Hi All,
I hope this finds you well. A quick message to pick your brains if I may with a current issue I have on my Cisco 2921 router.
In short, we have two physical interfaces - one internal (0/2), one external (0/0). The internal interface has several sub-interfaces of which one has a Public Subnet applied to it (0/2.100), and another sub-interface has a NAT'd Subnet applied to it (0/2.101).
The traffic from the NAT'd subnet (0/2.101) appears online as the Public IP Address on the first physical inteface (0/0), as expected, when you lookup your Public IP Address online. We need to move this NAT'd Subnet to appear as one of the Public IP Addresses from within the other sub-interface (0/2.100).
My question is, how would I achieve this. This is the current configuration including the two physical interfaces, and the two sub-interfaces:
interface GigabitEthernet0/0
ip address 31.210.XX.XX 255.255.255.248
ip nat outside
ip virtual-reassembly in
duplex auto
speed auto
!
interface GigabitEthernet0/2
no ip address
duplex auto
speed auto
!
interface GigabitEthernet0/2.100
encapsulation dot1Q 100
ip address 31.210.XX.XXX 255.255.255.240
!
interface GigabitEthernet0/2.101
encapsulation dot1Q 101
ip address 192.168.1.254 255.255.255.0
ip nat inside
ip virtual-reassembly in
To summarise, we would like the NAT'd sub-interface (0/2.101) to use one of the IP Addresses in the other sub-interface (0/2.100) as it's Public address. I hope that makes sense, thanks in advance for your help and of course ask any further questions you may have!
All the best,
Matthew
