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Date:      Tue, 19 Nov 2019 23:12:48 +0000
From:      "Dave Cottlehuber" <dch@skunkwerks.at>
To:        freebsd-net <freebsd-net@freebsd.org>
Subject:   if_tap limits in 12.1R amd64?
Message-ID:  <c87b8d82-97cd-4369-8d57-b1c93bc39a45@www.fastmail.com>

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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 



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