Re: [LARTC] Will advanced linux routing help me

["Sushil Suresh" <sushil@svw.com>]

Hi,

    At the moment we are using trace and ping to check the availability of a
particular site, and the status of a particular ISP

The problem faced in making use of these commands in a script is that, they
may fail in case of congestion and may be misunderstood as failure of a
particular ISP.

Also how and why do you flush the route cache?

with regards,
Sushil Suresh

----- Original Message -----
From: Arthur van Leeuwen <arthurvl@sci.kun.nl>
To: Sushil Suresh <sushil@svw.com>
Cc: <lartc@mailman.ds9a.nl>
Sent: Wednesday, April 25, 2001 1:09 PM
Subject: Re: [LARTC] Will advanced linux routing help me


> On Wed, 25 Apr 2001, Sushil Suresh wrote:
>
> [snip, automatic rerouting when interfaces are downed]
>
> > Is there any means to automise the whole process. The effective aim
> > is to utilize the most of all the isps that are available at a moment
> > of time.
>
> > ( At the moment we attain this via static routing and we have one
> > personal monitoring this round the clock, in case a rerouting is
necessary )
>
> Okay, the thing to do is to figure out what this person is doing to check
if
> the links are up. Once you know this, you put that knowledge into a script
> that checks if the link is up and run that script from cron. Depending on
> the status of the uplinks you then let the script select one of the
possible
> static routings and enable it. (Rebuilding routing tables barely hurts
> reliability, *especially* if you do not flush the route cache).
>
> Hope this helps.
>
> Doei, Arthur. (The tricky part is the link-state monitoring... at the
TCP/IP
>                level this is theoretically impossible...)
>
> --
>   /\    / |      arthurvl@sci.kun.nl      | Work like you don't need the
money
>  /__\  /  | A friend is someone with whom | Love like you have never been
hurt
> /    \/__ | you can dare to be yourself   | Dance like there's nobody
watching
>


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