![]() Ip nat inside source route-map backup interface FastEthernet0/1 overload Note: ACL internet allows traffic from the LAN.Ĥ) Configure the two NAT statements required so that either interface can provide NATting, out each respective WAN interface: ![]() Here i am going to post only Home Router confiugation which is used in Lab invironment as HOME.RTR for detail click on mentioned url.ġ) Configure each WAN interface to connect to each ISP, respectively:Ģ) Create the Route Maps that will be used for NATting traffic: Small business with a single router (i.e Cisco 1900/2800/2900 ISR), has two ISPs, and would like to use one ISP as the main provider, and the second ISP as a backup in case the first one fails. This is an generic example of how to configure NAT when there are multiple ISP’s for internet connectivity and we want proper Failover we can say that when Primary ISP goes down then Secondary takes over with correct NAT happening using the secondary ISP’s public ip address. The secondary WAN port can be used in a simple active/passive setup, where traffic is only routed through the secondary WAN port if the primary WAN port is down and/or unavailable. WAN Failover and Load Balancing allows you to designate the Router interface or one of the user-assigned interfaces as a Secondary or backup WAN port.
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