IPv4 and IPv6 addresses can be used to establish SD-WAN tunnels over different underlay links.

Huawei's SD-WAN solution supports dual-stack (IPv4/IPv6) networking. This means that overlay tunnels (typically IPsec) can be established regardless of whether the underlying transport network (Internet, MPLS, or LTE) uses IPv4 or IPv6. This is a critical feature for enterprises undergoing transition, allowing them to build a unified virtual private network over heterogeneous physical infrastructures.