Detecting LINK_UP / LINK_DOWN events

[Tom Judge]

Sastry Tumuluri wrote:
> Friends,
> 
> I am trying to catch and do some extra processing on LINK_UP and LINK_DOWN
> events for my net interfaces (e.g., notify my admin, log the event, ...).
> Tried this on both FreeBSD 6.1 and on FreeBSD 6.2.
> 
> I tried using the devd.conf file with the following code (shows LINK_DOWN;
> wrote similar stuff for LINK_UP):
> 
> notify 10 {
>    match   "type"    "LINK_DOWN";
>    action   "logger -s alert: Caught LINK_DOWN on dev: $device-name
> subsys:  $subsystem";
> };
> 
> Didn't work. I tried the above with both strict match conditions (using
> vendor, device and class matches) as well as very general (like the above).
> Didn't work.
> I ran killed devd and ran it in the foreground with "devd -dD". Then I
> logged into a different pty and used
> ifconfig lnc0 down     #(lnc0 is my ethernet device).
> devd doesn't even seem to catch the event (no output at all - both on 
> screen
> and in syslog).
> 
> 
> On the other hand, "nomatch" and "attach" messages do seem to get 
> through (I
> wrote similar stuff for nomatch & attach, and they are showing up at bootup
> and in syslog).
> What could I be doing wrong?
> 

Have you had a look at net/ifstated in ports?

Tom