Date: Fri, 28 Jan 2000 22:25:23 -0500 From: Scott Gregory <bsdbox@citizen.infi.net> To: keramida@ceid.upatras.gr Cc: freebsd-questions@FreeBSD.ORG Subject: Re: Detecting loss of Network Connection Message-ID: <38925DA3.A15BC6F9@citizen.infi.net> References: <389103E4.78D1E910@citizen.infi.net> <20000129035709.A18572@hades.hell.gr>
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Thanks for your reply. I am not trying to fix a current problem....I am
trying to stop a fuure problem. Let me explain....
I am creating a firewall box (2 boxes actually) that will be connected
to 2 different switches on both the Inet side and the internal side (4
NIC's). The two switches on the Inet side each have a connection to the
Inet, one main connection and one backup. The switches will be
connected. This should eliminate any single point of failures from the
inet or a dead switch. The internal side has the same
configuration....2 switches with the firewall(s) connected to both.
I need to be able to actively monitor the "primary" NIC. If the link
goes down for any reason (NIC dies, cable fries, switch dies, etc) I
need to reconfigure the "backup" NIC to answer for the required IP. For
this reason, I need something that will monitor the links and is fairly
easy on the resources.
Thanks,
Scott
Giorgos Keramidas wrote:
>
> On Thu, Jan 27, 2000 at 09:50:12PM -0500, Scott Gregory wrote:
> > To All,
> >
> > Are there any tools or utilities that I can use to detect when a network
> > connection has been lost?
>
> Do you mean like when an interface (tun? or ppp?) goes down? Since I'm
> not using user ppp anymore, I wrote a simple shell script that I call
> from my /etc/crontab to do this kind of stuff. The heart of it contains:
>
> ifconfig -au | grep ppp0 >/dev/null || {
> # the interface just went that way
> pppd call ISP
> }
>
> > Has anyone already created a tool that will do this? This solution
> > would have to be light on system resources since it would need to run
> > every couple seconds (at a maximum).
>
> Nah, running it so many times will probably make it a cpu hog. Try to
> fix the problem even deeper, where it's root may be hidden.
>
> --
> Giorgos Keramidas, < keramida @ ceid . upatras . gr >
> "Don't let your schooling interfere with your education." [Mark Twain]
>
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