[CentOS] 2 internet connections and one for backup

> I've got 2 internet connections but unfortunately not the same - 6mbit 
> and 1 mbit. My default is 6mbit and I want to create backup connection 
> (1mbit). How can do it? Has anybody done it? My perfect scenario is that 
> my network uses 1mbit if (only) 6mbit fails and it switches 
> automatically.

There is a big difference if you are trying to failover for incoming 
traffic with a range of IP addresses or if you are just looking to have 
outgoing traffic just continue working in case of a failure of your 
primary link.

If you are trying to provide outgoing Internet connectivity only, 
<http://lartc.org/lartc.html> should provide you instructions for what you 
are trying to accomplish.

Barry