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nat 转换
# 交换机内网端口
int g0/0/1
ip address 192.168.10.254 255.255.255.0
# 交换机外网端口
int g0/0/20/0/2
ip address 137.25.10.1 255.255.255.0
# 端口允许通过
acl 1000
rule permit source 192.168.10.0. 0.0.0.255
# 与互联网互联的端口添加nat映射
# nat 转换IP不要与已有IP冲突
nat address-group 1 137.25.10.2 137.25.10.4
int g0/0/1
nat ountbound 1000 address-group 1