[mythtv-users] HDHomeRun, 2nd NIC and dhcpd bootup issue
harley at thepetersclan.net
Mon Nov 5 16:45:44 UTC 2007
> I'm a long time user of MythTV and very much appreciate all the hard work everyone puts into the software. I recently decided I wanted a second HD tuner for OTA broadcasts and since I am already using 4 of 5 PCI slots, I decided to try a HDHomeRun.
> While setting it up, I determined that the HDHomeRun used DHCP to get an IP address so I first connected it to my home network so my router would provide the IP address. My MythTV server is connected to my home network via a PCI Gigabit Ethernet card (eth0). Once everything was up and running, I wanted to move the HDHomeRun off my home network. I enabled the motherboard's 10/100 Ethernet NIC (eth1) and configured dhcpd to provide an address to it. After directly connecting the HDHomeRun to eth1 and restarting mythbackend, the tuners were available and working without any other changes.
> Everything was great until my system was rebooted.
> Turns out that after the reboot mythbackend reported "device not found" for both HDHomeRun tuners. After manually restarting mythbackend, the tuners were back and working. Thinking that the problem might be related to the second NIC and DHCP, I reconnected the HDHomeRun to my home network, rebooted and found that indeed, the tuners were discovered after the server restart.
> When facing an issue such as this, I figure I'm not the first to experience it and search the internet for a solution. This time, I couldn't find a solution.
> Thinking that it might be a timing issue where the HDHomeRun did not yet have an address from my MythTV dhcpd server for the second NIC, I hunted in the code until I found the FindDevice function in libs/libmythtv/hdhrchannel.cpp. I noticed that it tries to "Discover" the HDHomeRun 6 times before reporting "device not found". I modified it to try 60 times to give the HDHomeRun a bit more time to get an IP address. After building and installing the change, I rebooted and found that the HDHomeRun was found by mythbackend after the server restart and my problem was solved.
> I don't know if the problem is unique to my configuration but, if not, perhaps my experience will help someone else.
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Well i gave it a try but i have to set it to 200+ to get it to work.
So i just installed a second switch instead.
The real problem is when you reboot the backend the network interface on
the Hdhomerun goes down. And when it comes back up it tries to get an ip
address from the dhcp server right away and the server hasn't booted up
yet so the dhcp server isn't yet available.
By putting the switch in the Hdhomerun network interface never goes down
when rebooting the backend and therefore doesn't attempt to get an ip
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