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TDL shepherd
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I did turn on the MoCA on the Roamio Plus.

The mini did connect to the internet using MoCA and download the info from TiVo. When the mini tried to connect to the Roamio I received the V78 could not find host dvr error.

Note: The mini used to connect to the Roamio by MoCA several months ago. I was gone for a long period of time and unplugged the mini from from the AC. When I returned and tried to repower the mini is when all of the troubles ensued.

My provider is Comcast.
Short of a more comprehensive review of all your equipment and connections (and ideally a diagram, as mentioned by thyname), some questions...
  1. Is 'V78' the correct code? I find it strange that I'm getting zero search results for that code.
  2. What are you using for your modem and router/gateway (brands/models)?
  3. Do you have any other currently-connecting MoCA devices?
  4. Have you tried doing a factory reset (aka 'Clear & Delete Everything') of the Mini?
 

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TDL shepherd
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I am not 100% sure of the code number now as the mini connected with ethernet.
Ok; we'll put a pin in that, for now.

Modem is an Arris/Motorola SDBG 6580 and router is Buffalo Airstation N600 running dd-wrt.
Also good, as the SBG6580 doesn't support MoCA (and so can't be conflicting).

I do not have any other devices on the MoCA network.

I have done a factory reset not once, but several times. Spent over an hour with TiVo support with no luck.
Noted.

Would love to do a diagram, what is the easiest software to use?
Pencil & paper work well. Don't get hung-up on making it look pretty; accuracy is what matters... e.g. including device models, how devices are connected via both coax and Ethernet, the specs of interconnecting components (switches, splitters, amps). See attached for examples, for inspiration. ;)

.
 

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TDL shepherd
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Modem is an Arris/Motorola SDBG 6580 and router is Buffalo Airstation N600 running dd-wrt.
Your modem could be the problem. It has built in Moca, so you may have two Moca "creators" on the network.
Did I pull-up the wrong documentation....
Also good, as the SBG6580 doesn't support MoCA (and so can't be conflicting).
I'm not seeing any mention of MoCA in the documentation, nor does the device's front panel have the usual MoCA LED indicator.
 

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TDL shepherd
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17,537 Posts
If you have the ability to move the Mini, along w/ some spare coax and (hopefully) a known-good MoCA-compatible 2-way splitter, you could attempt the MoCA test in the following post, placing the Mini as close as possible to the MoCA-creating Roamio, to try to eliminate other coax component issues as the problem.

http://tivocommunity.com/tivo-vb/showthread.php?p=10980434

Given what you've done so far, it sounds like you could consider bullets 1-3 already completed, and start w/ #4.
 

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TDL shepherd
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17,537 Posts
Thanks for the diagram. Unfortunately, it doesn't clear-up the most important question...

How does the Mini's coax line connect back to the coax line connecting to your MoCA-creating Roamio Pro?

See attached:
Font Rectangle Parallel Diagram Plan

Though I'm wondering if the name of your diagram, 'Apartment Network.jpg,' doesn't hint at the underlying issue... that you live in a "multi-dwelling" building, and so your rooms may not be isolated from the rest of the apartment building/complex. For reference, you may want to take a look at this PDF from Cisco...
... specifically, pages 17 & 18 that discuss multi-dwelling buildings. See attached:
Rectangle Font Slope Parallel Number

The "solution" on page 18 demonstrates how an apartment/condo *should* be wired, assuming a MoCA-compatible splitter is used, while page 17 may depict how it currently *is* wired -- noting that the splitter in the page 17 diagram may also be a MoCA-hostile splitter or amplifier, further complicating connectivity.
 

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TDL shepherd
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I did turn on the MoCA on the Roamio Plus.

The mini did connect to the internet using MoCA and download the info from TiVo.

When the mini tried to connect to the Roamio I received the V78 could not find host dvr error.
These 3 points, in combination with my speculation re: a multi-dwelling building, make me wonder if your Mini might have been connecting to/through a neighbor's MoCA network.

Running with the multi-dwelling speculation:
  • Yes, your Mini may be in another room in your apartment, but it doesn't know that, inherently. The Mini may be seeing a stronger MoCA signal coming from another device hanging off a shared splitter/amplifier.
  • Connecting via another MoCA bridge would explain why the Mini can connect to the Internet, but not see or connect to your DVR.
  • This also might explain why MoCA on the Mini used to work but doesn't now -- even if no hardware has changed -- if someone fired-up MoCA where it didn't used to be.

Things you might do to test the theory...
  1. Compare IP Settings

    With the Mini connected via MoCA, check its network settings information ("View network status") to determine its:
    • IP address
    • subnet mask
    • gateway IP address
    • etc.

    You can then compare these values to what your DVR and other functioning network gear report. All your gear should have the same gateway address, and would typically have the same first three integers making-up their individual IP addresses.
  2. Test for alternate MoCA bridge

    Power-off the Roamio (supposedly your one MoCA bridge) and then power-cycle your Mini, and see if the Mini is still able to connect to the Internet via MoCA.

    With your lone MoCA bridge fully powered-down, the basic MoCA connection for the Mini should fail.

p.s. Addendum to the above tests: If your Mini is connecting via your own network, you should be able to check your router to determine whether the Mini is connecting by looking at the list of connected clients. (This would certainly apply if the Mini is configured for DHCP, and possibly even if the Mini is using a manually-configured static IP.)
 

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TDL shepherd
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17,537 Posts
He subsequently said he does not have MoCA enabled on Roamio. See post #13
Then he's well on his way to completing test #2, though I'd prefer the Roamio be fully powered-down, in order to eliminate any possible TiVo network configuration hinkiness that's been observed in the past.

With the Roamio powered-down, the Mini shouldn't be able to connect via MoCA. (I believe it's currently networked via the Ethernet/Powerline connection.)
 

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TDL shepherd
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17,537 Posts
Motorola cable box is very old and does not have a DVR or even HDMI, only uses component video so I would guess that it can not create a MoCA network.
Agreed; almost certainly not.

Though feel free to power-off this device, as well, when trying test #2, "Searching for a mystery MoCA bridge." As Hicks would say, only way to be sure.

I have not looked at the wiring in the main box outside my apartment, but I will later today.
Look forward to hearing/seeing what you find. Take a pic w/ a smartphone, if needed, and/or jot down any model numbers you see for each component in the box.

p.s. I'd also be interested in a pic of the splitter connected to the Roamio, or its brand/model#. (Just to verify its specs.)
 

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TDL shepherd
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17,537 Posts
It is as you suggested, the mini is connecting to the internet and TiVo through another MoCA network. It got a strange ip address, but because everyone in my complex uses Comcast, the DNS was correct.

Is there anyway I can force the Mini to connect to my network? If not, will attaching a POE filter at the box solve my problem?

Thanks,
Excellent. And, yes, there is -- I believe -- and apologies for not posting it sooner. (Thought of it over an hour ago, but it slipped my mind when I got back to the keyboard to post the above 2 tests.)

First, one other thing I just thought of that also would have been useful in identifying your MoCA connection to a foreign entity... check your MoCA connection stats on your Mini. Via the MoCA stats you can see the other MoCA nodes visible, their transmission and power levels, as well as their MAC addresses. See:
edit: NOTE: You should take note of the MoCA channel being used by the Mini when it is connected to the foreign MoCA network --- and avoid/skip using that channel number when manually configuring your Roamio & Mini.​

As for trying to establish your MoCA network as-is, without making any of the desired/necessary changes to your network to bring it up to MoCA snuff, you could try...

Manual configuration of your MoCA Settings

  1. When configuring the Roamio Pro with "Use this DVR to create a MoCA network," manually configure your MoCA network settings in the Roamio Pro, setting an explicit MoCA channel and enabling privacy -- starting with the lowest MoCA channel possible;
  2. Configure the Mini to "Connect using MoCA" using the matching settings entered into the Roamio, and see if you have any luck;
  3. Repeat both of the above for successive increments of the MoCA channel number, until you successfully connect. (hopefully?!?)

NOTES:
  • Adjusting the channels may find an open space available;
  • Using privacy ensures that only your MoCA devices can connect;
  • WARNING: Increasing the MoCA channel from 15 upward reduces the odds of MoCA connectivity if using sub-compliant splitters, amps, etc., as the higher channels move further and further away from the specs for a common cable coax splitter.
 

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TDL shepherd
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17,537 Posts
p.s. NOTE: You should take note of the MoCA channel being used by the Mini when it is connected to the foreign MoCA network --- and avoid/skip using that channel number when manually configuring your Roamio & Mini.
 

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TDL shepherd
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17,537 Posts
Is there anyway I can force the Mini to connect to my network? If not, will attaching a POE filter at the box solve my problem?
You'll want to review the multi-dwelling portion of my earlier post, here.

You *will* want/need a PoE MoCA filter installed, but properly installing a MoCA filter may not be possible if all your cable lines don't route to a single, isolated splitter dedicated to your apartment. Again, see the above multi-dwelling info, and post back if you have questions.
 

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TDL shepherd
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17,537 Posts
First, one other thing I just thought of that also would have been useful in identifying your MoCA connection to a foreign entity... check your MoCA connection stats on your Mini. Via the MoCA stats you can see the other MoCA nodes visible, their transmission and power levels, as well as their MAC addresses. See:
I'd be interested in hearing/seeing what MAC addresses are reported for the MoCA nodes when viewing your TiVo Mini's MoCA stats. I'd also be interested in seeing the MAC addresses for your Arris SBG6580's WAN & LAN ports (and wireless LAN, if easily found).

Just want to make sure that thing isn't doing MoCA. (mdavej has made me paranoid.)
 

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TDL shepherd
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17,537 Posts
[*]WARNING: Increasing MoCA channels reduces the odds of MoCA connectivity if using sub-compliant splitters, amps, etc., as the higher channels move further and further away from the specs for a common cable coax splitter.
For example... Note that upgrading their splitter to a MoCA-compatible model and getting a PoE MoCA filter in place has apparently just-now resolved the other TCFer's MoCA connection problem for their Mini.

http://tivocommunity.com/tivo-vb/showthread.php?p=10983020
 
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