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Public or Private IPs

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  • 1.  Public or Private IPs

    Posted Feb 06, 2019 09:11 PM

    Greetings Everyone,


    We currently assign public IPs to both Wired and Wireless users (We own a /16).  We would like to start using private IPs.   


    I've been asked to find out what other higher education institutions are doing as we do expect push back from some in the community.


    If you can share, I would to know which you use.


    If you recently made the transition from public to private did you get push back?  And how did you resolve it?





    Brandeis University

  • 2.  RE: Public or Private IPs

    Posted Feb 07, 2019 08:08 AM

    We use a 10./16 per building then subnet per vlan. Before you start the migration you will need to find out if there are any source/destination (outbound) requirments. For instance our bank whitlists specific IP addresses need either 1 to 1 NAT or a small public NAT pool.


    Inbound should be straight forward.


    Small NAT pools are the way to go and keep it simple.

  • 3.  RE: Public or Private IPs

    Posted Feb 07, 2019 08:51 AM

    Ohio State started its road from IPv4 public to IPv4NAT+IPv6 dual-stack ~3 years ago. We started out of necessity: we were running out of /23s to add to our existing VLAN pools. We leveraged ClearPass to isolate phones/tablets using student credentials (largest population) and started putting them into IPv4NAT /20s frontended by a public /25. After that success, we ended up putting all student devices in that same pool. Overtime, and with our upgrade to ArubaOS8, we've migrate ~90% of our client base to IPv4NAT+IPv6 dual-stack. The only remaining population is our internal LAN for colleges/units that use central IT for all IT services. I won't be surprised if this pool is migrated as well.


    Feel free to PM if you have specific questions.

  • 4.  RE: Public or Private IPs

    Posted Nov 04, 2020 06:25 PM
    All our wired and wireless users are on private addresses. We also were lucky to own a /16 Public but we migrated the majority of our buildings to private. In the dorms, we are still using public addresses for game consoles.

    Nils Lau