High High availability remote

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Description: BACKGROUND Internet service providers (ISPs) may use the Remote Authentication Dial-In User Service (RADIUS) protocol, which is an authentication, authorization, and/or accounting system. When a user dials in or otherwise accesses an ISP, for example, theuser may enter a username and a password. This information may be passed to a RADIUS server, which may check the username and password to authorize access to the ISP network and network services. The RADIUS protocol specification is maintained by aworking group of the Internet Engineering Task Force (IETF) as described in RFC 2865 and 2866.SUMMARY According to one aspect, a method may include receiving, in a first server from a second server, a request for a service of a network by a device; sending, from the first server to the second server, a response to the request for the service topermit access to the service; and sending state information about the response to a third server for storage in a database. According to another aspect, a method may include receiving, in a first server from a second server, a request for a connection between a device and a network; receiving, in the first server from a third server, a group of network addresses sentin response to a request for the group of network addresses; caching the group of network addresses in the first server; and sending, from the first server to the second server, one of the group of network address for the connection. According to another aspect, a system may include a first server to receive a request for a connection between a device and a network and to send a network address for the connection in reply to the request for the connection; and a secondserver to receive the request for the connection from the device and to send the request for the connection to the first server; wherein the first server sends state information regarding the connection to a third server for storage in a database.BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings