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Reliance on using IP addresses to authenticate users prevents some university libraries from moving to fully federated access to online resources. Despite the many disadvantages of controlling access using IP addresses, they are relatively simple to set up at a small scale, and can be useful in two contexts: accessing out-dated eresources that do not support modern authentication (which has been explored by AARC here in another pilot) and providing access to "walk-in" users.
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