How to determine if my NIC's are up?

I am remotely monitoring a snort box with 5 interfaces. One interface
has an IP address, and 4 don't. I need a way to periodically determine
if all interfaces are working. I know I can just ping the one with the
IP address, but how do I confirm if the other 4 are working?

On 2 Nov 2005 15:45:59 -0800, (E-Mail Removed) wrote:
> I am remotely monitoring a snort box with 5 interfaces. One interface
> has an IP address, and 4 don't. I need a way to periodically determine
> if all interfaces are working. I know I can just ping the one with the
> IP address, but how do I confirm if the other 4 are working?

Cron script does a ping broadcast for each nic's group and emails you
failures and/or does an xmessage -disp your_ip:0 "nic X failure" &

If boxes refuse/drops broadcasts, ping each node for one pass then
goto next nic.


Scripting command refresher docs found here, if needed.

! bash script introduction documentation
http://tldp.org/LDP/intro-linux/html/index.html
! bash script advanced documentation
http://tldp.org/LDP/abs/html/index.html

(E-Mail Removed) wrote:

> I am remotely monitoring a snort box with 5 interfaces. One interface
> has an IP address, and 4 don't. I need a way to periodically determine
> if all interfaces are working. I know I can just ping the one with the
> IP address, but how do I confirm if the other 4 are working?

If you can ping the box, use ssh to run ifconfig and see what comes back.

>ping broadcast for each nic's group

This is the only part I don't understand. How do I determine a NIC's
group?

Thanks much

On 2 Nov 2005 18:00:56 -0800, (E-Mail Removed) wrote:
>>ping broadcast for each nic's group
>
> This is the only part I don't understand. How do I determine a NIC's
> group?

Well, I am confused. Since you indicated you were on a multi nic
machine I would have assumed you knew.

Doing a ifconfig will give you the current nics which are up and
running.

(E-Mail Removed) <(E-Mail Removed)> wrote:
> I am remotely monitoring a snort box with 5 interfaces. One interface
> has an IP address, and 4 don't. I need a way to periodically determine
> if all interfaces are working. I know I can just ping the one with the
> IP address, but how do I confirm if the other 4 are working?

mii-tool

Chris