I am pretty sure the hdhomerun usually needs a dhcp server to get an ip address.  there may be some default ip address.  I don't see that my hdhomeruns have a way to set an ip address.

If there is a default ip address then both the adapter and the hdhome run need to be in the same subnet, and network manager appears to be doing an generally useless autoconfig ip address and if the hdhome run does not use an ip address in the same subnet (or use autoconfig ip address) and/or requires dhcp then it won't have an ip address in the right subnet and/or you won't know what its ip address is.  If you are expecting autoconfig to be used then you need to figure out what ip address on the other end is.

nmap -sn 169.254.20.0/24  will scan the subnet.

tcpdump -i eno1 will show you what traffic is seen.  This is a direct cable to the hdhomerun?

On Sat, Mar 19, 2022 at 6:37 PM Geoffrey Leach <geoffleach.gl@gmail.com> wrote:
There is only one computer involved
HDHomerun is a box that converts OTA TV channels (i.e., a tuner) to a feed that is accessed by the local system.

What is working? the code that accesses the ethernet feed, as far as I can tell

What isn't working?  The connection between the local computer and the box that is supposed to receive and convert the OTA signal.

% nmcli connection show
NAME       UUID                                  TYPE      DEVICE
NETGEAR78  a0ff17c5-90a4-4d27-99eb-21c0f59dd954  wifi      wlp0s26u1u5
HDHomeRun  d1e4d6c6-b6e1-32e9-ad5c-b005b7546f4c  ethernet  eno1
% nmcli connection reload
% nmcli connection up eno1
% ifconfig eno1
eno1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 169.254.20.5  netmask 255.255.255.0  broadcast 169.254.20.255
        inet6 fe80::ae29:5a0c:d1c4:5032  prefixlen 64  scopeid 0x20<link>
        ether e8:40:f2:05:de:1c  txqueuelen 1000  (Ethernet)
        RX packets 63  bytes 21234 (20.7 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 30  bytes 3666 (3.5 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 20  memory 0xf7d00000-f7d20000
Community support for Fedora users <users@lists.fedoraproject.org>On 3/19/22 16:18, Geoffrey Leach wrote:
> F35, fresh install. I have an ethernet-connected device (HDHomerun,
> fwiw) newly re-compiled on the newly-installed F35 xfce4 workstation. As
> far as I can tell from trying every network analysis I can find, the
> connection is good (exception, no response to ping) The interface was
> configured with the NetworkManager app,  that assigned the device eno1.
>
> I'm sure that somewhere in all of the data that I collected, the problem
> sticks out like the proverbial sore thumb, but not to me, alas.  

You need to provide more details.  I don't understand what you're trying
to do and what isn't working.  As far as I can tell, "HDHomerun" is some
sort of software.

How many computers are involved?
What is working?
What isn't working?
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