Authenticated routing

  • Hi guys,

    imagine there was a bigger network with like 50-100 users and they're all within the same collision domain.
    I would like to give people the opportunity to use this network completely free but then only for communication within that collision domain / broadcast domain. People who participate in paying for the uplink may as well use it.
    For that purpose I would like to give those  people the possibility to securely authenticate agains my router.

    I keep thinking of VPN based solutions for that but the encryption is way to much overhead and CPU hungry you could imagine.
    What comes to your heads for such a scenario?

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