Member Avatar for GiddyupGilbert

I would like as many opinions as I can get on this subject. I am trying to figure what system problems will result in a 192 IP address, and the fix for that problem. I will start with, unscrew the coax and that will result in a 192. Your thoughts greatly appreciated.
Giddyup

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Posts from , and hit the common possibilities, and ’s “unscrew the coax” test is a useful starting point. Below is a compact diagnostic checklist and practical fixes to determine why a Windows machine shows a 192.* address when connected directly to a cable modem.

  1. Gather facts (quick). From a Command Prompt run:

    ipconfig /all

    Note the IPv4 address, Subnet Mask, Default Gateway and DHCP Server. Only addresses in 192.168.0.0/16 (RFC1918) are private; other 192. values may be public. A 169.254. address means APIPA (no DHCP lease).

  2. Basic network tests.

    ipconfig /release
ipconfig /renew
ping <default gateway>
tracert 8.8.8.8

    If the default gateway is another 192.168. address, a NAT device (router or modem/router) is present. If ping to gateway fails but the adapter still has 192., check for a static IP or a virtual adapter (VMware, VirtualBox, VPN) that can create local 192 addresses.

  3. Common causes and remedies.

  • Static IP on the NIC: set IPv4 to obtain address automatically (TCP/IP properties) or remove the static entry.
  • ISP gateway/modem running router mode: many ISP boxes perform NAT and hand out 192.168 addresses; login to the gateway at the default gateway address or call the ISP to request bridge mode if a public IP is required.
  • Carrier NAT (CGNAT): ISP may be assigning a private address upstream — only the ISP can change this.
  • Modem/lease issues when switching devices: always power-cycle the modem when moving the modem connection between different NIC MAC addresses so it forgets the previous lease.

Check for multiple adapters in ipconfig /all (virtual adapters often show their own 192. addresses) and disable them temporarily. Running the checklist above will show whether the 192. is a local router lease, a leftover static/virtual address, or an ISP-side NAT issue, and that determines the next step (reconfigure the NIC, power-cycle/reset the modem, or contact the ISP).

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Member Avatar for HoustonIT

Are you sure you don't mean a 169.254.x.x address? Usually a 192 address means everything is working.

Member Avatar for bobbyraw

a 192 is a publis IP address and dependind on you ISP you can get one even if you are directley connected modem to PC. Although most time a 192 IP suggest you have a personal router. but a 192 ip is a good valid working IP

Member Avatar for GiddyupGilbert

Are you sure you don't mean a 169.254.x.x address? Usually a 192 address means everything is working.

You're absolutely correct if a router is in place. To get a 192 without a router means something's not connected, either physically or Network Connection-wise.
Giddyup

Member Avatar for GiddyupGilbert

a 192 is a publis IP address and dependind on you ISP you can get one even if you are directley connected modem to PC. Although most time a 192 IP suggest you have a personal router. but a 192 ip is a good valid working IP

Bobby,
I may be incorrect on this. There's always more than one answer to a problem. My ISP dishes out DHCP dynamic IPs, 68.,69.,71.,75.76. and even 98. The 192 is an internal IP dished out by the router. If you disco the coax your computer will automatically give you a 192; hook it back up and you'll get your 69 or whatever. My experience has been when the coax gets screwed up visavi swapping back and forth two computers on one modem the confused coax will dish out a 169. And there can also be a problem physically with the modem. Sometimes, but not always, when you get a 192, it can be broken the same way you clear a 169, but this is not always the case. I know there are other reasons and I'm trying to find out what I'm missing. Thanks for the reply BTW.
Giddyup

Member Avatar for audiqv8

192 indicates that this is a class C network and is used mainly in private home router. If your ISP is handling out an IP address starting at 68, then this is a class A network.

IP's starting with 192 is considered a non routing IP address.

Member Avatar for GiddyupGilbert

192 indicates that this is a class C network and is used mainly in private home router. If your ISP is handling out an IP address starting at 68, then this is a class A network.

IP's starting with 192 is considered a non routing IP address.

Right on, thank you
Giddyup

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