what is the simplest way to create backup WAN connection?

[b1723651]

Hi all,

can anyone tell me what is the simplest way to create backup WAN connection?

I have setup 2 WAN connection(2 ISP, 1 is DIA w/ fix ip, 2 is 3G), but if I enable both interface ,then I unplug WAN 1. no traffic goes to WAN 2.

I have already have 3G connection enable all the time (w/ command "dialer persistent")

my seario is:

Cisco 2811+ Cisco-HWIC-3G,

Thanks guys.

[letsgomets]

How does the 3G connection get its IP configuration? Is this a static config or dynamic?

Unplug your WAN 1 connection and do a "show ip route"

Do you have a default route in that list?

Is the default route going to the correct next hop?

Are you running a routing protocol on either connection?

[b1723651]

thanks

Gateway of last resort is 21.21.14.8 to network 0.0.0.0

S*    0.0.0.0/0 [1/0] via 21.21.14.8
      10.0.0.0/32 is subnetted, 1 subnets
C        10.8.42.77 is directly connected, Dialer0
      172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
C        172.16.0.0/18 is directly connected, FastEthernet0/1
L        172.16.0.200/32 is directly connected, FastEthernet0/1

default routing is going to 21.21.14.8, while wan 1 is up, the route works.

and don't have any dynamic routing protocols up now.

[joe.lazzaro · Accepted solution]

Ivan has 2 write-ups that fit your scenario...

Small Site Multi-Homing
http://www.nil.com/ipcorner/SmallSiteMultiHoming

Redundant Small Site Multi-Homing
http://www.nil.com/ipcorner/RedundantMultiHoming

[b1723651]

thanks, seems its what I'm looking for. will try it