Multiple Wan IP on a Single router fastethernet interface

[mr.imranmohd]

Hi,

My Scenario will be like this (Please see the attached image)

Cloud (ISP)

     |

Core Router

     |

Firewall

My Core Router Configuration as follows:

interface FastEthernet0/0

ip address 78.*.*.* 255.255.255.*

duplex auto

speed auto

!

interface FastEthernet0/1

description "Connection to ISP"

ip address 89.*.*.* 255.255.255.*

duplex auto

speed auto

!

Now We recently purchased the following Public ip as follows :

78.*.*.* (for router)

78.*.*.* (for Host)

My Question is where and how can i configure the new router public ip inorder to access the public host ip?

[kcnajaf]

HI Imran,

You could assign the new ip address as secondary ip address even though it is not a good practice to run the secondary ip address. Like

interface FastEthernet0/1

description "Connection to ISP"

ip address 89.*.*.* 255.255.255.*

ip address 78.*.*.* 255.255.255.* secondary

duplex auto

speed auto

Hope that helps.

Regards

Najaf

Please rate when applicable or helpful !!!

[mr.imranmohd]

Dear Najaf,

Thaks for your support, i tried as you suggest; still its not working

#interface FastEthernet0/1

#ip address 89.*.*.* 255.255.255.*

#ip address 78.*.*.* 255.255.255.* secondary

#no shut

Even i tried the following but not working;

Primary_Router_HO(config)#inte fa0/1.1

Primary_Router_HO(config-subif)#ip address 78.*.*.* 255.255.255.*

% Configuring IP routing on a LAN subinterface is only allowed if that

subinterface is already configured as part of an IEEE 802.10, IEEE 802.1Q,

or ISL vLAN.

Primary_Router_HO(config-subif)#

Looking forward to your reply.

[mr.imranmohd]

i have added the secondary ip to the fastethernet interface of my router

now i can ping this address from my lan

I have already added the Acl and Natting (for my local ip(10.10.3.5) to public ip)

But nothing is working.

I configured exactly same as old config; but unable to ping new public router ip as well as host ip..

[jawad-mukhtar]

u have to assing ip with /30 mask on your public interface.

*** Do Rate Helpful posts ***

[kcnajaf]

Hi,

Could you please share your configurations?

Regards

Najaf

[mr.imranmohd]

I ask my provider to check the settings;

Anyhow now this is working without any changes.

Thanks for your valuable time and considerations.