On 2017-03-19 15:45, James Knott wrote:
On 03/19/2017 10:38 AM, Carlos E. R. wrote:
On 2017-03-19 03:16, James Knott wrote:
It is possible to have multiple IP addresses on one NIC, by using alias addresses. However, as you say, there's no isolation that would block something like Wireshark. Typically VLANs are used on the LAN side, not the WAN. The only time I've seen VLANs on the WAN side is when one carrier is using another carriers fibre, to deliver a connection to a customer. In that situation, it's possible to have double VLANs on the fibre. My ISP uses a configuration I don't understand yet, not documented. I get the typical 192* for home, but there is also a 10* network that it is using for the VoIp transparent phone, and I think it is external. Ie, the thing accesses 10.* hosts on the outside. And there is another vlan for the TV, I don't remember on which range.
While I have worked in many areas of the telecom industry, I have never worked on the cable TV network. However, it's common to provide multiple address ranges over the cable, without using VLANs. When I use Wireshark to see what's coming through my cable modem, I can see several different IP address blocks. I haven't seen any indication of VLANs, thought it's possible that would be blocked by the modem.
Makes sense. However, I have the suspicion that the router is using vlans for that, or that it is configured in the vlan section. You gave me an idea, perhaps I can plug to the modem (it is not called that, it has a peculiar name, what is it... ah, ONT (Optical Network Terminal)); it is fibre, not coax) and listen. -- Cheers / Saludos, Carlos E. R. (from 42.2 x86_64 "Malachite" (Minas Tirith))