On Sun, 12 Oct 2003, Brian Grayson (home) wrote:

:   I hacked, and now have a program (tentatively called ifwatcher)
: that checks the status of the named interface, and when it changes,
: runs /etc/ifwatch <interface> <active|inactive>.

There's already something in NetBSD that is similar to this:  ifwatchd(8).
It bases up/down on addresses being added/deleted, but certainly it could
monitor other types of interface state.

-- 
-- Todd Vierling <tv@duh.org> <tv@pobox.com>