One of my customers have SINGLE WEB SERVER, he has successfully NATTED using one public ip using primary ISP public IP and he is able to access it but, now he has done NATTING to that same web server using another public ip (secondary ISP).
Is it possible to do so? I don't know much about that.
apart from this, customer is having issue when he is trying to access that web server through Secondary ISP public ip, but, using a primary public IP it's accessible but, not with Secondary ISP public IP.
he has done this on FIREWALL.
Do you have multiple default routes on the server? Only one would work unless you have specific routes added for certain destinations.
Traffic incoming to the server shouldn't have any issues. Traffic leaving the server would only follow one/preferred default route.