ip nat

[saintlan1]

what will be the effect of ip nat if you implemented in one interface< ip nat inside for f0/0, ip nat outside in f0/0.100>

[dongdongliu]

because there is a subinterface in the f0/0, f0/0 must have no ip address, Inside_source_ipaddresses do not relate with f0/0. so nat will not work well.