LAN with IPv4 + IPv6

[nhathaway]

There is a problem on LANs with IPv6, where DNS provides both IPv4 and IPv6 addresses. TVHeadend itself only serves on IPv4, even if the box it is on is dual stack. When getting the name (from DNS), TVHGuide picks up the IPv6 address in preference over the IPv4, and tries to connect on IPv6, which results in connection refused.

[rsiebert]

Thanks for reporting. I'll look into this.

[nhathaway]

It turns out, you can start up TVHeadend with IPv6 support (the -6 option) but it is not enabled by default. Maybe there needs to be an "IPv4 only" checkbox in the settings.

[rsiebert]

Txh. Good to know that this is possible. A setting is probably the best, in
case some people do actually use ipv6.

2014-09-29 11:07 GMT+02:00 Nigel Hathaway notifications@github.com:

It turns out, you can start up TVHeadend with IPv6 support (the -6 option)
but it is not enabled by default. Maybe there needs to be an "IPv4 only"
checkbox in the settings.

—
Reply to this email directly or view it on GitHub
#56 (comment).

[dstolpmann]

Another option is to use something like the "Happy Eyeballs" algorithm to choose the protocol.

[rsiebert]

I looked in the code. See HTSConnection in line 62: System.setProperty("java.net.preferIPv6Addresses", "false");
I can also add this line: System.setProperty("java.net.preferIPv4Stack", "true");
But I can't test this.

[dstolpmann]

In my opinion the current code looks right.

If you set java.net.preferIPv4Stack to true, IPv6 will be completely disabled.

This is the log while trying to connect via hostname in a dual-stack environment:

E/HTSPConnection(13138): Can't read message
E/HTSPConnection(13138): java.net.ConnectException: failed to connect to HOSTNAME/IPV6-ADDRESS (port 9982): isConnected failed: ECONNREFUSED (Connection refused)
E/HTSPConnection(13138): at libcore.io.IoBridge.isConnected(IoBridge.java:223)
E/HTSPConnection(13138): at java.nio.SocketChannelImpl.finishConnect(SocketChannelImpl.java:259)
E/HTSPConnection(13138): at org.tvheadend.tvhclient.htsp.HTSConnection.processTcpSelectionKey(HTSConnection.java:279)
E/HTSPConnection(13138): at org.tvheadend.tvhclient.htsp.HTSConnection.run(HTSConnection.java:257)
E/HTSPConnection(13138): Caused by: libcore.io.ErrnoException: isConnected failed: ECONNREFUSED (Connection refused)
E/HTSPConnection(13138): at libcore.io.IoBridge.isConnected(IoBridge.java:208)
E/HTSPConnection(13138): ... 3 more
E/HTSPConnection(13138): Can't close connection
E/HTSPConnection(13138): java.nio.channels.ClosedChannelException
E/HTSPConnection(13138): at java.nio.channels.spi.AbstractSelectableChannel.register(AbstractSelectableChannel.java:130)
E/HTSPConnection(13138): at java.nio.channels.SelectableChannel.register(SelectableChannel.java:143)
E/HTSPConnection(13138): at org.tvheadend.tvhclient.htsp.HTSConnection.close(HTSConnection.java:229)
E/HTSPConnection(13138): at org.tvheadend.tvhclient.htsp.HTSConnection.run(HTSConnection.java:273)

[rsiebert]

Someone seems to have a similar problem:
http://stackoverflow.com/questions/3853286/java-application-wanting-to-use-both-inet4address-and-inet6address-at-the-same-t
I would need a patch / pull request because I don't have any IPv6 enabled devices here.

[rsiebert]

I'm closing this issue. It can be reopened when it is required or a patch has been provided.