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Cable network
It's Internet over DOCSIS (TV cable).
Modems
There are several modems you can use for DOCSIS, some of them mentioned here.
- Technicolor TC4400 – DOCSIS 3.1
Puma bug
The Intel Puma 5/6/7 chipsets are vulnerable to the so-called "Puma bug". Do not buy these.
Further information:
- Intel Pumageddon: Broadband chip bug haunts Chipzilla's past, present and future (The Register, 2017)
Cable Haunt
The cable haunt vulnerability (CVE-2019-19494 is an exploit where an attacker sends malicious packets to your modem which can change settings.
Further information:
- Mitigate the vulnerability with OPNsense (Homenetworkguy, 2/2020)
- Cable Haunt: Schwachstelle macht Millionen Router angreifbar 🇩🇪 (Computerbase, 2020)
Mitigation
- Technicolor TC4400: Block
192.168.100.1:8080/tcp
from LAN. You may want to put the TC4400 in its own VLAN.