Overlay network ingress edge region selection

This disclosure relates to enhanced overlay network-based transport of traffic to and from customer branch office locations, facilitated through the use of the Internet-based overlay routing. A method of selecting an ingress edge region of the overlay network begins by mapping a service hostname to an IKEv2 destination of an outer IPsec tunnel associated with a first overlay network edge. An IKEv2 session is established from the first overlay network edge to the customer router. Upon tunnel establishment, a secondary lookup is performed to determine whether the first overlay network edge is an appropriate ingress region. Based on a response to the secondary lookup, a IKEv2 redirect is issued to a second overlay network edge. A new tunnel is then established from the second overlay network edge to the customer router. Thereafter, an additional lookup may also be performed to determine whether the second overlay network edge remains an appropriate ingress region.