... no?
I left 'local IP' blank, and just tried my Hamachi IP, my external IPv4 and 'localhost'.
Also, it's a bit off topic, but meh: I was going to ask on Steam, but I suppose here's as good a place as any. I was wondering about the Redboid server; I saw your name come up on /r/Redboid, indeed you seem quite established around there (that makes you something of an expert on the topic, imo). What I meant to ask specifically was, I suppose, would you recommend the server? I guess yours can't help but be a slightly biased opinion, but then again I am looking for reasons to give the server a try, not reasons not to. Lol.
I stumbled upon it a couple weeks ago and thought it looked interesting, especially as it seems to have some well-established guilds on the server as well as its own modpack (something one generally doesn't bother setting up unless the server is faring comparatively well).