CISCO- TWO ISP fail-over (No BGP)? <<HELP>>

It would be hard to use public IP LAN addresses.
You need to use NAT and assign two default routes. Assign higher metrica to the secondary and lower to primary.
DynDNS record for your servers, it will change IP for your servers as needed.
Round-robin DNS record which will return  IPs in different order for each request for load balansing.

Need more details, let me know.

You can't have real inbound fail over without AS and BGP.  With dynamic DNS it may work, but not always.

The problem is that you can't route ISP1 IP addresses over ISP2's network, or the other way around without AS and BGP.

This means that for "mailserver.yourdomain.tdl" you need to have an IP address from both ISP1 and ISP2.  With round robin DNS you will load balance the inbound connections, but if ISP1 goes down, then every other request will fail.

With dynamic DNS you could remove the entry for ISP1, but you have the issue of cached resolution requests.  Even if you code a ttl of 0, there are caching DNS servers on the internet that will cache entries for up to 72 hours no matter what ttl you code.

So for inbound traffic, there is not a whole lot you can do.

giltjr, I'm agree.

Besides that I'd purchase some sort of hosting for mail and other services from a reliable data center if it's mission critical for the business. Virtual dedicated servers are not that expensive this days.

lrmoore, could you explain what's the poing to use SLA?