tree d21c3129d9c4a6a3c29a06f28c5ddacd365c5e68
parent f8bc0cf290a193505e37ce005e56284f7af5c2b5
author Madhav <madhavadas@google.com> 1617688282 -0700
committer Commit Bot <commit-bot@chromium.org> 1625167542 +0000

shill: Switch T-Mobile from IPv6 only to IPv4v6 (dual stack)

On Qualcomm and Fibocom  devices crostini does not work T-Mobile IPv6 only network,
check https://groups.google.com/a/google.com/g/cros-networking-bugs/c/mpB5YOeTi8Q
and b/162701578. On Fibocom we are unable to connect to IPv6 only network as we get
a Link-local IPv6 address and IPv4 static address, as of now modemmanager ignores ipv4
address in ipv6 only network, causing shill to go in a loop.
So temporarily switching to dual stack for T-Mobile.

BUG=b:172696688,b:162701578, b:183029202

TEST=use T-Mobile IPv4v6 dual stack on trogdor, drallion; run
  cellular_Identifiers.tmobile, cellular_Smoke.tmobile

Change-Id: I05ef48a5dd8f771b4c32c3e1a810098653bec04e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform2/+/2807245
Commit-Queue: Madhav . <madhavadas@google.com>
Tested-by: Madhav . <madhavadas@google.com>
Reviewed-by: Hugo Benichi <hugobenichi@google.com>
Reviewed-by: Taoyu Li <taoyl@chromium.org>
(cherry picked from commit e2c31be2c6dea118b5f77bc9ec1f4f470abdf6e2)
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform2/+/2995317
Reviewed-by: Madhav . <madhavadas@google.com>
Commit-Queue: Hugo Benichi <hugobenichi@google.com>
Tested-by: Hugo Benichi <hugobenichi@google.com>
(cherry picked from commit caf95f7930c0c7fe54a11cb5b868b2aa40a88b89)
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform2/+/3001188