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How do I configure Dual WAN on Cisco 1721 for sharing bandwidth and failover?

Posted on 2010-08-25
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Last Modified: 2012-05-10
I have a Cisco 1721 with a Wic1-ADSL and a WIC 4ESW installed.  I have DSL service and fixed-wireless service.  I have a /29 for both connections.  I would like a config which bundles both connections to share the bandwidth, but also will allow for all traffic to pass to one or the other in case of failure.  I have another device in the house which provides DHCP, wireless, etc so if the combination would just feed a single private IP address (172.30.30.1/30 for example), I can setup my internal router to do the rest.  

I currently have the router configured (not by me) to use the fixed-wireless connection full time, and only failover to the DSL if the wireless goes down.  This works fine, but I hate to pay for the DSL which I will only use a couple times a year in this method.  It would be much better for me if I used both connections concurrently and it would failover to using a single connection in the event that either would fail.

I can provide current config details if necessary, but can anyone help me with this config?

ED7
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Question by:electricd7
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6 Comments
 
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Expert Comment

by:bgoering
ID: 33522104
You can get some primitive outbound load balancing by configuring your router with two default routes

ip route 0.0.0.0 0.0.0.0 ip.of.wireless.network
ip route 0.0.0.0 0.0.0.0 ip.of.dsl.network

Good Luck
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Author Comment

by:electricd7
ID: 33522359
Thanks for the suggestion, but I need a little more help than that.
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LVL 28

Expert Comment

by:bgoering
ID: 33522410
Please go ahead and post the config for your router.
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Author Comment

by:electricd7
ID: 33522440
version 12.4
service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
hostname chad-c1721
!
boot-start-marker
boot-end-marker
!
aaa new-model
!
!
aaa authentication login default local
aaa authorization network default local
!
aaa session-id common
memory-size iomem 15
clock timezone EST -5
clock summer-time EDT recurring
ip cef
!
!
ip auth-proxy max-nodata-conns 3
ip admission max-nodata-conns 3
!
!
no ip domain lookup
ip domain name joink.com
ip name-server 63.134.128.164
ip name-server 63.134.128.165
ip name-server 63.134.128.162
ip name-server 63.134.128.163
ip sla monitor 100
 type echo protocol ipIcmpEcho 63.134.155.225 source-interface FastEthernet0
 timeout 500
 frequency 3
ip sla monitor schedule 100 life forever start-time now
!
!
!
!
!
ip ssh time-out 60
ip ssh authentication-retries 2
ip ssh version 2
!
track 100 rtr 100 reachability
 delay down 5 up 10
!
!
!
!
interface ATM0
 no ip address
 no atm ilmi-keepalive
 dsl operating-mode auto
 hold-queue 224 in
!
interface ATM0.1 point-to-point
 description ** DSL **
 ip address 63.134.180.106 255.255.255.248
 ip nat outside
 ip virtual-reassembly
 pvc 0/35
 !
!
interface FastEthernet0
 ip address 63.134.155.228 255.255.255.248
 ip nat outside
 ip virtual-reassembly
 speed auto
!
interface FastEthernet1
!
interface FastEthernet2
!
interface FastEthernet3
!
interface FastEthernet4
!
interface Vlan1
 ip address 172.30.30.1 255.255.255.252
 ip nat inside
 ip virtual-reassembly
!
ip local policy route-map LocalPolicy
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 63.134.155.225 10 track 100
ip route 0.0.0.0 0.0.0.0 63.134.180.105 251
!
no ip http server
no ip http secure-server
ip nat inside source route-map DSL interface ATM0.1 overload
ip nat inside source route-map Wireless interface FastEthernet0 overload
ip nat inside source static tcp 172.30.30.1 23 63.134.155.228 23 extendable
ip nat inside source static tcp 172.30.30.1 22 63.134.155.228 2222 extendable
ip nat inside source static tcp 172.30.30.1 23 63.134.180.106 23 extendable
ip nat inside source static tcp 172.30.30.1 22 63.134.180.106 2222 extendable
!
ip access-list extended PingWireless
 permit icmp host 63.134.155.228 host 63.134.155.225
!
route-map Wireless permit 10
 match interface FastEthernet0
!
route-map DSL permit 10
 match interface ATM0.1
!
route-map LocalPolicy permit 10
 match ip address PingWireless
 set ip next-hop 63.134.155.225
 set interface FastEthernet0
!
!
control-plane
!
!
line con 0
 privilege level 15
line aux 0
line vty 0 4
 privilege level 15
 transport input telnet ssh
!
ntp clock-period 17180089
ntp server 63.134.128.162
ntp server 63.134.128.163
ntp server 63.134.128.164
ntp server 63.134.128.165
end
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LVL 28

Accepted Solution

by:
bgoering earned 500 total points
ID: 33522605
I think this document (http://www.cisco.com/en/US/tech/tk648/tk361/technologies_configuration_example09186a00808d2b72.shtml) describes pretty closely what you are trying to do.

If not let me know how it differs
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Author Comment

by:electricd7
ID: 33522766
Yea that looks promising.  I will give it a shot and report back.  Thanks.
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