[mythtv-users] IGMP snooping

[Mark Perkins]

> -----Original Message-----
> From: mythtv-users [mailto:mythtv-users-bounces at mythtv.org] On Behalf
> Of Gary Buhrmaster
> Sent: Sunday, 5 February 2017 9:16 PM
> To: Discussion about MythTV <mythtv-users at mythtv.org>
> Subject: Re: [mythtv-users] IGMP snooping
> 
> On Sun, Feb 5, 2017 at 9:44 AM, Mark Perkins <perkins1724 at hotmail.com>
> wrote:
> ....
> > I am guessing that the "something" is the IGMP snooping timing out
> 
> You likely need an igmp querier on the network to refresh the igmp
> memberships.  Multicast routers can do this, and the better managed
> switches can be configured to perform the function.  Some "smart" switches
> can do it, although some are not quite smart enough (they depend on other
> devices such as your router to do so).  There are a couple of igmp query
> daemons floating around the 'tubes that you can run (written in perl, python,
> c, probably others) if you do not have the functionality in your
> routers/switches.
> _______________________________________________
Thanks Gary, you got me in the right direction. Using tcpdump I found that my router was indeed sending out the IGMP queries but my BE was not responding. Further searching eventually identified that firewalld was blocking the messages. I corrected the firewalld configuration using:
# firewall-cmd --permanent --direct --add-rule ipv4 filter INPUT 0 -p igmp -j ACCEPT
# firewall-cmd --reload

And seem to have alleviated the problem.

Thanks greatly for the pointer.