Patent ID: 8230221

Claim:
A method of authenticating in a Mobile Node a first Advertisement received from an Access Point, the method comprising the steps of: receiving at the Mobile Node from the Access Point the first Advertisement comprising a first Network Prefix, a Nonce Index and a first Hashed Nonce Value; configuring at the Mobile Node a first IP address by use of the first Network Prefix, and concurrently authenticating the first Advertisement by: receiving at the Mobile Node from an Access Router a second Advertisement, the second Advertisement comprising a Nonce Value corresponding to the Nonce Index and a second Network Prefix; hashing at the Mobile Node the Nonce Value to calculate a second Hashed Nonce Value; and comparing at the Mobile Node the first Hashed Nonce Value and the second Hashed Nonce Value; and keeping at the Mobile Node the first IP address if the first Hashed Nonce Value is equal to the second Hashed Nonce Value.