IOGear GPSU21 - Manual (Page 30)

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Select the option for a network printer, then 3.
click Next.
Select the option to connect to a printer on 4.
the internet, and type in the full IPP address
as shown. You must use the external, or
WAN, IP address of your router if the print
server is behind one. You must also specify
port 631 and queue name “lp1” in
lowercase. Click
Next to continue.