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使用cisco路由器来配置NAT之后，遇到了ping操作的问题，详情如下：
int g0/0
ip address 124.207.70.106 255.255.255.248
ip nat outside
ip nat pool OUT 124.207.70.102 124.207.70.105 netmask 255.255.255.248
ip nat inside source list 100 pool OUT overload
ip nat inside source static tcp 192.168.100.1 80 124.207.70.102 80 extendable
ip nat inside source static tcp 192.168.100.2 80 124.207.70.103 80 extendable
ip nat inside source static tcp 192.168.100.5 80 124.207.70.104 80 extendable
ip nat inside source static tcp 192.168.100.7 80 124.207.70.105 80 extendable
ip route 0.0.0.0 0.0.0.0 124.207.70.101
从外网ping 124.207.70.106不通，ping 124.207.70.102 和124.207.70.103时而通时而不通，tracert以上2条IP在网关124.207.70.101这一跳返回TIMEOUT，求解？？ | 
