On Chrome Remote Desktop for iOS, if all of these are true:
* Enable the PORTALLOCATOR_DISABLE_COSTLY_NETWORKS flag.
* Connect an iPhone to a Mac.
* Turn off WiFi on the iPhone and keep mobile data on.
* Connect to a host on a different network from iPhone.
Then the connection can never succeed. The reason is that iOS uses a
special network interface with link-local IP to communicate with the Mac.
BasicPortAllocator sees that interface and thinks it costs less than the
cellular networks, then it removes all cellular networks. However, that
link-local network cannot connect to a peer on external network.
This CL changes the behavior of the PORTALLOCATOR_DISABLE_COSTLY_NETWORKS
so that it ignores the cost of link-local networks when determining the
lowest network cost.
Bug: webrtc:8780
Change-Id: I9bde50426b356fdbf89d4b826fc7b28c8c523c10
Reviewed-on: https://webrtc-review.googlesource.com/41460
Commit-Queue: Yuwei Huang <yuweih@google.com>
Reviewed-by: Taylor Brandstetter <deadbeef@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21738}
b181f71ee7