I want to allow simultaneous use of accounts.

However, RFC 2866 says that the Acct-Session-Time

can only be present in Accounting-Request records where the Acct-Status-Type is set to Stop [Page 17]

Does this mean that RADIUS protocol can not manage simultaneous use of an account?

For example, an account with Session-Timeout 2 hours is shared by two users.

User1 login first and use the account for 1 hour,

user2 then login (user1 still accessing the account),

then user2 turns out two have 2 hours, which is wrong and is because that user1 not yet send Acct-Session-Time to the server.

If RADIUS is not suit for the scenario above, should I try other protocols such as DIAMETER and TACACS+?

Thanks.