06-20-2008 03:10 AM - edited 03-03-2019 10:26 PM
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.
06-20-2008 04:29 AM
Hi,
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 0.0.0.0 0.0.0.0
ip route 0.0.0.0 0.0.0.0
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
HTH,
Nagendra
06-22-2008 11:03 PM
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?
Thanks.
-FJ
06-22-2008 11:49 PM
for the second point you can use the feature: Reliable Static Routing Backup.
http://www.cisco.com/en/US/docs/ios/12_3/12_3x/12_3xe/feature/guide/dbackupx.html
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