To expand on this is little:
- if you want to use a single pool ("/ip pool" on RouterOS) for multiple PPPoE servers on a single RouterOS system (single RB / CCR / CHR), you can, just configure it in the profiles / secrets
- if you want to use a single IP "pool / range" shared across multiple separate systems (multiple RBs / CCRs / CHRs), you will need a Radius server that centrally manages and gives out IPs to the various PPPoE servers
- configuration management, automation and backup solution
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