Juniper SRX550防火墻NAT配置

一、Source NAT

對于不需要做NAT的網段（比如IPSec×××），需要先關閉這些地址的NAT（如果沒有則跳過）

set security nat source rule-set trust-untrust rule no-nat match source-address 192.168.0.0/16

set security nat source rule-set trust-untrust rule no-nat match destination-address 10.10.0.0/24

set security nat source rule-set trust-untrust rule no-nat then source-nat off

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對于需要上網或者所有的網段（做地址轉換的網段），做source-nat

首先定義一個地址池（要轉換的公網地址）：

set security nat source pool natpool1?address 112.48.20.11/32 to 112.48.20.15/32

set security nat source pool natpool2 address 112.48.20.21/32 to 112.48.20.30/32

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配置NAT規則匹配源、目、轉換地址池

set security nat source rule-set trust-untrust from zone trust

set security nat source rule-set trust-untrust to zone untrust

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//匹配特定的地址進行轉換（沒有特定可省略）

set security nat source rule-set trust-untrust rule nat1?match source-address 0.0.0.0/0

set security nat source rule-set trust-untrust rule nat1?match destination-address 183.253.58.253/32

set security nat source rule-set trust-untrust rule nat1?then source-nat pool natpool1

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//默認所有的源、目地址進行轉換

set security nat source rule-set trust-untrust rule nat2?match source-address 0.0.0.0/0

set security nat source rule-set trust-untrust rule nat2?match destination-address 0.0.0.0/0

set security nat source rule-set trust-untrust rule nat2?then source-nat pool natpool2

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如果NAT地址池有多個地址，除了接口地址，那么其它地址需要做proxy-arp

set security nat proxy-arp interface ge-0/0/0.0 address 112.48.20.11/32 to 112.48.20.15/32

set security nat proxy-arp interface ge-0/0/0.0 address 112.48.20.21/32 to 112.48.20.30/32

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做完這些就可以了？ NO！ NO！ NO！防火墻域間策略不能忘

//首先定義兩個地址池，并加入到地址組NET中

set security zones security-zone trust address-book address 192.168.100.0?192.168.100.0/24

set security zones security-zone trust address-book address 192.168.200.0?192.168.200.0/24

set security zones security-zone trust address-book address-set NET?address 192.168.100.0

set security zones security-zone trust address-book address-set NET?address 192.168.200.0

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//將地址組匹配到trust到untrust的策略中，并放行

set security policies from-zone trust to-zone untrust policy 1?match source-address NET

set security policies from-zone trust to-zone untrust policy 1?match destination-address any

set security policies from-zone trust to-zone untrust policy 1?match application any

set security policies from-zone trust to-zone untrust policy 1?then permit

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到此，這192.168.100.0和192.168.200.0就可以通過NAT上網了

二、Destination NAT

部分服務器需要映射到公網去，怎么做呢？那么往下看：

//首先創建要映射的服務器地址池（包括IP地址和端口）

set security nat destination pool 1?address 192.168.168.168/32

set security nat destination pool 1?address port 443

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//創建Destination NAT規則要映射的服務器地址池（包括IP地址和端口）

set security nat destination rule-set desnat from zone untrust

set security nat destination rule-set desnat to?zone trust

set security nat destination rule-set desnat rule server1?match source-address 0.0.0.0/0

//匹配訪問112.48.20.2的4430端口轉換到內網服務器的443端口

set security nat destination rule-set desnat rule server1 match destination-address 112.48.20.2/32

set security nat destination rule-set desnat rule server1 match destination-port 4430

set security nat destination rule-set desnat rule server1 then destination-nat pool 1

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還有必不可少的防火墻域間策略

//創建內網服務器地址組及端口

set security zones security-zone trust address-book address server1?192.168.168.168/32

set applications application Service_4430?term Service_4430 protocol tcp

set applications application Service_4430 term Service_4430 source-port 0-65535

set applications application Service_4430 term Service_4430 destination-port 4430-4430

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//創建untrust到trust的策略，目前地址匹配內網服務器地址及端口

set security policies from-zone untrust to-zone trust policy 1?match source-address any

set security policies from-zone untrust to-zone trust policy 1?match destination-address server1

set security policies from-zone untrust to-zone trust policy 1?match application Service_4430

set security policies from-zone untrust to-zone trust policy 1?then permit

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至此，外網就可以使用http://112.48.20.2:4430/訪問內網的服務器了

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還有一個問題，此時內網的用戶卻不能使用這個公網地址訪問內部的服務器，這個需要在NAT上再做一個內部的地址轉換，如下：

//創建一個源地址映射的地址池（內部服務器映射的地址）

set security nat source pool sorpool4 address 112.48.20.2/32

//創建trust到trust的策略如下

set security nat source rule-set trust-trust from zone trust

set security nat source rule-set trust-trust to zone trust

set security nat source rule-set trust-trust rule server1?match source-address 0.0.0.0/0

set security nat source rule-set trust-trust rule server1?match destination-address 192.168.168.168/32

set security nat source rule-set trust-trust rule?server1 match destination-port 443

set security nat source rule-set trust-trust rule server1 then source-nat pool sorpool4

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至此，內網也可以通過公網地址訪問內部服務器了！！！

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????如有雷同，純屬巧合，歡迎指正！