This entry builds on my entry for how to use Apple Remote Access Personal Server (ARA PS 2.1) to connect Basilisk II to a 68k Macintosh with AppleTalk over a null modem connection. Once that connection has been created between your Macintosh system and modern system running Basilisk II, you can use IPNetRouter to bridge the ARA PS’s AppleTalk connection with Basilisk II’s ethernet connection and surf the web from your Macintosh.
About a year ago I purchased a null modem (serial) cable to let me connect my Apple IIe Card enabled LC 475 to my Apple IIc, and decided I should also test it out as a way to transfer files between my Windows 10 PC (should also work with OSX and Linux) and my Macintosh Plus, it was actually fairly easy. Initially I used it with Zterm, but after a bit of experimentation I got it working with Apple Remote Access Personal Server 2.1 (ARA PS) and can now use Basilisk II to access files using AppleShare and see all the shared devices on my LocalTalk (AppleTalk) network. The speed is still fairly slow, so for larger files I use Basilisk II to edit my drive/volume images, or connect using my Asante SCSI to ethernet adaptor.