Can't Connect To DNS Or Ping But Get IP From DHCP

Aug 28, 2012

My parents Windows 7 PC has suddenly stopped being able to connect to the Internet. Using the "Diagnose problem" feature in the Manage Network Interfaces panel results in a message claiming that it cannot reach the DNS server and that the connection needs to be reset. Doing so has no effect. It is connected to a DSL router via an ethernet cable.The NIC is set to dynamically receive its IP and DNS settings via DHCP which it obtains from the DSL router. Executing ipconfig from a DOS prompt shows that this is occurring as expected, with an assigned IP of The gateway and dns are set to the IP address of the router, which is Note that I can't even ping the router at also tried static settings in the available range and tried using open DNS IP addresses.

They also have a laptop which connects to the same router wirelessly using DHCP and it is working fine. Using this laptop, I can log into the router and see both it and the problem PC in the list of connected devices, each with the dynamically assigned IP addresses as seen using ipconfig on each. Unplugging the ethernet cable shows the connection status changing in the list of connected devices in the router. From the laptop, I can ping the router and running ipconfig shows that it obtains the same gateway and dns as the PC and the next available IP - 1292.168.2.11.So this leads me to believe the following:

1- The router, NIC and cat 5 ethernet cable are working fine at the hardware level.

2- The DNS settings in the router are fine, as the laptop works

Perhaps coincidentally, the same day it stopped working they received one of those bogus "This is Microsoft calling" calls claiming their PC was infected, but they had heard of the scam and hung up. Naturally, I started suspecting a virus, but a full system scan using McAffee produced nothing. If it was a DNS changing virus, would I not still be able to ping the router using the IP address?

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Jan 21, 2011

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I also did "ip default-gateway", which is the default gate way assigned by the ISP.I also typed "ip name-server" to setup the new DNS, am I doing anything wrong?  I can't even use the router to ping google, but if I connect the laptop directly to the outside line, then it works, so I know the outside line is good.
Why can't I connect to the internet?  I wasted several hours already trying everything in my book to trouble shoot a supposedly very simple configuration change.  Do I need to change something related to NAT when changing to Static IP?  My NAT was working just fine before when under DHCP.
The below is my full config (some IPs changed to preserve anonymity):

Building configuration...
 Current configuration : 16628 bytes
version 12.4
no service pad
service tcp-keepalives-in
service tcp-keepalives-out


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hostname vpn-router-2901 
username ****** password *****
enable secret *****


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interface Ethernet0 description uplink towards the techsavvy modem speed 100 nameif outside security-level 0 ip address dhcp setroute !interface Ethernet1 description >>> WIFI LAN ACCESS <<< nameif inside security-level 100 ip address


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Microsoft Windows [Version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
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