Can't figure this out, makes no sense...

Discussion in 'Networking Issues' started by TranceKuja, Jul 12, 2006.

  1. TranceKuja

    TranceKuja Network Guru Member

    Hello. I recently changed my setup a bit, but I've run into a big problem. My PC that is directly connected to the cable modem won't access the internet. It says there is a network plug unplugged on the bottom, but that is impossible. Not only are all the plugs in, but the second PC is working fine! That's the one I'm on now. How could this one be working, but yet the main one isn't? What could be the problem?
  2. anectine17

    anectine17 Network Guru Member

    If one PC is hooked directly to the modem, how do you have the other one (the one you're currently using) connected? If it's connected to a router, where is the router connected? If your modem has multiple LAN ports, I'd guess you've got some DHCP / IP address conflicts by having it connected the way you do. Why not run all PC's through the router? Also, make sure you don't have a bad cable. Physically change the one in question out with another and see if that makes a difference.
  3. TranceKuja

    TranceKuja Network Guru Member

    Well, here is the full story. I had a main PC with the cable modem and router, then we eventually put in a second one (the one I'm on now). Eventaully though, the main PC broke down. We couldn't really get a new one, so we unhooked it and left everything as is. This PC always worked so things were ok. I recently got a new PC from a family member which they had been using on a wireless network. So I attempted to put that PC where the main one was, directly connected to the cable modem as the main PC. But it will not connect to the internet, despite this one having no problems connecting. I thought it might be a bad wire too, since the only error message I was receiving was that there is a network cable unplugged. So I went out this morning and bought a new wire, but it still says the same thing and I can't connect. Also, I tried to renew the IP address on the PC, but it said it couldn't be renewed. Does any of this make sense? I'm sorry if I didn't explain things well enough. I just hope that someone can see what the problem is, because I'm really stumped. Please, if you can give me any bit of help it would be much much appreciated.
  4. sufrano63

    sufrano63 Network Guru Member

    Sounds to me like you're connecting a PC with a pre-configured wireless settings and connecting to a modem/router and expecting it to work. The wireless PC is trying to connecting to an AP, which is no longer exist. Try checking all your network settings and verify that it is the same as the broken "main PC"
  5. Toxic

    Toxic Administrator Staff Member

    turn the power off from the cablemodem. it needs too reissue the IP address because your now using a different LAN connection. Your MAC Address from one PC or Router is totally different.

    power up the CM again with the correct PC connected and you'll get access.
  6. Esquire

    Esquire Mesquire Staff Member Member

    A general alternative is to clone the old adapter's MAC Address to the new one using MAC Address Cloning on the adapter driver (not all drivers support this).

    but since your old PC isn't working that will be difficult.
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