[AusNOG] Cisco help (Configure a dual failover wan on cisco1811)

[Oliver Eyre]

If both connections are from the same ISP then you could also look into
NATing via the loopback so that your SSH sessions don't drop when you change
links. 


Oliver

-----Original Message-----
From: ausnog-bounces at lists.ausnog.net
[mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Ryan Benson
Sent: Wednesday, 26 May 2010 2:20 PM
To: Karl Kloppenborg; ausnog at ausnog.net
Subject: Re: [AusNOG] Cisco help (Configure a dual failover wan on
cisco1811)

I recently upgraded a 1800 series from 12.4(22) to 12.4(25c) and it
looks like the syntax of ip sla/track has changed so just watch out if
you do an IOS upgrade some of your config might go walkabout's.

- R

On 26 May 2010 13:33, John Edwards <john at netniche.com.au> wrote:
> 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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