Hi Masaru, NAT inside to outside: here the local ip address (any in the private ip add range, which is not legal on the internet, eg: 192.168.17.1) used in ur local network, is disguised by a public ip (eg: 202.24.23.22). this will allow the packet to flow accross the internet even though the origin has an illegal internetwork ip. NAT outside to inside: On the return path, the packet has to reach the origin for useful communication. But the packet would have an internet ip as the destination ip (in our eg: 202.24.23.22) which wouldnt naturally reach the actual destination. So the ip has to be converted back to the original, illegal ip. Regs., Prasad.
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