Map a /24 to another /24

bill · ‎09-09-2016

I'm not sure if this is even possible with a cisco router or if i need something like a Sonicwall. At certain times i may have two class C address spaces coming in over a Verizon link. I have a 208.x.x.0/24 and a 63.x.x.0/24 and what i'd like to do is if traffic is destined for 208.x.x.2 have it map to 63.x.x.2 and so on for the entire address space. Some may call this one-to-one nat but usually refers to if you're mapping a public to an internal IP. i'm trying to map a public to another public when it comes in on the same interface.

Luke Oxley · ‎09-10-2016

[@bill@emergency24.com],

Thanks for your post. I've had a read and am struggling to understand what you need. Could you describe your environment and in detail what you wish to achieve?

Many thanks,

Luke

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bill · ‎09-12-2016

We have two data centers. Data center A is our main data center and data center B is a backup data center. Data center A has the 208.x.x.0/24 address space and devices in the field are sending us traffic to the 208.x.x.0 address space. These devices don't use DNS so the 208.x.x.0 address is hard coded. Data center B has the 63.x.x.0 address space with identical devices as in data center A and they share the last octet. For example, device 1 in data center A has ip address 208.x.x.5 and the identical device in data center B has ip 63.x.x.5. The 208.x.x.0 space is part of the prefix list on the circuit in data center B so we can easily route the 208.x.x.0 space to data center B but we can't change the ip's of any of the devices. What i'd like to do if possible with a Cisco is if we had to route the 208.x.x.0 space to data center B is it possible for traffic designated for 208.x.x.5 to get translated to 63.x.x.5. To get the 208.x.x.0 space to data center B i would stop advertising it on the router in data center A then advertise it on the router in data center B and yes we are using BGP.

I hope this makes sense. As i said i don't know if a Cisco router can do this or if i should be looking at a Sonicwall.