we have two diff ISP's bringing in broadband to our office. we have comcast on one side and AT&T on the other. what we hope to do is be up even if one of those providers is down. we also would like to use all of the bandwidth provided by both of these providers.
my question is what to plug that into. I know sonicwall offers devices (as well as other vendors) that allow dual WAN ports for failover, but that's not exactly what I'm looking for. I'd like to set up two diff MX records so that if mail fails to reach us on one IP, it will come in on the other IP. I'd like my outbound traffic to use ISP one unless it's busy and then bounce over to ISP two. kind of like bonded T1's do, ya know.
what are your thoughts?
PS: please feel free to ask me questions too in order to better understand what I want.