ena

conf t

int fo/0

ip add +公网地址+子网掩码

ip nat ouside

no shut

int fo/1

ip add +内网地址+子网掩码

ip nat inside

no shut

ip route 0.0.0.0 0.0.0.0 +公网网关地址

access-list 1 premit+内网网关地址+0.0.0.255

ip nat in source list 1 int fo/0 overload

输完检測网络