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connect: store IPv6 connection status after valid connection #2053
I am seeing a similar issue sending https requests on Android. I start sending requests over mobile cell data link with wi-fi disabled to an ipv6 server endpoint.. I enable wi-fi and set CURLOPT_INTERFACE to "wlan0". Requests continue to go, now over wifi as ipv4 packets.
As soon as Linux declares the mobile data link dormant, and disconnects, requests over wi-fi begin to fail with CURLE_COULDNT_CONNECT (7). tcpdump shows all traffic to and from the server endpoint has stopped.
I thought this bug sounded like the issue I'm seeing, but implementing this fix didn't help. I am using libcurl 7.43.0. I didn't see any other issues that sounded ike mine so I have held off upgrading to the newest release.
Anyone have any thoughts or suggestions?