[mythtv-users] Mythbackend not binding IPv6 ULA

[Hika van den Hoven]

Hoi Bill,

Tuesday, November 25, 2014, 5:08:44 PM, you wrote:

> On 11/25/2014 06:23 AM, Jean-Yves Avenard wrote:
>> On 20 November 2014 at 01:28, Rob Jensen <bertaboy at gmail.com> wrote:
>>
>>> I didn't even think to explicitly define the IPv6 address in the Master
>>> Backend IP address field.  Once I changed that from the hostname to the
>>> specific ULA, everything began working again.  I'll submit a bug ticket,
>>> hopefully the fix is relatively easy.
>>
>> there's no bug here.
>>
>> You need to define the IP address the backend is going to listen on.
>> It's per design
>>
>> Only link-local and local addresses are listened on automatically.

> I think the reason for confusion (at least mine), is that
> ULAs are similar to IPv4 Private Network addresses which
> are automatically listened to.

> Although global, ULAs are never to be routed to the Internet.
> https://tools.ietf.org/html/rfc4193 .

> I'll submit a ticket if it has a chance if being accepted. Otherwise
> there's no sense spending developer time reviewing and closing it.

> diff --git a/mythtv/libs/libmythbase/serverpool.cpp
> b/mythtv/libs/libmythbase/serverpool.cpp
> index da0d5fb..8a4a0ee 100644
> --- a/mythtv/libs/libmythbase/serverpool.cpp
> +++ b/mythtv/libs/libmythbase/serverpool.cpp
> @@ -25,6 +25,8 @@ static QPair<QHostAddress, int> kLinkLocal  =
>   #if !defined(QT_NO_IPV6)
>   static QPair<QHostAddress, int> kLinkLocal6 =
>                               QHostAddress::parseSubnet("fe80::/10");
> +static QPair<QHostAddress, int> kUniqueLocalAddress =
> +                            QHostAddress::parseSubnet("fd00::/8");
>   #endif

>   class PrivUdpSocket : public QUdpSocket
> @@ -227,6 +229,15 @@ void ServerPool::SelectDefaultListen(bool force)
>                           v6IsSet = true;
>                   }

> +                else if (ip.isInSubnet(kUniqueLocalAddress))
> +                {
> +                    // always listen on Unique Local Addresses
> +                    LOG(VB_GENERAL, LOG_DEBUG,
> +                            QString("Adding ULA '%1' to address list.")
> +                                .arg(ip.toString()));
> +                    naList_6.append(*qnai);
> +                }
> +
>                   else if (ip.isInSubnet(kLinkLocal6) && allowLinkLocal)
>                   {
>                       // optionally listen on linklocal

I think the issue here is more simple. He at first had put his
hostname in and got his public ip-address. I guess he has no local dns
and the address was provided by his providers dns, who off cause could
not have any knowledge of his local addresses.

Tot mails,
  Hika                            mailto:hikavdh at gmail.com

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