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I have experience configuring Zywall 645 DSL router ports to access devices inside an internal network, where I go to Menu 15 and add ports, eg 1723:X.X.X.X for VPN, 3200:X.X.X.X for HTTP etc. Internet users then use X.X.X.X:3200 to access the device. I have gone through the menu settings on a Cayman 3346 and I have no clue where to configure similar settings. 
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I have experience configuring Zywall 645 DSL router ports to access devices inside an internal network, where I go to Menu 15 and add ports, eg 1723:X.X.X.X for VPN, 3200:X.X.X.X for HTTP etc. Internet users then use X.X.X.X:3200 to access the device. I have gone through the menu settings on a Cayman 3346 and I have no clue where to configure similar settings. 

Help to configure Netopia Cayman 3346 router ports

The term broadband commonly refers to high-speed Internet access that is always on and faster than the traditional dial-up access. Broadband includes several high-speed transmission technologies such as digital subscriber line (DSL), cable, fiber optics, wireless (for which there is a separate topic), satellite and broadband over powerlines (BPL).