Someone in my neighborhood has misconfigured a modem, that hands out DHCP address
we had a power failure this morning, and I keep getting IP addresses from this modem, and I cannot access the internet.
it is a Netgear device
how can I get around this issue, I do not know who in the neighborhood has the device.
I'd go with static IP that goes with your own network range, with DNS and default gateway configured.
It would take at least 2 receiving stations with the ability to measure signal strength to triangulate where the bad modem happens to be.
Do you have your own cable modem, or do you share? It would be really weird for you to get leases from a neighbor unless there is a bridge between the networks besides the cable modem.
-Otanx
Quote from: Otanx on June 09, 2021, 04:39:36 PM
Do you have your own cable modem, or do you share? It would be really weird for you to get leases from a neighbor unless there is a bridge between the networks besides the cable modem.
-Otanx
Or if the neighbor really cranked up the gain on his wireless side.
Quote from: deanwebb on June 10, 2021, 11:17:11 AM
Or if the neighbor really cranked up the gain on his wireless side.
That would be a different SSID, and shouldn't cause issues unless you joined that network. If this is a shared SSID then like Dean said good luck triangulating the signal. The easier way would be to setup a system to keep requesting IPs with different MACs from their DHCP server untill you exhaust the configured pool.
-Otanx
Quote from: Otanx on June 10, 2021, 11:23:32 AM
Quote from: deanwebb on June 10, 2021, 11:17:11 AM
Or if the neighbor really cranked up the gain on his wireless side.
That would be a different SSID, and shouldn't cause issues unless you joined that network. If this is a shared SSID then like Dean said good luck triangulating the signal. The easier way would be to setup a system to keep requesting IPs with different MACs from their DHCP server untill you exhaust the configured pool.
-Otanx
Such tools do exist, and you don't even have to speak Russian to use them!
my firewall is wired to the network. my firewall is connected to modem is picking up IP address. modem is connected to cable. cable is a shared medium, no wireless.
I was also thinking like Otanx said but my post was not sent yesterday for some reason.
But also I am thinking along these lines: Cable = DOCSIS (COAX) at your premises? Like: COAX from the street -> DOCSIS modem -> your firewall. Can you check if the docsis modem is netgear?
Quote from: Dieselboy on June 10, 2021, 09:57:15 PM
I was also thinking like Otanx said but my post was not sent yesterday for some reason.
But also I am thinking along these lines: Cable = DOCSIS (COAX) at your premises? Like: COAX from the street -> DOCSIS modem -> your firewall. Can you check if the docsis modem is netgear?
my modem is netgear, and the offending device is also netgear
Mine ( i pulled this from my modem GUI)
8C:3B:AD:DB:7D:28
offender
outside 192.168.100.1 2c30.33de.ad02
I guess that doesn't really prove anything, since the DOCSIS Modem does not have IP, probably a wireless Netgear device on other side of remote modem handing out IP. I can't really tell what DOCSIS Modem is on offender side.
I think the offending device is your local docsis modem. Does it have a sticker on it that you can confirm the case? Like a name of manufacturer or mac address?
Quote from: Dieselboy on June 13, 2021, 11:09:44 PM
I think the offending device is your local docsis modem. Does it have a sticker on it that you can confirm the case? Like a name of manufacturer or mac address?
NETGEAR CM1000
the modem is a pass throuhg device, there is not IP assigned
mac provided was not my modem, it was my AP.
See private area for packet capture to protect my IP