I do not think that is possible. What you need to do is network the two computers and have them using the same BB modem.
What type of modem are you currently using?
Can you run a network cable to the upstairs computer?
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How to get WWDC 2017 tickets
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.