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Beginner

Problem with NAT and load balance

I need help configuring my router, I have 2 internet connections:

FIRST ONE:

63.245.89.81

255.255.255.248

SECOND:

65.165.87.177

255.255.255.240

I have a Cisco 3725 with 4 Fastethernet ports, also I have the “C” class 69.79.30.0, that one is attached to the 63.245.89.82, that “C” class is for my customers, and the other public ip’s are needed for my servers.

With these 2 internet connections I need to do the NAT of the “C” class and load balance so the “C” class never goes down, my actual configuration is working on a AS5350 with only one internet provider, the configuration is working fine, but now I need to use the 3725 and connect the other ISP to manage redundancy so the “C” class never goes down and also to load balance the ISP’s bandwith, this is my actual configuration on the AS5350:

*************************************************

ATACHED

The other configuration on the 3725 is:

*****************

ATACHED

This configuration is NOT working OK, can anyone help me please.

3 REPLIES 3
Highlighted
VIP Mentor

Re: Problem with NAT and load balance

Hello,

from what I can see in your non-working configuration, you are using the same address space on two different interfaces:

interface FastEthernet0/0

ip address 63.245.89.83 255.255.255.248

interface FastEthernet1/0

description connected to metrored

ip address 63.245.89.82 255.255.255.248

The router should actually generate an error message telling you that there is an overlapping address space once you try and 'no shut' the FastEthernet1/0 interface.

Regards,

GP

Highlighted
Beginner

Re: Problem with NAT and load balance

I have the configuration this way because the working router is connected, and I am using the 63.245.89.83 to configure the NON working router.

Besides that, do you see any other issue?

Thanks,

Highlighted
VIP Mentor

Re: Problem with NAT and load balance

Hello,

from your post I take it that this works when you are only connected to one ISP. Can you post the output of 'debug ip routing' when you fail over from one to the other FastEthernet interfaces ?

Regards,

GP

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