Situation: Returned home from work on Thursday evening to find the family computer was "offline." I rebooted, but, was still not able to connect to the internet. I inspected the cabling, rebooted the router and modem and ran diagnostics to no avail. Router port light goes out when I disconnect the cable and lights up when the cable is replaced. Browser can't hit the router. Ping to router IP address returns timed out/unable to reach domain.
At this point, I turned on the 2nd computer and found it could reach the internet. Turned 2nd computer off.
I ran CCleaner on first computer. It found a few viruses that had previously been quarantined.
Reboot and still no internet. I can, however, print to the network printer ...
Attempted to do a restore. Will not allow me to restore.
Turned 2nd computer on again. Did some research on the internet trying to figure this out. Do an ipconfig command on 1st computer. Find no default gateway set. Only fields dipslaying info are subnet mask and IP address: "169.254.146.77" Got into the router and checked it out. Everything seemed to be fine on it....although no devices were appearing on the DHCP table.
Turn 2nd computer off, again. Really puzzled as to behavior.
Return about 1 hour later with an idea. Turn on 2nd computer to check on internet. Find 2nd computer is now behaving in same manner. No internet. cannot reach router. IP address "169.254.146.100".
ipconfig /all reveals that autoconfig is enabled and the autoconfig IP addresses are supplied on both computers.
What the hell is going on? I see no traffic going out the DSL modem. Activity light is dead. I cannot get anything in. The PCs print to the network printer so they ARE going to the router, but, something is preventing them from SEEING the router.
Any suggestions as to what to investigate and what would tinker with IP settings like this? What would prevent System Restore from running? I ran hijack this, but, nothing is jumping out at me and saying "GET RID OF ME!!!!"
Edited by EricMiller, 12 December 2008 - 02:44 PM.