Public static ip

Hello,
i’m interested in your router but i’ve some question:

We have a set of static public ip supplied by isp X.
These ip are assigned to front-end servers.
These servers are load balanced by microsoft nlb.
What happens if we buy your router and we connect a second isp?

How can we make servers available from users when isp X is down?
Should we buy a second nic for each server and assign to them the static public ip provided by isp Y?

Is Microsoft nlb compatible with 2 public nic on each server?

This is inbound load balancing and the trick is let Peplink be your DNS server so it will be resolving your server hostname e.g. server1.yourdomain.com to public IP from ISP X and ISP Y. Traffic can be load balanced on both ISP WAN and they will back each other up so your server will be accessible at all times.

This page should give you more details.