CISCO POOL NAT 思科动态地址池转换

r7isp

hostname r7isp
!
interface Serial5/0
ip address 20.0.0.100 255.255.255.0
no shutdown
!
end

r1
hostname r1
!
interface FastEthernet0/0
ip address 10.0.0.254 255.255.255.0
no shutdown
!
interface FastEthernet1/0
ip address 10.1.1.254 255.255.255.0
no shutdown
!
interface Serial5/0
ip address 20.0.0.1 255.255.255.0
no shutdown
!
end

r2pc

hostname r2pc
!
interface FastEthernet0/0
ip address 10.0.0.1 255.255.255.0
no shutdown
!
no ip routing
!
ip default-gateway 10.0.0.254
!
end

r3server
hostname r3server
!
interface FastEthernet1/0
ip address 10.1.1.1 255.255.255.0
no shutdown
!
no ip routing
!
ip default-gateway 10.1.1.254
!
end

r1 配置如下：

interface FastEthernet0/0
ip address 10.0.0.254 255.255.255.0
ip nat inside
!
interface FastEthernet1/0
ip address 10.1.1.254 255.255.255.0
ip nat inside
!
interface Serial5/0
ip address 20.0.0.1 255.255.255.0
ip nat outside
!
ip nat pool mypool 20.0.0.11 20.0.0.19 netmask 255.255.255.0
ip nat inside source list POOLNAT pool mypool
!
ip access-list extended POOLNAT
permit ip 10.0.0.0 0.0.0.255 any
permit ip 10.1.1.0 0.0.0.255 any
!
end

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注意：ip nat inside source list POOLNAT pool mypool   overload 

如果内网有更多的PC、SERVER需要访问公网，当动态地址池中的地址使用完后，部分用户将不能正常的进行地址转换，仍需使用端口复用技术，加上overload 参数 即PAT。