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NAT


Static NAT
==============================================
Router(config-if)#ip address 10.1.1.1 255.255.255.0
Router(config-if)#interface fa 0/0
Router(config-if)#ip address 192.168.1.1 255.255.255.0
Router(config-if)#exit
Router(config)#ip nat inside source static 192.168.1.2 10.1.1.1
Router(config)#interface fa 0/0
Router(config-if)#ip nat inside
Router(config-if)#interface fa 0/1
Router(config-if)#ip nat outside



Router#show ip nat translations
Pro  Inside global     Inside local       Outside local      Outside global
---  10.1.1.1          192.168.1.2        ---                ---
tcp 10.1.1.1:1026      192.168.1.2:1026   10.1.1.2:80        10.1.1.2:80



Dynamic Address Translation
=============================================

Router(config)#interface fa 0/0
Router(config-if)#no shutdown

Router(config-if)#
%LINK-5-CHANGED: Interface FastEthernet0/0, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up
ip add
Router(config-if)#ip address 192.168.1.1 255.255.255.0
Router(config-if)#ip nat inside
Router(config-if)#exit
Router(config)#interface fa 0/1
Router(config-if)#ip address 10.1.1.1 255.255.255.0
Router(config-if)#ip nat outside
Router(config-if)#exit

Router(config)#access-list 1 permit 192.168.1.0 0.0.0.255
Router(config)#ip nat pool test 10.1.1.2 10.1.1.7 netmask 255.255.255.248
Router(config)#ip nat inside source list 1 pool test






Overloading an inside global address
=============================================

Router(Config)#interface fa 0/1
Router(config-if)#ip address 10.1.1.1 255.255.255.0
Router(config-if)#ip nat outside

Router(config)#interface fa 0/0
Router(config-if)#ip address 192.168.1.1 255.255.255.0
Router(config-if)#ip nat inside


Router(config)#access-list 1 permit 192.168.1.0 0.0.0.255
Router(config)#ip nat inside source list 1 interface fa 0/1 overload

**上面也可以先宣告Pool,也就是類似Dynamic Address Translation**
Router(Config)#ip nat pool test 10.1.1.1 10.1.1.1 netmask 255.255.255.0
Router(Config)#ip nat inside source list 1 pool test overload


Router#show ip nat translations
Pro  Inside global     Inside local       Outside local      Outside global
icmp 10.1.1.1:21       192.168.1.2:21     10.1.1.2:21        10.1.1.2:21
icmp 10.1.1.1:22       192.168.1.2:22     10.1.1.2:22        10.1.1.2:22
icmp 10.1.1.1:23       192.168.1.2:23     10.1.1.2:23        10.1.1.2:23
icmp 10.1.1.1:24       192.168.1.2:24     10.1.1.2:24        10.1.1.2:24
icmp 10.1.1.1:25       192.168.1.2:25     10.1.1.2:25        10.1.1.2:25
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