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Got the game cant play with friends across the country, how do you play online? (NOT LAN).
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Battle.net (Global by GOG) is preferred, but this requires the proper port forwarding procedure to be followed. The best port forwarding guide I am aware of for Diablo 1:

https://d1legit.com/2019/03/31/diablo-1-hosting-on-battle-net-port-forwarding-guide/

Alternately, many of us have had success using gameranger, it is free and easier to configure. Another guide by D1Legit.com:

https://d1legit.com/2019/03/31/diablo-1-playing-multiplayer-on-gameranger-setup-guide/