So I have four ReplayTV units here at home, all cabled into one switch (mostly). For a year or so, I had another PC in the one of the spare bedrooms; setting it up, I bought a little switch to expand the network there. Then the oldest son moved back in, and loaded that PC up with spyware and malware and porn. Out goes the PC (if he wants porn, he can get himself an apartment and pay for his own internet connection).
Since the only network device in his room was the Replay, I pulled the little switch out as well, and cabled that Replay directly into the same switch as the rest. See the top of the diagram of the network.
Except his Replay fell off the network.
Hunting it down, it was a DHCP problem, kind of.
BTW, I learned that the Linux equivalent of TeraTerm Pro is minicom. It was silly how difficult it was to find out what program to use to access the first com: port on my PC (which is cabled directly into the Cisco router). There are a thousand pages telling you how to access the Linux console via a serial port connection, but hardly any that tell you how to access the console port of some other device from Linux. But I digress.
The nice thing about being cabled directly into the router is that I could turn on the debug messages for the DHCP server and do DHCP release and renews and watch the messages scroll by.
Next test: reboot the errant ReplayTV.
The DHCP server would continuously get DHCP discover packets, and hand back DHCP inform packets, but the Replay never took Yes for an answer.
Sometimes, the DHCP server even managed to send back unicast packets (which is what it would do for the properly working devices). Still, no go. The Replay would not take an IP address. Even if I configured it manually, it complained it couldn't talk to the default gateway.
Eventually, I carry the Replay into the computer room, and hook it directly to the switch, bypassing the in-wall wiring. No joy. A thought struck me: how about bypassing the big switch (the D-Link), and plugging directly into the Cisco?
It works!
Put it back on the D-Link. Despair.
Well... it worked for a year, when there was the little Netgear between it and the D-Link....
It works. (See the bottom of the diagram).
I don't get it. Three out of four Replays are happy with the D-Link. This one - picky picky picky.
So there you have it: the debugging process to get a wonky net appliance back on the network. The Replays run VxWorks which keeps me, a mere mortal, from being able to tell what is going on inside the device.
I can kind of see the appeal of something like MythTV. If only the ReplayTV people would sell their guide service to MythTV users....
On the other hand, the devices Just Work (err...), and have for years. My wife thought I was the world's most intelligent husband the week after I brought the first box home. And then, when I brought the second box home and they auto-networked and streamed video between them.... :-)
Heh. I really like my Replays.
Even if I do have to play network tech every couple of years.