Object Tracking with Tool Command Language, Any experience?

Unanswered Question
Jun 20th, 2008

I have 2 ISPs terminating on my 851 Router. I want to auto switch my traffic to second ISP once first one is unavailable. NATing should be used for both ISPs with different IPs obviously.

Is object tracking with TCL works? which IOS supports both features? sample config :) & if there is any alternate solution?

many thanks in advance.

I have this problem too.
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Nagendra Kumar ... Fri, 06/20/2008 - 04:29


Configure 2 static default route one point to your primary ISP and other to your secondary but with higher admin distnace as below,

ip route

ip route 200

Now configure NAT with route-map to match the source address as well the outgoing interface.

access-list 1 permit any

route-map PRIMARY permit 10

match ip address 1

match interface

route-map SECONDARY permit 10

match ip address 1

match interface

ip nat inside source route-map PRIMARY pool POOL1 overload

ip nat inside source route-map SECONDARY pool POOL2 overload



Farhan Jaffer Sun, 06/22/2008 - 23:03

Hi Nagendra,

Thanks for this idea. But will it suitable for Cisco 851?

I have 4 LAN interfaces & 1 WAN interface. Which IOS will support to enable multiple VLANs on LAN interfaces?

Second point is, interface will remain up even the link is down, then higher AD will not work, what do u say?




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