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Netgear Genie showing over 1900 connections
I've had this netgear CM500 modem for 2 years now. All of a suddent I've started to have issues with connectivity. I called my ISP but they said everything is fine on their end. I then tried switchin...
michaelkenward wrote:Freaky.
Perfectly correct - the Genie (desktop) program is right - all these computers are on the same subnet.
michaelkenward wrote:But the CM500 is just a modem. The network map will be down to the router. What is it?
Correct again. Lack of a NAT router, the modem does connect to the cable company headend, hand-out one Public IPv4 address (for one computer or for one router WAN/Internet port).These addresses are from your ISP (rcn.com/rcn.net) assigned IP-Network-Block 66.44.8.0 - 66.44.15.255. A cable headend is connecting a large amount of clients, so big IP subnets are nothing uncommon. /21 or /20 subnets on a single RF headend are typical, this makes 2046 available addresses on a /21 (255.255.248.0) or 4094 available addresses on a /20 (255.255.255.240.0) subnet.
michaelkenward wrote:Have you tried searching for all those IP addresses? Half the planet seems to be running on your network.
No, just some thousand customers from that very same ISP.
insainzeno nothing wrong, nothing to worry - except that you must ensure your computer firewall is configured to connect to a public network.
Freaky. But the CM500 is just a modem. The network map will be down to the router. What is it?
What do you see if you use the browser graphical user interface (GUI)?
Have you tried searching for all those IP addresses? Half the planet seems to be running on your network.
michaelkenward wrote:Freaky.
Perfectly correct - the Genie (desktop) program is right - all these computers are on the same subnet.
michaelkenward wrote:But the CM500 is just a modem. The network map will be down to the router. What is it?
Correct again. Lack of a NAT router, the modem does connect to the cable company headend, hand-out one Public IPv4 address (for one computer or for one router WAN/Internet port).These addresses are from your ISP (rcn.com/rcn.net) assigned IP-Network-Block 66.44.8.0 - 66.44.15.255. A cable headend is connecting a large amount of clients, so big IP subnets are nothing uncommon. /21 or /20 subnets on a single RF headend are typical, this makes 2046 available addresses on a /21 (255.255.248.0) or 4094 available addresses on a /20 (255.255.255.240.0) subnet.
michaelkenward wrote:Have you tried searching for all those IP addresses? Half the planet seems to be running on your network.
No, just some thousand customers from that very same ISP.
insainzeno nothing wrong, nothing to worry - except that you must ensure your computer firewall is configured to connect to a public network.
Thanks for the info. That answers a lot. Doesn't solve the issue of the spotty internet connection but that helps. It seems my modem can no longer handle intense internet traffic so I've decided to get a new one that's DOCSIS 3.1 certified. As for the firewall, I'm inexperienced when it comes to that so any recommandation is welcomed.
schumaku wrote:
michaelkenward wrote:Freaky.
Perfectly correct - the Genie (desktop) program is right - all these computers are on the same subnet.
michaelkenward wrote:But the CM500 is just a modem. The network map will be down to the router. What is it?
Correct again. Lack of a NAT router, the modem does connect to the cable company headend, hand-out one Public IPv4 address (for one computer or for one router WAN/Internet port).These addresses are from your ISP (rcn.com/rcn.net) assigned IP-Network-Block 66.44.8.0 - 66.44.15.255. A cable headend is connecting a large amount of clients, so big IP subnets are nothing uncommon. /21 or /20 subnets on a single RF headend are typical, this makes 2046 available addresses on a /21 (255.255.248.0) or 4094 available addresses on a /20 (255.255.255.240.0) subnet.
michaelkenward wrote:Have you tried searching for all those IP addresses? Half the planet seems to be running on your network.
No, just some thousand customers from that very same ISP.
insainzeno nothing wrong, nothing to worry - except that you must ensure your computer firewall is configured to connect to a public network.
insainzeno wrote:Doesn't solve the issue of the spotty internet connection but that helps.
Without any more insight, hard to help.
insainzeno wrote:It seems my modem can no longer handle intense internet traffic so I've decided to get a new one that's DOCSIS 3.1 certified.
Unless you subscribe to a 700 Mb/s or faster Gigbit service, a DOCSIS 3.0 modem is certainly enough, providing 500..600 Mb/s downstream.