0]ip addr 3.3.3.3 24
[R2-GigabitEthernet0/0/0]quit

[R2]
[R2]int g0/0/1
[R2-GigabitEthernet0/0/1]ip addr 10.3.3.3 24
[R2-GigabitEthernet0/0/1]quit

# 配置OSPF
[R2]ospf 1
[R2-ospf-1]area 0
[R2-ospf-1-area-0.0.0.0]network 10.3.3.0 0.0.0.255
[R2-ospf-1-area-0.0.0.0]network 3.3.3.0 0.0.0.255

三、R6路由器

<Huawei>sys
[Huawei]sys R6
[R6]un in en

[R6]int g0/0/0
[R6-GigabitEthernet0/0/0]ip addr 10.2.2.1 24
[R6-GigabitEthernet0/0/0]quit

[R6]int g0/0/1
[R6-GigabitEthernet0/0/1]ip addr 10.3.3.1 24
[R6-GigabitEthernet0/0/1]quit

[R6]int g0/0/2
[R6-GigabitEthernet0/0/2]ip addr 10.1.1.1 24
[R6-GigabitEthernet0/0/2]quit

# 配置OSPF
[R6]ospf 1
[R6-ospf-1]area 0
[R6-ospf-1-area-0.0.0.0]network 10.1.1.0 0.0.0.255
[R6-ospf-1-area-0.0.0.0]network 10.2.2.0 0.0.0.255
[R6-ospf-1-area-0.0.0.0]network 10.3.3.0 0.0.0.255

四、防火墙

1、配置接口IP并加入相应的安全区域

<USG6000V1>sys
[USG6000V1]sys FW1
[FW1]un in en
[FW1]dhcp enable

# 桥接本地环回网卡，实现登陆WEB管理页面
[FW1]int g0/0/0
[FW1-GigabitEthernet0/0/0]undo ip addr 192.168.0.1 24
[FW1-GigabitEthernet0/0/0]ip addr 192.168.137.10 24
[FW1-GigabitEthernet0/0/0]service-manage all permit
[FW1-GigabitEthernet0/0/0]quit

[FW1]int g1/0/0
[FW1-GigabitEthernet1/0/0]ip addr 2.2.2.1 24
[FW1-GigabitEthernet1/0/0]service-manage all permit
[FW1-GigabitEthernet1/0/0]quit

[FW1]int g1/0/1
[FW1-GigabitEthernet1/0/1]ip addr 3.3.3.1 24
[FW1-GigabitEthernet1/0/1]service-manage all permit
[FW1-GigabitEthernet1/0/1]quit

[FW1]firewall zone untrust
[FW1-zone-untrust]add int g1/0/0
[FW1-zone-untrust]add int g1/0/1
[FW1-zone-untrust]quit

[FW1]int g1/0/2
[FW1-GigabitEthernet1/0/2]ip addr 172.16.1.1 24
[FW1-GigabitEthernet1/0/2]service-manage all permit
[FW1-GigabitEthernet1/0/2]dhcp select int
[FW1-GigabitEthernet1/0/2]quit

[FW1]int g1/0/3
[FW1-GigabitEthernet1/0/3]ip addr 172.16.2.1 24
[FW1-GigabitEthernet1/0/3]service-manage all permit
[FW1-GigabitEthernet1/0/3]dhcp select int
[FW1-GigabitEthernet1/0/3]quit

[FW1]firewall zone trust
[FW1-zone-trust]add int g1/0/2
[FW1-zone-trust]add int g1/0/3
[FW1-zone-trust]quit

2、创建地址列表

[FW1]ip address-set 172.16.1.* type object
[FW1-object-address-set-172.16.1.*]address 0 172.16.1.0 mask 24
[FW1-object-address-set-172.16.1.*]ip address-set 172.16.2.* type object
[FW1-object-address-set-172.16.2.*]address 0 172.16.2.0 mask 24
[FW1-object-address-set-172.16.2.*]quit

3、配置安全策略

[FW1]security-policy
[FW1-policy-security]rule name "untrust to local"
[FW1-policy-security-rule-untrust to local]source-zone untrust
[FW1-policy-security-rule-untrust to local]destination-zone local
[FW1-policy-security-rule-untrust to local]action permit

[FW1-policy-security-rule-untrust to local]rule name "local to untrust"
[FW1-policy-security-rule-local to untrust]source-zone local
[FW1-policy-security-rule-local to untrust]destination-zone untrust
[FW1-policy-security-rule-local to untrust]action permit

[FW1-policy-security-rule-local to untrust]rule name "trust to untrust"
[FW1-policy-security-rule-trust to untrust]source-zone trust
[FW1-policy-security-rule-trust to untrust]destination-zone untrust
[FW1-policy-security-rule-trust to untrust]source-address address-set 172.16.1.*
[FW1-policy-security-rule-trust to untrust]source-address address-set 172.16.2.*
[FW1-policy-security-rule-trust to untrust]action permit
[FW1-policy-security-rule-trust to untrust]quit

4、配置NAT策略

[FW1-policy-security]nat-policy

[FW1-policy-nat]rule name "snat 1"
[FW1-policy-nat-rule-snat 1]source-zone trust
[FW1-policy-nat-rule-snat 1]egress-interface GigabitEthernet1/0/0
[FW1-policy-nat-rule-snat 1]source-address address-set 172.16.1.*
[FW1-policy-nat-rule-snat 1]action source-nat easy-ip

[FW1-policy-nat-rule-snat 1]rule name "snat 2"
[FW1-policy-nat-rule-snat 2]source-zone trust
[FW1-policy-nat-rule-snat 2]egress-interface GigabitEthernet1/0/1
[FW1-policy-nat-rule-snat 2]source-address address-set 172.16.2.*
[FW1-policy-nat-rule-snat 2]action source-nat easy-ip
[FW1-policy-nat-rule-snat 2]quit

5、配置策略路由

[FW1]policy-based-route
[FW1-policy-pbr]rule name "no policy route 1" 3
[FW1-policy-pbr-rule-no policy route 1]ingress-interface GigabitEthernet1/0/2
[FW1-policy-pbr-rule-no policy route 1]source-address address-set 172.16.1.*
[FW1-policy-pbr-rule-no policy route 1]destination-address address-set 172.16.2.*
[FW1-policy-pbr-rule-no policy route 1]action no-pbr

[FW1-policy-pbr]rule name "no policy route 2" 4
[FW1-policy-pbr-rule-no policy route 2]ingress-interface GigabitEthernet1/0/3
[FW1-policy-pbr-rule-no policy route 2]source-address address-set 172.16.2.*
[FW1-policy-pbr-rule-no policy route 2]destination-address address-set 172.16.1.*
[FW1-policy-pbr-rule-no policy route 2]action no-pbr

[FW1-policy-pbr-rule-no policy route 2]rule name "policy route 1" 1
[FW1-policy-pbr-rule-policy route 1]ingress-interface GigabitEthernet1/0/2
[FW1-policy-pbr-rule-policy route 1]source-address address-set 172.16.1.*
[FW1-policy-pbr-rule-policy route 1]action pbr egress-interface GigabitEthernet1/0/0 next-hop 2.2.2.2

[FW1-policy-pbr-rule-policy route 1]rule name "policy route 2" 2
[FW1-policy-pbr-rule-policy route 2]ingress-interface GigabitEthernet1/0/3
[FW1-policy-pbr-rule-policy route 2]source-address address-set 172.16.2.*
[FW1-policy-pbr-rule-policy route 2]action pbr egress-interface GigabitEthernet1/0/1 next-hop 3.3.3.3
[FW1-policy-pbr-rule-policy route 2]quit

6、配置OSPF

[FW1-policy-nat]ospf 1
[FW1-ospf-1]area 0
[FW1-ospf-1-area-0.0.0.0]network 2.2.2.0 0.0.0.255
[FW1-ospf-1-area-0.0.0.0]network 3.3.3.0 0.0.0.255
[FW1-ospf-1-area-0.0.0.0]network 172.16.1.0 0.0.0.255
[FW1-ospf-1-area-0.0.0.0]network 172.16.2.0 0.0.0.255

五、WEB 端查看

1、接口列表

2、安全策略

（1）untrust to local

（2）local to untrust

（3）trust to untrust

3、NAT策略

（1）snat 1

（2）snat 2

4、地址表

5、策略路由

（1）policy route 1

（2）policy route 2

（3）no policy route 1

（4）no policy route 4

六、测试

1、PC3 访问 Server1

PC4 访问 Server1

通过上图分析得知，PC3 所在的172.16.1.0网段访问 10.1.1.2 时出接口为 GE1/0/0。PC4 所在的172.16.2.0网段访问 10.1.1.2 时出接口为 GE1/0/1

2、我们拿 PC3 访问 PC4，看下内网是否正常

PC3>ping 172.16.2.81

Ping 172.16.2.81: 32 data bytes, Press Ctrl_C to break
From 172.16.2.81: bytes=32 seq=1 ttl=127 time=63 ms
From 172.16.2.81: bytes=32 seq=2 ttl=127 time=62 ms
From 172.16.2.81: bytes=32 seq=3 ttl=127 time=63 ms
From 172.16.2.81: bytes=32 seq=4 ttl=127 time=46 ms
From 172.16.2.81: bytes=32 seq=5 ttl=127 time=47 ms

--- 172.16.2.81 ping statistics ---
  5 packet(s) transmitted
  5 packet(s) received
  0.00% packet loss
  round-trip min/avg/max = 46/56/63 ms