if_tap limits in 12.1R amd64?

[Dave Cottlehuber]

I use a port, net/zerotier, that uses if_tap(4) to provide a mesh VPN. If I add many IPv6 aliases to its /80 routable IPv6 interface, sometime around adding ~ 1100 or more aliases, the port dies. If I'm really lucky, system panics. Now that I'm watching it, no such luck....

Am I running into some limitations or thresholds for if_tap? lo has no trouble soaking up this number of aliases.

thanks
Dave