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Connect two internet lines on the same cisco router 3945 series

eng.taher_gabr
Level 1
Level 1

i have two internet lines from the same provider and i have one router i want to connect the two lines in the same router

 

any ideas !!!!!!!!!!!!!

7 Replies 7

Ashok Kumar
Cisco Employee
Cisco Employee

Hi,

You can put 2 default routes towards your ISP's next ip if the next hop ip for the both lines are different, this will do the destination based load sharing.

ip route 0.0.0.0 0.0.0.0 <1st next-hop-ip> 

ip route 0.0.0.0 0.0.0.0 <2nd next-hop-ip>

- Ashok

HI Ashok

you mean

 1- i make nat outside for the two isp interface

2- then i add two default routes for the two ISPs

 

so when the traffic came from my LAN how the router will handle it ???

 

 

 

 

thanks 

Hi,

NATing usually a done on the firewall in such scenario.

but if you want to it on router, below will help:

https://learningnetwork.cisco.com/thread/44625

 

HI Ashok

 

sorry 

 

i mean Pating

 

Hi,

No problem, similar treatment. Follow 

1. Create IP SLA/Track for both internet link

2. Break your LAN subnet into 2 smaller subnet

3. Create route map, Match with 1 subnet & route the traffic towards 1st internet link

route-map General_Internet_Traffic permit 10

match ip address 115

set ip next-hop verify-availability 10.1.1.1 track 1

set ip next-hop verify-availability 11.1.1.1 track 2

4. Create route map, Match with 2 subnet & route the traffic towards 2nd internet link

5. Configure NATing/PATing over the interface, selecting by route-map 

ip nat inside source route-map General_Internet_Traffic interface FastEthernet0/0 overload

 

- Ashok

 

 

hi 

 

WHY two smaller subnets  ???????

Hi , 

To load balance your traffic , to use Active-Active link scenario.

if you don't want than simply skip the step, configure it in primary/secondary scenario.

- Ashok

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