场景
你是公司的网络管理员。公司总部的网络分成了三个区域，包括内部区域（Trust）、外部区域（Untrust）和服务器区域（DMZ）。你设计通过防火墙来实现对数据的控制，确保公司内部网络安全，并通过DMZ区域对外网提供服务。
拓扑图
步骤一. 基本配置与IP编址
给路由器和防火墙配置地址，并配置静态路由，在交换机上配置VLAN。
＜Huawei＞system-view
[Huawei]sysname R1
[R1]interface GigabitEthernet 0/0/1
[R1-GigabitEthernet0/0/1]ip address 10.0.10.1 24
[R1-GigabitEthernet0/0/1]quit
[R1]interface loopback 0
[R1-LoopBack0]ip address 10.0.1.1 24
＜Huawei＞system-view
[Huawei]sysname R2
[R2]interface GigabitEthernet0/0/1
[R2-GigabitEthernet0/0/1]ip address 10.0.20.1 24
[R2-GigabitEthernet0/0/1]quit
[R2]interface loopback 0
[R2-LoopBack0]ip address 10.0.2.2 24
＜Huawei＞system-view
[Huawei]sysname R3
[R3]interface GigabitEthernet 0/0/1
[R3-GigabitEthernet0/0/1]ip address 10.0.30.1 24
[R3-GigabitEthernet0/0/1]quit
[R3]interface loopback 0
[R3-LoopBack0]ip address 10.0.3.3 24
防火墙默认会启用GigabitEthernet0/0/0接口的ip地址，为避免干扰，可以删除。
＜Huawei＞system-view
[USG6300]sysname FW
[FW]int GigabitEthernet 0/0/0
[FW-GigabitEthernet0/0/0]undo ip address
[FW-GigabitEthernet0/0/0]quit
[FW]interface GigabitEthernet 1/0/0
[FW-GigabitEthernet1/0/0]ip address 10.0.10.254 24
[FW-GigabitEthernet1/0/0]quit
[FW]interface GigabitEthernet 1/0/1
[FW-GigabitEthernet1/0/1]ip address 10.0.20.254 24
[FW-GigabitEthernet1/0/1]quit
[FW]interface GigabitEthernet 1/0/2
[FW-GigabitEthernet1/0/2]ip address 10.0.30.254 24
[FW-GigabitEthernet1/0/2]quit
交换机上需要按照需求定义VLAN。
[Quidway]sysname S1
[S1]vlan batch 11 to 13
[S1]interface GigabitEthernet 0/0/1
[S1-GigabitEthernet0/0/1]port link-type access
[S1-GigabitEthernet0/0/1]port default vlan 11
[S1-GigabitEthernet0/0/1]quit
[S1]interface GigabitEthernet 0/0/2
[S1-GigabitEthernet0/0/2]port link-type access
[S1-GigabitEthernet0/0/2]port default vlan 12
[S1-GigabitEthernet0/0/2]quit
[S1]interface GigabitEthernet 0/0/3
[S1-GigabitEthernet0/0/3]port link-type access
[S1-GigabitEthernet0/0/3]port default vlan 13
[S1-GigabitEthernet0/0/3]quit
[S1]interface GigabitEthernet 0/0/21
[S1-GigabitEthernet0/0/21]port link-type access
[S1-GigabitEthernet0/0/21]port default vlan 11
[S1-GigabitEthernet0/0/21]quit
[S1]interface GigabitEthernet 0/0/22
[S1-GigabitEthernet0/0/22]port link-type access
[S1-GigabitEthernet0/0/22]port default vlan 12
[S1-GigabitEthernet0/0/22]quit
[S1]interface GigabitEthernet 0/0/23
[S1-GigabitEthernet0/0/23]port link-type access
[S1-GigabitEthernet0/0/23]port default vlan 13
在R1、R2和R3上配置缺省路由，在FW上配置明确的静态路由，实现三个Loopback0接口连接的网段之间路由畅通。
[R1]ip route-static 0.0.0.0 0 10.0.10.254
[R2]ip route-static 0.0.0.0 0 10.0.20.254
[R3]ip route-static 0.0.0.0 0 10.0.30.254
[FW]ip route-static 10.0.1.0 24 10.0.10.1
[FW]ip route-static 10.0.2.0 24 10.0.20.1
[FW]ip route-static 10.0.3.0 24 10.0.30.1
配置完成后检查防火墙路由信息。
[FW]display ip routing-table
步骤二.配置防火墙区域
防火墙上默认有四个区域，分别是“local“、”trust“、”untrust“、”dmz“。实验中我们使用到“trust“、”untrust“和”dmz“三个区域，分别将对应接口加入各安全区域，由于默认配置将GE0/0/0加入了“trust”区域，为避免干扰，将其删除。
[FW]firewall zone dmz
[FW-zone-dmz]add interface GigabitEthernet 1/0/2
[FW-zone-dmz]quit
[FW]firewall zone trust
[FW-zone-trust]add interface GigabitEthernet 1/0/1
[FW-zone-trust]undo add interface GigabitEthernet 0/0/0
[FW-zone-trust]quit
[FW]firewall zone untrust
[FW-zone-untrust]add interface GigabitEthernet 1/0/0
[FW-zone-untrust]quit
检查各接口所在的区域：
[FW]display zone interface
local
trust
interface of the zone is (1):
GigabitEthernet1/0/1
untrust
interface of the zone is (1):
GigabitEthernet1/0/0
dmz
interface of the zone is (1):
GigabitEthernet1/0/2
检查各区域的优先级：
[FW]display zone
local
priority is 100
trust
priority is 85
interface of the zone is (1):
GigabitEthernet1/0/1
untrust
priority is 5
interface of the zone is (1):
GigabitEthernet1/0/0
dmz
priority is 50
interface of the zone is (1):
GigabitEthernet1/0/2
可以看到三个接口已经被划分到相应的区域内，默认情况下不同区域间是不可互通的。因此，此时各路由器之间流量是无法通过的，需要配置区域间的安全策略放行允许通过的流量。
步骤三.配置安全策略
如果防火墙域间没有配置安全策略，或查找安全策略时，所有的安全策略都没有命中，则默认执行域间的缺省包过滤动作（拒绝通过）。配置安全策略，仅允许Trust区域访问其他区域，不允许其他区域之间的访问。
[FW]security-policy
[FW-policy-security]rule name policy_sec_1
[FW-policy-security-rule-policy_sec_1]source-zone trust
[FW-policy-security-rule-policy_sec_1]destination-zone untrust
[FW-policy-security-rule-policy_sec_1]action permit
[FW-policy-security-rule-policy_sec_1]quit
[FW-policy-security]rule name policy_sec_2
[FW-policy-security-rule-policy_sec_2]source-zone trust
[FW-policy-security-rule-policy_sec_2]destination-zone dmz
[FW-policy-security-rule-policy_sec_2]action permit
[FW-policy-security-rule-policy_sec_2]quit
[FW-policy-security]quit
检查配置结果：
[FW]display security-policy rule policy_sec_1
(0 times matched)
rule name policy_sec_1
source-zone trust
destination-zone untrust
action permit
[FW]display security-policy rule policy_sec_2
(0 times matched)
rule name policy_sec_2
source-zone trust
destination-zone dmz
action permit
检查从trust到untrust和dmz的连通性：
[R2]ping -a 10.0.2.2 10.0.1.1
PING 10.0.1.1: 56 data bytes, press CTRL_C to break
Reply from 10.0.1.1: bytes=56 Sequence=1 ttl=254 time=1 ms
Reply from 10.0.1.1: bytes=56 Sequence=2 ttl=254 time=1 ms
Reply from 10.0.1.1: bytes=56 Sequence=3 ttl=254 time=1 ms
Reply from 10.0.1.1: bytes=56 Sequence=4 ttl=254 time=1 ms
Reply from 10.0.1.1: bytes=56 Sequence=5 ttl=254 time=1 ms
— 10.0.1.1 ping statistics —
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 1/1/1 ms
[R2]ping -a 10.0.2.2 10.0.3.3
PING 10.0.3.3: 56 data bytes, press CTRL_C to break
Reply from 10.0.3.3: bytes=56 Sequence=1 ttl=254 time=1 ms
Reply from 10.0.3.3: bytes=56 Sequence=2 ttl=254 time=1 ms
Reply from 10.0.3.3: bytes=56 Sequence=3 ttl=254 time=1 ms
Reply from 10.0.3.3: bytes=56 Sequence=4 ttl=254 time=1 ms
Reply from 10.0.3.3: bytes=56 Sequence=5 ttl=254 time=1 ms
— 10.0.3.3 ping statistics —
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 1/1/1 ms
检查从untrust到trust和dmz的连通性：
[R1]ping -a 10.0.1.1 10.0.2.2
PING 10.0.2.2: 56 data bytes, press CTRL_C to break
Request time out
Request time out
Request time out
Request time out
Request time out
— 10.0.2.2 ping statistics —
5 packet(s) transmitted
0 packet(s) received
100.00% packet loss
[R1]ping -a 10.0.1.1 10.0.3.3
PING 10.0.3.3: 56 data bytes, press CTRL_C to break
Request time out
Request time out
Request time out
Request time out
Request time out
— 10.0.3.3 ping statistics —
5 packet(s) transmitted
0 packet(s) received
100.00% packet loss
检查从dmz到untrust和trust的连通性：
[R3]ping -a 10.0.3.3 10.0.1.1
PING 10.0.1.1: 56 data bytes, press CTRL_C to break
Request time out
Request time out
Request time out
Request time out
Request time out
— 10.0.1.1 ping statistics —
5 packet(s) transmitted
0 packet(s) received
100.00% packet loss
[R3]ping -a 10.0.3.3 10.0.2.2
PING 10.0.2.2: 56 data bytes, press CTRL_C to break
Request time out
Request time out
Request time out
Request time out
Request time out
— 10.0.2.2 ping statistics —
5 packet(s) transmitted
0 packet(s) received
100.00% packet loss
经过验证，以trust区域为源的数据可以访问untrust和dmz，但以其他区域为源的数据不能互访。
配置域间包过滤策略，允许Untrust区域访问DMZ区域的特定服务器。
DMZ区域有一台服务器，IP地址为10.0.3.3，需要对Untrust区域开放Telnet服务。同时为了测试网络，需要开放ICMP Ping测试功能。
[FW]security-policy
[FW-policy-security]rule name policy_sec_3
[FW-policy-security-rule-policy_sec_3]source-zone untrust
[FW-policy-security-rule-policy_sec_3]destination-zone dmz
[FW-policy-security-rule-policy_sec_3]destination-address 10.0.3.3 mask 255.255.255.255
（注：若是不配置以上这条命令，则10.0.3.3和10.0.30.1都可以访问；配置这条命令，就只能访问这个地址。）
[FW-policy-security-rule-policy_sec_3]service icmp
[FW-policy-security-rule-policy_sec_3]service telnet
[FW-policy-security-rule-policy_sec_3]action permit
为了能在进行Telnet测试，在R3上开启Telnet功能。
[R3]telnet server enable
[R3]aaa
[R3-aaa]local-user test password irreversible-cipher [email protected]
[R3-aaa]local-user test service-type telnet
[R3-aaa]quit
[R3]user-interface vty 0 4
[R3-ui-vty0-4]authentication-mode aaa
[R3-ui-vty0-4]protocol inbound telnet
测试从R1(untrust)到R3(dmz)的ping和telnet：
ping 10.0.3.3
PING 10.0.3.3: 56 data bytes, press CTRL_C to break
Reply from 10.0.3.3: bytes=56 Sequence=1 ttl=254 time=1 ms
Reply from 10.0.3.3: bytes=56 Sequence=2 ttl=254 time=1 ms
Reply from 10.0.3.3: bytes=56 Sequence=3 ttl=254 time=1 ms
Reply from 10.0.3.3: bytes=56 Sequence=4 ttl=254 time=1 ms
Reply from 10.0.3.3: bytes=56 Sequence=5 ttl=254 time=1 ms
— 10.0.3.3 ping statistics —
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 1/1/1 ms
ping 10.0.30.1
PING 10.0.30.1: 56 data bytes, press CTRL_C to break
Request time out
Request time out
Request time out
Request time out
Request time out
— 10.0.30.1 ping statistics —
5 packet(s) transmitted
0 packet(s) received
100.00% packet loss
telnet 10.0.3.3
<R1＞telnet 10.0.30.1
Press CTRL_] to quit telnet mode
Trying 10.0.30.1 …
Error: Can’t connect to the remote host
根据验证可知，只有访问指定地址的ICMP和telnet可以通过，其他流量全部禁止。