When you mean Bo1 you can easily join via friendslist or connect ipv4 ip from host.

ExtraTclassic
@ExtraTclassic
Posts
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Cannot connect to peers on same local network -
Can I invite friends to play Co-Op Zombies if I add them as a friend on Plutonium?Friend list in plutonium works a bit different just sned them a link of your profile they have to "heart" you then you see a notification and "heart" back.
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Can I invite friends to play Co-Op Zombies if I add them as a friend on Plutonium?Yes but you have to be friends in order to invite somebody.
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Cant get smooth 100hz refresh rateYou have to unlock the FPS via the conole command is: com_maxfps 1000