how to assign multiple ip addresses to a cisco router interface

[n.bokhar1]

hi i have 10 private ip address i want to assign them to one interface on my router and then use nat to pat some of them and also static nat and port forward the rest how can i achieve that i have a 4331 router

[Kevin SAS · Accepted solution]

Hi,

If I understand well, you should configure something like that :

int Gi 0/0

desc IN

ip address 192.168.1.1 255.255.255.0

ip address 192.168.2.1 255.255.255.0 secondary

ip address 192.168.3.1 255.255.255.0 secondary

ip nat inside

int dialer 0

desc OUT

ip nat out

And then configure your pat as usual :

ip nat inside source static tcp 192.168.2.10 80 int dialer 0 80

Then access to the required through 

Dialer_IP:80

Verify your ppat with "show ip nat transl"

Hope it helps

[Georg Pauwen · Accepted solution]

Hello,

you can assign multiple IP addresses to the same interface, and then use NAT/PAT the same way as if you would use the primary IP address.

Is this what you are asking ?

Below is what I mean:

interface FastEthernet0/0

description WAN interface

ip address 192.168.1.1 255.255.255.0

ip address 192.168.2.1 255.255.255.0 secondary

ip address 192.168.3.1 255.255.255.0 secondary

ip nat pool NAT1 192.168.2.1 192.168.2.1 netmask 255.255.255.0

ip nat inside source list 1 pool NAT1 overload

ip nat inside source static tcp 10.10.10.1 80 192.168.3.1 80 extendable

[mrmadgig]

Hello

I know this is an old thread but I have the same router and cannot get this to work. There is a bug for this but can you tell me what IOS XE you are running? 

Thank you

Joseph

[n.bokhar1]

thanks guys it worked perfectly

[mrmadgig]

Sorry for wrong placement of reply

Hello

I know this is an old thread but I have the same router and cannot get this to work. There is a bug for this but can you tell me what IOS XE you are running?





Thank you

Joseph

[Piotr Brzeszkiewicz]

@n.bokhar1 which solution works perfectly? Kevin's or George's?

[Georg Pauwen]

Hello,

both 'solutions' essentially say the same thing. You can either use static NAT and secondary addresses, or put the secondary address in a pool and use that pool for dynamic NAT.