Multi-stack subscriber sign on

A method comprising:

• receiving, with at least one processor circuit, a first request to access the Internet using a first source Internet Protocol address from a subscriber, the first source Internet Protocol address being formatted in accordance with a first version of the Internet Protocol;
• in response to receiving the first request, performing, with the least one processor circuit, a first logon exchange with the subscriber that identifies that the subscriber is authenticated to access the Internet using the first source Internet Protocol address;
• identifying, with the at least one processor circuit, a first subscriber identification of the subscriber in response to the first logon exchange identifying the subscriber as being authenticated to access the Internet using the first source Internet Protocol address;
• sending, with the at least one processor circuit, a link to the subscriber in response to the first logon exchange identifying that the subscriber is authenticated to access the Internet using the first source Internet Protocol address, wherein the link comprises a resource that is accessible via a second version of the Internet Protocol and a second subscriber identification of the subscriber, wherein the link, upon being activated, causes the subscriber to generate a second request to access the Internet using a second source Internet Protocol address of the subscriber, the second source Internet Protocol address formatted in accordance with the second version of the Internet Protocol, wherein the second request includes the second source Internet Protocol address and the second subscriber identification of the subscriber;
• receiving, with the at least one processor circuit, the second request to access the Internet using a second source Internet Protocol address from the subscriber;
• comparing, with the at least one processor circuit, the second subscriber identification included in the second request with the first subscriber identification;
• and
• determining, with the at least one processor circuit, that the subscriber is authenticated to access the Internet using the second source Internet Protocol address based on comparing the second subscriber identification with the first subscriber identification.

One or more non-transitory computer readable tangible storage media encoded with software comprising computer executable instructions that when executed:

• store a first subscriber identification of a subscriber in a memory, the first subscriber identification being stored in response to a logon exchange with the subscriber that identifies that the subscriber is authenticated to access the Internet using a first source Internet Protocol address of the subscriber, wherein the first source Internet Protocol address is formatted in accordance with a first version of the Internet Protocol;
• send a link to the subscriber in response to the subscriber being authenticated to access the Internet using the first source Internet Protocol address, wherein the link comprises a resource that is accessible via a second version of the Internet Protocol and a second subscriber identification of the subscriber, wherein the link, upon being activated, causes the subscriber to generate a request to access the Internet using a second source Internet Protocol address of the subscriber, the second source Internet Protocol address formatted in accordance with the second version of the Internet Protocol, wherein the second request includes the second source Internet Protocol address and the second subscriber identification of the subscriber;
• receive the request to access the Internet from the subscriber using the second source Internet Protocol address of the subscriber;
• compare the second subscriber identification included in the request with the stored first subscriber identification;
• and
• determine that the subscriber is authenticated to access the Internet using the second source Internet Protocol address based on the comparison of the second subscriber identification with the first subscriber identification.