A policy server determines and explicitly provides a source host with a multipath access policy. The policy server obtains a notification that the source host is connected to an access network. The notification includes authentication credentials of a user of the source computing device. The policy server determines a multipath policy based on the authentication credentials. The multipath policy determines whether data flows from the source host are transmitted over multiple network connections. The policy server determines a set of one or more multipath proxy devices based on the authentication credentials, and provides an access policy to the source host. The access policy includes the multipath policy and network addresses associated with the multipath proxy devices.