Configuration of a cisco c921-4P Dual Wan Port

[scsawyer]

Hello

I need help on setting up the two wan ports on the router for load balancing, they need to be DHCP on the port 4 and 5. I can make it work with one wan port just having figured out how to add the second wan port. any help would be great.

[ashish.kushwaha]

you can add second wan link in router and use IP SLA feature or PBR to perform load balancing.

[Georg Pauwen]

Hello,

post the running configuration of your 921 router. The easiest way to achieve load balancing/load sharing is to just configure two static default routes:

ip route 0.0.0.0 0.0.0.0 WAN_PORT_1

ip route 0.0.0.0 0.0.0.0 WAN_PORT_2

[scsawyer]

Really, i would have figured it would have to more in the Configuration then just that. guess i am over thinking it.

Thanks

[Georg Pauwen]

Hello,

two static routes is probably not really enough. You need to configure th NAT as well, so both interfaces are being used. This would look something like below:

ip nat inside source route-map ISP_1_RM interface WAN_INTERFACE_1 overload
ip nat inside source route-map ISP_2_RM interface WAN_INTERFACE_2 overload
!
access-list 101 permit ip LAN_SUBNET MASK any
!
route-map ISP_1_RM permit 10
match ip address 101
match interface WAN_INTERFACE_1
!
route-map ISP_2_RM permit 10
match ip address 101
match interface WAN_INTERFACE_2

[MHM Cisco World]

Run

Per-packet load shearing 

And config two default route one for each wan port