Route ISP2 0.0.0.0 128.0.0.0 2.2.2.2 // creates a default route for addresses in the second half of the IPv4 sepctrumĢ. Route ISP1 128.0.0.0 128.0.0.0 1.1.1.2 // creates a default route for addresses in the first half of the IPv4 spectrum However with the following commands on the ASA, we can route traffic to half the destinations on the internet using ISP1 and the other half using ISP2: The following two scenarios are ways in which both ISPs can be used simultaneously on the ASA:Īs I mentioned aboved, the ASA is not a load-balancer or a packet-shaper. If however, this is not an option, then it is possible to configure a very crude form of "loadbalancing" on the ASA. If using a router is an option then the network would have to be redesigned as follows: Although the ASA supports route-maps, because it wasn't designed to support extensive routing capabilities, there are quite a few features under route-maps like source-based routing, which are not supported by the ASA. Using route-maps on the router, one can configure the routing in such a way that only certain kind of traffic uses one ISP while the second ISP is used for other kinds of traffic. In such a scenario, the best solution would be to use a router.
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