[LARTC] Will advanced linux routing help me

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

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Hi,

    I have a private network which is connected to 3 diffrent ISPs. I also have a linux box acting as a gateway and internet firewall for the internal network. The network is as shown below


          Linux Gateway/Firewall
                      |                
                      |
                      |
              Ethernet Hub ----------------------------------------------------------------------Ethernet Hub--------|--
             /        |           \                                                                                                |--   Local Network
          /           |             \                                                                                              |--
       /              |                \
ISP-I            ISP-II            ISP-III

 
My problem is i have a couple of sites which are to be divided into 3 groups and each to be routed through a particular isp ( this is generally choosen by the requirements of the site. Some of the sites need very fast
response time, some need large volumes of data to be transfered, and some need a very stable connection ).

Appart from these few sites the rest of the traffic is routed through one of the isp ( the one with the highest bandwidth ) 

And when a particular ISP fails the routes currently being used by this ISP is to be shifted to the other 2 ISPs.

I also require the routes to be restord back to as decided earlier once the isp which was down comes back
 
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 )


with regards,
Sushil Suresh

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