[mythtv-users] Sudden issue with HDHomeRun on network switch?

[Greg Oliver]

On Thu, Mar 14, 2019 at 6:47 PM Tom Dexter <digitalaudiorock at gmail.com>
wrote:

> On 3/14/19, Hika van den Hoven <hikavdh at gmail.com> wrote:
> > Hoi Tom,
> >
> > Thursday, March 14, 2019, 11:18:24 PM, you wrote:
> >
> >> I had a REALLY odd one this week, and I'm not sure what this is all
> >> about:
> >
> >> I have two HDHomeRun Connect HDHR4-2US units. They've both been
> >> connected to an 8 port switch I have for a long time. I expressly had
> >> them on the switch so as to avoid having them dependent on the router.
> >
> >> On Monday I had several recordings fail. At that point I noticed that
> >> the back of one HDHR was flashing red (no network connection). When I
> >> tried to power it off and on it would get a link for a few seconds and
> >> then drop it, and go to the blinking red status. I verified that the
> >> switch port and cable were OK by connecting other devices and they all
> >> worked OK. At that point I naturally figured that the HDHR, or the NIC
> >> in it, must have died, so I ordered another. I actually ordered two
> >> because 6th Ave Electronics (via Newegg) had them for $58 and free
> >> shipping which is way cheaper than I generally see them.
> >
> >> They arrived today and when I hooked one up...SAME issue...drops the
> >> link and flashes red after a few seconds...almost went ballistic. What
> >> I found was that both the new one and the old one I thought was dead,
> >> work perfectly connected to my router, but fail connected to ANY port
> >> on the switch.
> >
> >> To make this even stranger, I now have a laptop of mine connected to
> >> one of the same ports on that switch and it's working flawlessly. In
> >> fact, my other (older) HDHR is working connected to the switch as it
> >> always has.
> >
> >> I have no idea what to make of that at all. I can only think that
> >> maybe the switch is going bad(?) and the requirements of the HDHR to
> >> maintain a link are more restrictive than other devices?? Sort of
> >> crazy. Any opinions would be welcome.
> >
> >> Tom
> >> _______________________________________________
> >
> > How/where does the homerun obtain its ip-address?
> > Did the laptop you tested with maybe have a hard ip-address?
> > In other words check your dhcp.
> >
> >
> > Tot mails,
> >   Hika                            mailto:hikavdh at gmail.com
> >
>
> The HDHR (at least this model) doesn't support static IPs. I'm setting
> it based on MAC address with my router's DHCP server (a Linksys
> WRT1900ACS running dd-wrt). Note that it was totally dropping the link
> itself, which doesn't sound like a DHCP issue. When it keeps the link
> it gets it's IP with no problem.
>
> Thanks!
> Tom


3rd party firmware is a good thing..  With dd-wrt, you can do a tcpdump on
the wired interface..

tcpdump -i <interface name> -nn -A -XX port 67 or port 68

This will dump your DHCP packets on that interface to the screen.  Reboot
the HDHR while that is running and post the output (if any).

I cannot remember if dd-wrt (long time since I ran it) has tcpdump
installed by default, but you can definitely install it using Entware or
whatever they call it nowadays..
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