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网络技术中的NAT地址转换技术，一分钟了解下( 三 )

NAT地址


cisco1#ping 192.168.23.3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.23.3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 68/71/80 ms
Terminal-Server>2
[Resuming connection 2 to cisco2 ... ]
01:01:55: NAT*: s=192.168.12.1->192.168.34.1, d=192.168.23.3 [74]
01:01:55: NAT*: s=192.168.23.3, d=192.168.34.1->192.168.12.1 [74]
省略…
cisco2#sh ip nat tr
Pro Inside global Inside local Outside local Outside global
Icmp 192.168.34.1:6 192.168.12.1:6 192.168.23.3:6 192.168.23.3:6
注：由于发送的ping包，所以显示转换的是icmp协议 。随机产生端口号6 。
cisco2#
01:02:55: NAT: expiring 192.168.34.1 (192.168.12.1) icmp 6 (6)
注：约1分钟的时间释放地址转换的空间 。
cisco2# sh ip nat translations----查找NAT，表中没有任何的转换条目 。
cisco2#
8、在cisco1用192.168.12.2上ping 192.168.23.3
cisco1#ping
Protocol [ip]:
Target IP address: 192.168.23.3
Extended commands [n]: y
Source address or interface: 192.168.12.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.23.3, timeout is 2 seconds:
Packet sent with a source address of 192.168.12.2
!!!!!
Terminal-Server>2
[Resuming connection 2 to r5 ... ]
01:03:37: NAT: s=192.168.12.2->192.168.34.1, d=192.168.23.3 [75]
01:03:37: NAT*: s=192.168.23.3, d=192.168.34.1->192.168.12.2 [75]
省略…
cisco2#sh ip nat tr
Pro Inside global Inside local Outside local Outside global
icmp 192.168.34.1:7 192.168.12.2:7 192.168.23.3:7 192.168.23.3:7
注：端口号已改为7 。
cisco2#
01:04:37: NAT: expiring 192.168.34.1 (192.168.12.2) icmp 7 (7)




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