I believe I understand you. You can use PPPoE to assign a whole /27 to a tower like we do. You route the /27 as a blackhole. The Mikrotik will assign the public to the device that will use PPPoE. You waste no ip addresses that way.

John Babineaux
Network Admin
Radio Communications Service
Crowley, Louisiana


On 9/21/2011 12:40 PM, Bill Prince wrote:

We are running short on IP addresses, and I wonder if there is a way to do this without splitting a subnet and losing the overhead IPs for a subnet.

I have a remote tower serving a handful of subscribers, and am using an RB450 to NAT them through a single IP.

We are now hooking up a new sub that requires a dedicated, non-NATed IP. Is there a way to pass through an additional IP without burning a small subnet?

Say the RB450 is NATing most of the subs through 1.2.3.122

And I want to put the dedicated sub on 1.2.3.124 (or something).

How do I handle the fact that the gateway for both for 1.2.3.124 is not on the same subnet?





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