Sharp AHT-E300 - Manual (Page 22)

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AHT-E300 ADSL ROUTER
7. Click Configuration - [NAT] link. Then the NAT Configuration page will
appear. In this page, you can configure NAT function.
NAT
NAT Simply convert private IP address to public IP address
NAPT In addition to the NAT function, it can translate port information.
Disable Disabling NAT function.