You can balance the packet load by making both links the same cost to the internet. Then turn off ip route cache on both links. Depending on the class of router your using, the CPU load may increase significantly.
Load balancing needs to be looked at in both directions, to internet (outbound), and from internet (inbound). Outbound traffic is the easiest direction to load balance because you have total control. Your router is making the decision which link to use. However, inbound traffic is more difficult to load balance they way you want because you have no direct control over the routers making those decisions. For example, in your case, consider for a moment how the Internet is going to return traffic to your firewall. With outbound traffic, your firewall is going to perform NAT (changing the source address of the traffic to that of a public ISP address assigned to you).
This means that all of your outbound traffic, no matter which ISP link you send it out on, will appear to the internet routers to have only come from the ISP whose address space you are using for NAT on your firewall. Thus, all of the return traffic (inbound) will come in through a single link. And, in most cases, inbound is the majority of traffic. When I click on a hyperlink in my web browser I am sending a small http connection request (outbound traffic), then my browser downloads all the pictures and text of the page I want to view (inbound trafic).
Your solution may involve a method of using both of your ISP assigned addresses to NAT your outbound traffic.
in this way wich IP address i have to configure on the Router Ethernet (as default gw of my firewall)....an IP address of ISP1 or ISP2 or an private class IP and then let doing NAT to the router (setting 2 nat, one for link)?
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