Automatic change of ISP by changing interfaces - how DNS ?

Hello,

Im working new with Microtik and have a very general question:

How to switch automatically to other interface (backup connection), when the first fails,

and how to switch the DNS to the DNS of second provider ?

Thanks a lot Andy

there are multiple ways to do this, for example:
http://www.mikrotik.com/testdocs/ros/2.9/ip/route_content.php#.4.2

or http://wiki.mikrotik.com/wiki/Improved_Netwatch_II

just search for Failover or Policy Routing

Hello,

sorry, I can´t detect anywhere on this links something about DNS.

Switch interfaces and network by ping I already know, bu not DNS.

Could you precise it somehow please ?

Thanks Andy

the script can do whatever you want. not just enable another Gateway, it can execute any command. Just make the script set a new DNS server …

or you could just use some of publicly available DNS servers like 4.2.2.2

http://theos.in/windows-xp/free-fast-public-dns-server-list/