[mythtv-users] Mythbackend not binding IPv6 ULA

[Bill Meek]

On 11/18/2014 06:31 PM, Rob Jensen wrote:
> My backend seems to be refusing to bind any unique local addresses to its
> network connection, which is causing issues with my frontends who are using
> IPv6.  Mythbackend should see an address beginning with fdxx, but it's only
> finding the global and link-local addresses.  I'm able to work around this
> on a temporary basis by specifying my global/public IPv6 address in the
> backend setup, however things get FUBAR'ed whenever my ISP updates my
> backend's IPv6 address.  Does anyone else have similar experiences or
> pointers as to where I should be looking for a fix?

FWIW, I've been using ULAs since IPv6 became available to MythTV users.
The difference is that I explicitly define the addresses in mythtv-setup
under: Local Backend/IPv6 address and Master Backend IP address:.

Right now:
If you start your backend with --loglevel debug, you'll see the message:

     Skipping address: your ULA here...

I <think> because in this:

     https://code.mythtv.org/cgit/mythtv/tree/mythtv/libs/libmythbase/serverpool.cpp#n256

there's no test for ULAs. If you look near line 26 in the same file,
there's no definition such as:

     static QPair<QHostAddress, int> kUniqueLocalAddress =
                             QHostAddress::parseSubnet("fd00::/8");

But I'm not familiar with the rules used there. Personally, it looks
like you found a bug. I also don't know if it should be fc00::/7.

My solution has always been to put my ULAs in the 2 fields mentioned
in the 1st paragraph of my response. So I've never noticed what you
found.

-- 
Bill