[Bug 251047] Multicast: Not possible to add MFC entry's when MAXVIFS = 64

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251047

--- Comment #3 from Andrey V. Elsukov <ae at FreeBSD.org> ---
(In reply to Louis from comment #2)

It seems there is no easy way, but the kernel has sysctl variable that depends
from MAXVIFS:

# sysctl -o net.inet.ip.viftable
net.inet.ip.viftable: Format:S,vif[MAXVIFS] Length:1792
Dump:0x00d068f601f8ffff0000000000000000...

The size of struct vif is known, so you can determine MAXVIFS.

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