[mythtv-users] Strange Issue with Myth and HDHomeRun

[Stroller]

On 13 Feb 2007, at 01:29, John Welch wrote:
> ...  For my network setup I am using IPCop as a firewall, and have  
> the Myth B/E system and the HDHR in my DMZ network (orange network  
> in IPCop terms).  The F/E system is on my internal (green)  
> network.  This network setup has never caused me any issues with  
> MythTV or anything else.
>
> Now on to the problem.  I can record content from the HDHR as long  
> as I don't do anything with Myth on my F/E system while the  
> recording is taking place.  However, as soon as I bring up MythTV  
> on my F/E the HDHR recording becomes "corrupt", for a lack of a  
> better term.  By corrupt I mean there are severe video and audio  
> breakups and dropouts to the point where the recording is  
> unwatchable.  This is not just a playback issue; the corruption is  
> actually in the file.  For testing purposes I have run some of the  
> F/E functions on the B/E system and this does not cause the  
> corruption to occur.  This is leading me to believe that there is  
> some type of network issue, but I can't figure out what the problem  
> is and why it is happening. ...
>
> My next troubleshooting step is to try to setup a test Myth box in  
> my internal network, and to also temporarily move the HDHR to the  
> internal network.  Even if this proves to be the solution I'd like  
> to understand why my current live setup is not working.

As I understand it the HDHR boxes stream the video over ethernet, so  
"the corruption is actually in the file" indicates that the issue is  
with the ethernet load between the HDHR & the BE. (but only when the  
FE is used?)

I'm not _entirely_ clear why you have the Myth B/E system and the  
HDHR in a DMZ, but that may simply be because I'm not familiar with  
IPcop.
Do you have separate network cards in the firewall-router for the  
green & orange zones?
Are the Myth BE and the HDHR sharing a switch together?
Because my instinct would suggest that there might be a routing  
problem and the issue is with the router's inability to move packets  
fast enough. Admittedly this does not entirely make sense if my  
assumptions about your network topography are correct.

I have to admit that I'm not familiar with `netstat`, either, but my  
instinct would have been to move the the HDHR & the BE to the same  
network as the FE in the first place. It's not hard to do this (or  
shouldn't be, depending upon your configuration) and it would  
eliminate the firewall completely. The ethernet cables for the three  
machines should go into a 100mBit or faster network switch. Yes?

Just to ensure that my brain's not playing tricks on me here, could  
you clarify a little more about your network, please? A link to your  
previous postings on SiliconDust might be sufficient, but I'm  
thinking that ip address & subnet mask for each interface on each  
machine (FE, BE & HDHR) should clarify, maybe with a description of  
the physical Ethernet connections, too.

Thanks,

Stroller.