we are using Red hat enterprise 5.4 for our internet connection with following ip's

eth0: 192.168.1.2 (local lan)
eth1: 114.143.28.240 (static ip address for 1st isp)
eth2: 192.168.100.149 (2nd isp modem connected with lan cable)

first isp i.e tata internet connected to the internet and working very well

now i want 2nd isp to work when the first isp goes down, i had configured all dns in the resolve.conf and squid.conf, when i switch off the 1st isp for checking that failover is working or not i cannot get internet packets from the second isp.

please guide me for where to add route and iptables commands, please give me in the detail for route commands and iptables commands

Regards

Satish

Check if this can help you.

http://lartc.org/howto/lartc.rpdb.multiple-links.html

The link you suggested is showing 4 lan cards in the system and also does not cover failover it is just showing load balancing

I need 2 isp with 3 lan cards because in the system i does not have pci slot and not thinking of buying usb lan cards

Regards

Satish

If you can use an OS ClearOS which is based on RedHat .. One of the best choice .. Everything you want are inside that..

You can use as many wans with that with load-balancing and autofailover by default..

your suggestion suggesting that it is not possible in redhat enterprise and install clearos linux system which is based on the redhat.

can it is possible in redhat enterprise?

Regards

Satish

Oh no, you got me wrong. I am suggesting, what you want, is by default in that, a ready-made solution. If not possible in RedHat how its possible in ClearOS ?