Good evening

We have a lot of public /30s in our network for simple point to point links between base stations and with the shortage of v4 beginning to bite, I wondered is there another way of using internal addressing for these links without OSPF causing issues? In the past, we have tried internal /30s between routers but had customers unable to get internet. Enabling NAT on the core routers solved this but natted everything else despite the customers being given a real IP for their endpoint.

Network segment layout is as follows

Customer router<----PPPoE----->Base station (pppsvr) <-----/30----->Base station <-----/30----->core-router<----internet---->

One idea I had was to change everything to internal addressing and set up MPLS then have a VPLS instance to each base station and run a central PPPoE concentrator in our datacenter. The problems with this setup is loss of the data-center or the concentrator would cause a 100% outage everywhere. It would also require me to take down almost the entire network to implement.

Any ideas would be grateful.

Thanks in advance

Jon

I would consider the CGN NAT range for this as it's not publicly routable

100.64.0.0/10

We use it extensively in our designs for PTP addressing where public addresses would otherwise be used. It works very well.

You can then use a public loopback to NAT the traffic to. Here is an example:

One idea I had was to change everything to internal addressing and set up MPLS then have a VPLS instance to each base station and run a central PPPoE concentrator in our datacenter. The problems with this setup is loss of the data-center or the concentrator would cause a 100% outage everywhere. It would also require me to take down almost the entire network to implement.

You can very easily run multiple PPPoE concentrators to avoid an outage. It also allows you to scale PPPoE connections as needed.

https://stubarea51.net/2018/04/23/pppoe ... atorsbras/