dual-homing and dual-addressing ?

[Alexis Vassiliadis <aav @ mist . intec . ru>]

Hi,

Suppose I'm dual-homed, my web-server have 2 ip-addresses from 2 different 
spaces of 2 different providers. 

Will it be "backup" if one of my 2 links to providers will go down?
I.e., Does a browser poll another address from dns-reply if 1st is not
available?

Please share some expirience of such installations..

Alexis.