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This patch series adds support for IPv6 allocations. If not specified otherwise in the ALLOCATE request, clients will get an IP4 allocation. They can also request an IPv6 address or an additional IPv6 address in addition to their IPv4 address. Either of those is only possible if the relay actually has a listening socket for the requested address family. The CLI is designed such that the user can either specify IP4, IP6 or both of them. The `Server` component handles all of this logic and responds with either a successful allocation response or an Address Family Not Supported error (see https://www.rfc-editor.org/rfc/rfc8656#name-stun-error-response-codes). Multiple refactorings were necessary to achieve this design, they are all extracted into separate PRs: Depends-On: #1831. Depends-On: #1832. Depends-On: #1833. --------- Co-authored-by: Jamil <jamilbk@users.noreply.github.com>