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difference between nvi nat and nat

I have nat setup as below.

ip nat inside source static tcp 10.0.0.25 443 interface FastEthernet0 443

Fastethernet0 (ip nat outside)

It works fine from internet trying to https://somedomain.com. But it doesnot work for internal users trying to https://somedomain.com. Nat wont happen.

I thought NVI nat will help. So I changed Fastethernet0 to ip nat enabled. Also changed nat to

ip nat source static tcp 10.0.0.25 443 interface FastEthernet0 443

Nat still happen when traffic is coming from internet, but no reply back.

NAT still wont happen when traffic is from internal network.

DO I misunderstand the use of nvi? I dont need to change the vlan1 from nat inside to nat enable, do I? Because nat is happening on Fastethernet 0.

Any idea?

Thanks

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