[Cisco] IOS NAT Load-Balancing for Two ISP Connections
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interface FastEthernet0 ip address dhcp ip nat outside ip virtual-reassembly ! interface FastEthernet1 no ip address pppoe enable no cdp enable ! interface FastEthernet2 no cdp enable ! ! interface Vlan1 description LAN Interface ip address 192.168.108.1 255.255.255.0 ip nat inside ip virtual-reassembly ip tcp adjust-mss 1452 !---Define LAN-facing interfaces with "ip nat inside". ! ! Interface Dialer 0 description PPPoX dialer ip address negotiated ip nat outside ip virtual-reassembly ip tcp adjust-mss !---Define ISP-facing interfaces with "ip nat outside". ! ip route 0.0.0.0 0.0.0.0 dialer 0 track 123 ! ! ip nat inside source route-map fixed-nat interface Dialer0 overload ip nat inside source route-map dhcp-nat interface FastEthernet0 overload ! !--- Configure NAT overload (PAT) in order to use route-maps. ! access-list 110 permit ip 192.168.108.0 0.0.0.255 any ! !--- Define ACLs for traffic that are NATed to !--- the ISP connections. ! route-map fixed-nat permit 10 match ip address 110 match interface Dialer0 ! route-map dhcp-nat permit 10 match ip address 110 match interface FastEthernet0
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