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New Member

Multiple ISP Redundancy Setup

We hv a customer setup as per attached topology.

Primary leased line with ISDN fallback from Service Provider-1.

Proposed Secondary backup on RF from Service Provider-2.

Router used = Cisco 1800 series.

Objective :- To achieve Link redundancy for inbound and outbound internet traffic.

Hosted servers with natted public IP should be reachable if ISP-1 or ISP-2 link is down.

Pls suggest if we can acheive it and how.

3 REPLIES
New Member

Re: Multiple ISP Redundancy Setup

Hello,

here is my suggestion :

int ethernet 0

ip address 192.168.1.1 255.255.255.0

ip nat inside

int serial x/y

ip address x.x.x.x x.x.x.x

ip nat outside

int brix/x

int dialer 1

ip address y.y.y.y y.y.y.y (or ip add negociated)

ip nat outside

int ethernet 1

ip address z.z.z.z z.z.z.z

ip nat outside

ip route 0.0.0.0 0.0.0.0 serial x/y

ip route 0.0.0.0 0.0.0.0 dialer 1 220

ip route 0.0.0.0 0.0.0.0 ethernet 1 230

ip nat inside source list 101 pool pool-name [overload]

poo-name is with you registred ip address?

access-list 101 permit ip 192.168.1.0 0.0.0.255 any

Are you using same registered ip address on both ISP?

then second ISP need to advertize it with lower priority

HTH,

cisand

New Member

Re: Multiple ISP Redundancy Setup

Second ISP address will be registered but different from primary ISP public IP's.

Pls advice.

Objective is to use the RF link in standby mode and it should get activated only after primary link (Lease+ISDN) is down.

regards

New Member

Re: Multiple ISP Redundancy Setup

Hi,

Have you had any joy with this? I am looking to do a similar config at work.

Graham

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