On Sun, Oct 12, 2003 at 01:23:41AM -0400, Todd Vierling wrote:
> 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.

  That's exactly what we were looking for!

  It looks like link up/down are (both) type RTM_IFINFO.  Where would I
find documentation about what to do with the rtm_* fields on a
link up/down message?  It appears that on link down, the rtm_seq is 1,
and on link up, the rtm_seq is 2, but I don't see anything obvious
in the header files, and 'grep -r rtm.seq /usr/src/sys' turned up
surprisingly little.

  Thanks.

  Brian