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USG防火墙中的NAT配置，很多新手对此不是很清楚，为了帮助大家解决这个难题，下面小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。
USG防火墙 NAT配置
学习目的
掌握在USG防火墙上配置NATServer的方法
掌握在USG防火墙上配置NATEasy IP的方法
拓扑图
场景：
你是公司的网络管理员。公司使用网络防火墙隔离成三个区域。现在要将DMZ区域中的一台服务器（IP地址：10.0.3.3）提供的telnet服务发布出去，对外公开的地址是10.0.10.20、24.并且内部网络Trust区域的用户通过Easy-IP的方式访问外部区域。其它方向的访问被禁止。
在交换机上将G0/0/1与G0/0/21接口定义到vlan11，将G0/0/2与G0/0/22接口定义到vlan12，将G0/0/3与G0/0/23接口定义到vlan13.分别规划了三个网段。
学习任务
步骤一.基本配置与IP编址
首先给三个路由器配置地址信息。
[Huawei]sysname R1
[R1]interface g0/0/1
[R1-GigabitEthernet0/0/1]ip add 10.0.10.124
[R1-GigabitEthernet0/0/1]desc this portconnect to S1-G0/0/1
[R1-GigabitEthernet0/0/1]interfaceloopback0
[R1-LoopBack0]ip add 10.0.1.1 24
[R1-LoopBack0]q
[Huawei]sysname R2
[R2]interface g0/0/1
[R2-GigabitEthernet0/0/1]ip add 10.0.20.224
[R2-GigabitEthernet0/0/1]desc this portconnect to S1-G0/0/2
[R2-GigabitEthernet0/0/1]interfaceloopback0
[R2-LoopBack0]ip add 10.0.2.2 24
[R2-LoopBack0]q
[Huawei]sysname R3
[R3]interface g0/0/1
[R3-GigabitEthernet0/0/1]ip add 10.0.30.324
[R3-GigabitEthernet0/0/1]desc this portconnect to S1-G0/0/3
[R3-GigabitEthernet0/0/1]interfaceloopback0
[R3-LoopBack0]ip add 10.0.3.3 24
[R3-LoopBack0]q
给防火墙配置地址时，G0/0/1配置10.0.20.254/24.
[SRG]sysname FW
13:06:03 2014/07/08
[FW]interface g0/0/1
13:06:30 2014/07/08
[FW-GigabitEthernet0/0/1]ip add 10.0.20.25424
13:07:01 2014/07/08
[FW-GigabitEthernet0/0/1]desc this portconnect to S1-G0/0/22
13:07:52 2014/07/08
[FW-GigabitEthernet0/0/1]interface g0/0/0
13:08:23 2014/07/08
[FW-GigabitEthernet0/0/0]dis this
13:08:31 2014/07/08
#
interface GigabitEthernet0/0/0
alias GE0/MGMT
ipaddress 192.168.0.1 255.255.255.0
dhcpselect interface
dhcpserver gateway-list 192.168.0.1
#
return
[FW-GigabitEthernet0/0/0]undo ip add
13:08:42 2014/07/08
Info: The DHCP server configuration on thisinterface will be deleted.
[FW-GigabitEthernet0/0/0]display this
13:08:46 2014/07/08
#
interface GigabitEthernet0/0/0
alias GE0/MGMT
#
return
[FW-GigabitEthernet0/0/0]ip add 10.0.10.25424
13:09:29 2014/07/08
[FW-GigabitEthernet0/0/0]desc this portconnect to S1-G0/0/21
13:10:05 2014/07/08
[FW-GigabitEthernet0/0/0]interface G0/0/2
13:10:15 2014/07/08
[FW-GigabitEthernet0/0/2]ip add 10.0.30.25424
13:10:28 2014/07/08
[FW-GigabitEthernet0/0/2]desc this portconnect to S1-G0/0/23
13:10:53 2014/07/08
[FW-GigabitEthernet0/0/2]q
交换机上需要按照需求定义vlan
[Huawei]sysname S1
[S1]vlan batch 11 to 13
Info: This operation may take a fewseconds. Please wait for a moment...done.
[S1]interface g0/0/1
[S1-GigabitEthernet0/0/1]port link-typeaccess
[S1-GigabitEthernet0/0/1]port default vlan11
[S1]interface g0/0/2
[S1-GigabitEthernet0/0/2]port link-typeaccess
[S1-GigabitEthernet0/0/2]port default vlan12
[S1-GigabitEthernet0/0/2]interface g0/0/3
[S1-GigabitEthernet0/0/3]port link-typeaccess
[S1-GigabitEthernet0/0/3]port default vlan13
[S1-GigabitEthernet0/0/3]interface g0/0/21
[S1-GigabitEthernet0/0/21]port link-typeaccess
[S1-GigabitEthernet0/0/21]port default vlan11
[S1-GigabitEthernet0/0/21]interface g0/0/22
[S1-GigabitEthernet0/0/22]port link-typeaccess
[S1-GigabitEthernet0/0/22]port default vlan12
[S1-GigabitEthernet0/0/22]interface g0/0/23
[S1-GigabitEthernet0/0/23]port link-typeaccess
[S1-GigabitEthernet0/0/23]port default vlan13
步骤二.将接口配置到安全区域
防火墙默认有四个区域，分别是“local”、“trust"、“untrust”、“dmz”。
实验中我们用到“trust”、'untrust"、“dmz”三个区域。将G0/0/0加入untrust区域、g/0/0/2加入dmz和g/0/0/1加入trust。
[FW]firewall zone trust
13:45:31 2014/07/08
[FW-zone-trust]dis this
13:45:35 2014/07/08
#
firewall zone trust
setpriority 85
addinterface GigabitEthernet0/0/0
#
return
[FW-zone-trust]undo add inter
[FW-zone-trust]undo add interface g0/0/0
13:46:01 2014/07/08
[FW-zone-trust]add interface g0/0/1
13:46:22 2014/07/08
[FW-zone-trust]firewall zone untrust
[FW-zone-untrust]add interface g0/0/0
13:47:24 2014/07/08
[[FW-zone-untrust]firewall zone dmz
13:48:06 2014/07/08
[FW-zone-dmz]add interface g0/0/2
13:48:13 2014/07/08
[FW-zone-dmz]q
默认情况下，防火墙并不允许出local区域外的其它区域之间进行通信。为了便于验证配置的正确性，我们首先将防火墙区域之间的默认过滤规则配置为允许所有区域间通信。配置完成后在FW设备上测试连通性。
[FW]firewall packet-filter default permitall
13:51:19 2014/07/08
Warning:Setting the default packetfiltering to permit poses security risks. You
are advised to configure the securitypolicy based on the actual data flows. Are
you sure you want to continue?[Y/N]y
[FW]ping -c 1 10.0.10.1
13:51:56 2014/07/08
PING 10.0.10.1: 56 data bytes,press CTRL_C to break
Reply from 10.0.10.1: bytes=56 Sequence=1 ttl=255 time=90 ms
---10.0.10.1 ping statistics ---
1packet(s) transmitted
1packet(s) received
0.00% packet loss
round-trip min/avg/max = 90/90/90 ms
[FW]ping -c 1 10.0.20.2
13:52:08 2014/07/08
PING 10.0.20.2: 56 data bytes,press CTRL_C to break
Reply from 10.0.20.2: bytes=56 Sequence=1 ttl=255 time=400 ms
---10.0.20.2 ping statistics ---
1packet(s) transmitted
1packet(s) received
0.00% packet loss
round-trip min/avg/max = 400/400/400 ms
[FW]ping -c 1 10.0.30.3
13:52:18 2014/07/08
PING 10.0.30.3: 56 data bytes,press CTRL_C to break
Reply from 10.0.30.3: bytes=56 Sequence=1 ttl=255 time=410 ms
---10.0.30.3 ping statistics ---
1packet(s) transmitted
1packet(s) received
0.00% packet loss
round-trip min/avg/max = 410/410/410 ms
步骤三.配置静态路由，实现网络的连通性
在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接口之间的通信。R1无需定义缺省路由，原因是其作为internet设备，他不需要知道内部和DMZ区域的私有网络信息。
[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
13:58:26 2014/07/08
[FW]ip route-static 10.0.2.0 24 10.0.20.2
13:58:40 2014/07/08
[FW]ip route-static 10.0.3.0 24 10.0.30.3
13:58:52 2014/07/08
在防火墙上测试与10.0.1.0、10.0.2.0、10.0.3.0之间的连通性。
[FW]ping -c 1 10.0.1.1
14:00:18 2014/07/08
PING 10.0.1.1: 56 data bytes,press CTRL_C to break
Reply from 10.0.1.1: bytes=56 Sequence=1 ttl=255 time=80 ms
---10.0.1.1 ping statistics ---
1packet(s) transmitted
1packet(s) received
0.00% packet loss
round-trip min/avg/max = 80/80/80 ms
[FW]ping -c 1 10.0.2.2
14:00:25 2014/07/08
PING 10.0.2.2: 56 data bytes,press CTRL_C to break
Reply from 10.0.2.2: bytes=56 Sequence=1 ttl=255 time=170 ms
---10.0.2.2 ping statistics ---
1packet(s) transmitted
1packet(s) received
0.00% packet loss
round-trip min/avg/max = 170/170/170 ms
[FW]ping -c 1 10.0.3.3
14:00:29 2014/07/08
PING 10.0.3.3: 56 data bytes,press CTRL_C to break
Reply from 10.0.3.3: bytes=56 Sequence=1 ttl=255 time=110 ms
---10.0.3.3 ping statistics ---
1packet(s) transmitted
1packet(s) received
0.00% packet loss
round-trip min/avg/max = 110/110/110 ms
目前配置下，所有区域之间可以通讯，不被检查。但是由于当前尚未定义NAT，外部区域不能与内部和DMZ区域相互访问。
步骤四.配置区域间的安全过滤
配置从Trust区域的部分网段10.0.2.3发往Untrust区域的数据包被放行。从Untrust区域发往DMZ目标服务器10.0.3.3的telnet请求被放行。
[FW]firewall session link-state check
[FW]policy interzone trust untrust outbound
[FW-policy-interzone-trust-untrust-outbound]policy0
14:06:57 2014/07/08
[FW-policy-interzone-trust-untrust-outbound-0]policysource 10.0.2.0 0.0.0.255
14:07:18 2014/07/08
[FW-policy-interzone-trust-untrust-outbound-0]actionpermit
14:07:31 2014/07/08
[FW-policy-interzone-trust-untrust-outbound-0]q
14:07:40 2014/07/08
[FW-policy-interzone-trust-untrust-outbound]q
14:07:40 2014/07/08
]policy interzone dmz untrust inbound
14:09:01 2014/07/08
[FW-policy-interzone-dmz-untrust-inbound]policy0
14:09:08 2014/07/08
[FW-policy-interzone-dmz-untrust-inbound-0]policydestination 10.0.3.3 0
14:09:37 2014/07/08
[FW-policy-interzone-dmz-untrust-inbound-0]policyservice service-set telnet
[FW-policy-interzone-dmz-untrust-inbound-0]actionpermit
14:09:55 2014/07/08
[FW-policy-interzone-dmz-untrust-inbound-0]q
14:09:55 2014/07/08
步骤五.配置Easy-Ip，实现Trust区域到Untrust区域的访问。
配置使用Easy-IP，进行NAT源地址转换。并且将NAT与接口进行绑定。
[FW-nat-policy-interzone-trust-untrust-outbound]policy0
14:14:00 2014/07/08
[FW-nat-policy-interzone-trust-untrust-outbound-0]policysource 10.0.2.0 0.0.0.2
55
14:14:26 2014/07/08
[FW-nat-policy-interzone-trust-untrust-outbound-0]actionsource-nat
14:14:37 2014/07/08
[FW-nat-policy-interzone-trust-untrust-outbound-0]easy-ipg0/0/0
14:14:51 2014/07/08
[FW-nat-policy-interzone-trust-untrust-outbound-0]q
配置完成后，验证Trust区域与Untrust区域之间的访问是否正常。
<R2>ping 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 ---
5packet(s) transmitted
0packet(s) received
100.00% packet loss
<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=220 ms
Reply from 10.0.1.1: bytes=56 Sequence=2 ttl=254 time=100 ms
Reply from 10.0.1.1: bytes=56 Sequence=3 ttl=254 time=100 ms
Reply from 10.0.1.1: bytes=56 Sequence=4 ttl=254 time=120 ms
Reply from 10.0.1.1: bytes=56 Sequence=5 ttl=254 time=440 ms
---10.0.1.1 ping statistics ---
5packet(s) transmitted
5packet(s) received
0.00% packet loss
round-trip min/avg/max = 100/196/440 ms
注意，这里直接测试与10.0.1.1之间的连通性，显示不通。使用扩展ping，指定了发送数据包的源地址是10.0.2.2后，实现了连通性。原因是，直接发送数据包到10.0.1.1时，数据包的源地址到10.0.1.1时，数据包的源地址为10.0.20.2，该地址不属于NAT转换的客户端地址范围。
步骤六.将内网服务器10.0.3.3发布出去
配置内网服务器10.0.3.3的telnet服务，映射到地址10.0.10.20
[FW]nat server protocol tcp global10.0.10.20 telnet inside 10.0.3.3 telnet
在R3上开启Telnet功能，并在R1上测试，测试时需要注意，对外发布的地址为10.0.10.20，所以R1对10.0.3.3访问时，访问的目标地址为10.0.10.20。
[R3]user-interface vty 0 4
[R3-ui-vty0-4]authentication-mode password
Please configure the login password(maximum length 16):16
[R3-ui-vty0-4]set authentication password ?
cipher Set the password withcipher text
[R3-ui-vty0-4]set authentication passwordcip
[R3-ui-vty0-4]set authentication passwordcipher Huawei
[R3-ui-vty0-4]user privilege level 3
[R3-ui-vty0-4]q
<R1>telnet 10.0.10.20
Press CTRL_] to quit telnet mode
Trying 10.0.10.20 ...
Connected to 10.0.10.20 ...
Login authentication
Password:
<R3>
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