[AusNOG] Cisco help (Configure a dual failover wan on cisco 1811)

[John Edwards]

Hi Karl,

If BGP or another routing protocol isn't available, have a look (or google) at the "ip sla" and "track" commands, and "ip route 0.0.0.0 0.0.0.0 <dst> track ..." command.

John


On 26/05/2010, at 12:52 PM, Karl Kloppenborg wrote:

> Hi Noggers,
> 
> Okay so here is the scenario,
> I have one Cisco 1811 integrated services router with a number of Fast Ethernet interfaces on it,
> 
> What I want to do is make a dual Wan failover setup with the following configuration
> (Note: I am not asking someone to just give me a config because I won't learn that what, but pointers and tips are most welcome :D)
> 
> Wan1 (Primary internet connection)
> 	Interface: FastEthernet0
> 	IP Address: Static
> 
> Wan2 (Backup Internet connection)
> 	Interface: FastEthernet1
> 	IP Address: Assigned by PPPoE Client (Modem is in bridged mode so need to authenticate with some type of dialer interface + PPPoE)
> 
> NAT0 (VLAN1)
> 	Interface: FastEthernet2
> 	IP Address: 10.0.2.1 / 24
> 	Services: QOS / Port Forwarding / DHCP / Firewall / DPI
> 
> Notes:
> Okay so basically I need the LAN traffic to route through the primary int, but in the event that it is lost (Modem dies or even better if it looses ping with the next hop) then switch over to WAN2
> Alternatively let me manually switch between the gateways
> 
> ip route 0.0.0.0 0.0.0.0 FastEthernet0 
> no ip route 0.0.0.0 0.0.0.0 FastEthernet1 //Turn this one on when the Primary interwebs drops and turn the FastEthernet IP route off ?
> 
> Any help much appreciated!
> 
> 
> Cheers!
> Karl Kloppenborg
> P 02 8014 4253  EXT:104  | M 0438475892  |  www.karltec.net
> 
> Please consider the environment before printing this email. Think before you print. 
> 
> 
> 
> 
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