Just for reference, I am Spectrum SoCal (Marina Del Rey, 90292), which is Digital Hollywood/Westchester. The tuning adapter is a Motorola MTR-700 and the cablecard is also a Motorola cablecard.
I have a Ceton Ethernet with 6 tuners, and it works perfectly. So for your reference I will post pictures of my situation.
Most importantly, it is on my LAN with a DHCP-assigned IP address of 192.168.1.10 (gateway router is 192.168.1.1). But the Ceton Ethernet is a static IP address of 192.168.200.1. This is the same static IP address used by the internal Ceton PCIe 4-tuner/6-tuner cards. Each of the six tuners is accessed via 192.168.200.2, ports 8000, 8001, 8002, ..., 8005. I have two HTPC's, one with an internal Ceton 6-tuner PCI-e card and the other with this Ceton Ethernet 6-tuner box (which used to instead have an internal PCIe 6-runer card), and before that I was using 4-tuner original cards.
I have never seen any Ceton tuner with a static IP address of anything other than 192.168.200.1, and this was automatically configured by the driver and software install, not by me. So I cannot understand how a static IP address of 192.168.100.101 can get configured. Intuitively I have a suspicion this has something to do with the "waiting for channel map" symptom, and inability to load it properly.
Also, note the firmware on my Ceton Ethernet: ceton_infinitv_beta_fw_14_10_3_163.IMAGE. I believe this is current for the Ethernet tuner box.
In contrast, the firmware on my Ceton PCIe 6-tuner card is: ceton_infinitv_beta_fw_15_1_13_152.IMAGE which I believe is current for the PCIe tuner card.
I don't believe you can use the PCIe tuner firmware on the ethernet box, but don't hold me to it. Nevertheless, I simply report my own status... which works fine on both HTPC's, one using internal PCIe card and the other using ethernet tuner.
So, here are my pictures.
(1) Web - system
(2) Web - network settings
(3) Web - tuning adapter