Cisco Cisco 4G LTE Enhanced High-Speed WAN Interface Cards for Europe

Page 20 of 63

ip local policy route-map track-primary-if

!local policy to swtich NAT when the primary to backup switch-over happens

ip nat inside source route-map nat2dsl interface Dialer2 overload

!NAT entry for primary internface

ip nat inside source route-map nat2cell interface Cellular0/0/0 overload

!NAT entry for the backup interface

ip route 0.0.0.0 0.0.0.0 Dialer2 track 234

!primary route being tracked by 234 track defined earlier

ip route 0.0.0.0 0.0.0.0 Cellular0/0/0 254

!Backup router with higher admin distance (254), this will become primary when
track fails

ip sla 1

icmp-echo 128.107.248.252 source-interface Dialer2

frequency 2000

ip sla schedule 1 life forever start-time now

!IP SLA defines the IP address to ping to and how often, when ping fails, the

dialer-list 1 protocol ip permit

!dialer list 1 allows the dialer group 1 to dial out for any IP packet

route-map track-primary-if permit 10

match ip address 102

set interface Dialer2 Null0

!to make sure we are sending tracking pings only via primary

route-map nat2dsl permit 10

match ip address 101

match interface Dialer2

route-map nat2cell permit 10

match ip address 101

match interface Cellular0/0/0

!above route maps (nat2cell and nat2dsl) to choose correct interface in use to
NAT