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wwan: enable ipv6 by default in ModemManager backend

Richard Acayan requested to merge flamingradian/NetworkManager:wwan-mm-ipv6-default into main

Summary

This merge request changes the ModemManager backend to configure a dual-stack IPv4v6 WWAN connection by default.

CC: @aleksm (author of referenced commit)

Purpose

Most carrier networks are expected to work with no special configuration. Some networks require IPv6, but IPv6 is disabled by default for ModemManager connections. A fallback is already implemented in nm_modem_get_connection_ip_type, which works best if IPv4 and IPv6 are both enabled.

Checklist

Please read https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/blob/main/CONTRIBUTING.md before opening the merge request. In particular, check that:

  • the subject for all commits is concise and explicative
  • the message for all commits explains the reason for the change
  • the source is properly formatted
  • any relevant documentation is up to date Documentation for the default was not found except for the comment shown in the diff.
  • you have added unit tests if applicable This is a change to defaults, which are usually not tied to testing.
  • the NEWS file is updated when the change deserves to be mentioned, for example for new features, behavior changes, API deprecations, etc. The change does not require intervention for existing use cases.

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