TUN-6503: Fix transport fallback from QUIC in face of dial error "no network activity"

Author: nmldiegues

CHANGES.md

@@ -1,3 +1,10 @@
+## 2022.7.1
+### New Features
+- It is now possible to connect cloudflared tunnel to Cloudflare Global Network with IPv6. See `cloudflared tunnel --help` and look for `edge-ip-version` for more information. For now, the default behavior is to still connect with IPv4 only.
+
+### Bug Fixes
+- Several bug fixes related with QUIC transport (used between cloudflared tunnel and Cloudflare Global Network). Updating to this version is highly recommended.
+
 ## 2022.4.0
 ### Bug Fixes
 - `cloudflared tunnel run` no longer logs the Tunnel token or JSON credentials in clear text as those are the secret

cmd/cloudflared/tunnel/cmd.go

@@ -528,7 +528,7 @@ func tunnelFlags(shouldHide bool) []cli.Flag {
 			Usage:   "Cloudflare Edge ip address version to connect with. {4, 6, auto}",
 			EnvVars: []string{"TUNNEL_EDGE_IP_VERSION"},
 			Value:   "4",
-			Hidden:  true,
+			Hidden:  false,
 		}),
 		altsrc.NewStringFlag(&cli.StringFlag{
 			Name:    tlsconfig.CaCertFlag,

supervisor/tunnel.go

@@ -412,8 +412,7 @@ func ServeTunnel(
 			}
 			return err.Cause, !err.Permanent
 		case *connection.EdgeQuicDialError:
-			// Don't retry connection for a dial error
-			return err, false
+			return err, true
 		case ReconnectSignal:
 			connLog.Logger().Info().
 				IPAddr(connection.LogFieldIPAddress, addr.UDP.IP).