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Forum Discussion
cable modem uses it's public IP on LAN
My C7000 cable modem sometimes uses it's public IP and MAC address on the LAN. Internet: 98.xxx.xxx.95, a0:04:60:x:xx:c9 LAN: 172.16.0.1, 255.255.255.255, a0:04:60:xx:xx:ca 11:54:29.355222 ...
Thats just the logs reporting NAT operations.
The public IP is not being used on the LAN side of the fence.
Sorry, I should have specified the logs I posted were from an Ethernet device on my local network. The logs were not from the Netgear.
So I see frames with the Netgear cable modem WAN IP and MAC appearing on my LAN wires. Maybe Xfinity messed something up.
I factory reset the modem, but am still seeing the frames. If only I could SSH into the Netgear I might be able to figure something out. My devices are ignoring the ARPs since the requester is not on their subnet.
11:50:36.593959 In a0:04:60:xx.:xx:c9 > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), length 60: arp who-has 192.168.0.200 tell 98.xxx.xxx.95
You can contact the ISP and NG support to see if there is any information regarding this. Again, this maybe the handling of NAT operations...