we have a T1 installed at our site and recently purchased a broadband connection from a different ISP. Our plan is to utilize both ISPs to Load-balance our Internet and setup auto-failover in case either one fails. We run exchange 2007 and host an ASP application so we can't afford to have our Internet disrupted.
currently we have a 1841 cisco router for the T1 and we're trying to figure-out if we need to purchase an ASA Firewall to setup the auto fail-over / load balance system.
Can you tell me which is the best way to do this and what equipment / model of cisco routers/ Firewalls do you recommend to implement this?