利用CISCO路由器建立企业网络的安全机制
interface serial 0 ip access-group 100 inip access-group 101 out
access-list 100 permit icmp any 192.168.18.0 0.0.0.255 echo-reply
access-list 100 permit icmp any 192.168.18.0 0.0.0.255 packet-too-big
access-list 100 permit icmp any 192.168.18.0 0.0.0.255 ttl-exceeded
access-list 101 permit icmp 192.168.18.0 0.0.0.255 any echo-reply
access-list 101 permit icmp 192.168.18.0 0.0.0.255 any packet-too-big
access-list 101 permit ip 192.168.18.0 0.0.0.255 any
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