Starting a week and half ago my router stopped working with my cable modem. I went to sleep with it working and woke up with it not. I swapped in another router and am still having issues; I was gone for 10 days so now I'm back to trying to figure it out. While I was gone I left everything (cable modem, router, and computer) powered off.
My setup:
- Comcast Ambit cable modem (from Comcast)
- Netgear WGR614 v4 router --> replaced with Linksys WRT54GS v1.1
- Windows XP SP3
- other computers, all currently unplugged
- The modem is using the firmware (ver 2.105.2001) provided by Comcast; hardware version 1.3
- The Linksys router is using FW ver 4.71.4 (latest for this release of HW), factory defaults
- I am only using the wired connections; no wireless.
- I have swapped out all of the cat5 cable.
- The router is cloning the MAC address of my PC (according to Comcast, this is not needed)
If I plug my computer directly into the cable modem, I can ping by name or number. Everything works perfectly.
If I plug my computer into the router and the router into the modem, I cannot access anything outside of my local network. This is the exact setup I've used for the past 5 years; there were no changes in the past year.
Now here's the interesting part: I can log into the Linksys router and get status information from it; everything appears good. Using the Diagnostics, I can run ping and traceroute to any site on the internet. These work perfectly. From my computer, I can ping the router and the modem. However, I cannot ping anything on the internet by with name or number. If I plug in another computer, I can ping it successfully.
I've included two transcripts below that show these two attempts. Addresses, DNS, gateways, etc. look good. I cannot access the internet through either router.
I am at a loss here. Suggestions? Help!
Computer to Router to Cable Modem
C:\>ipconfig /renew Windows IP Configuration Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : hsd1.ca.comcast.net. IP Address. . . . . . . . . . . . : 192.168.1.100 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 192.168.1.1 C:\>ipconfig /all Windows IP Configuration Host Name . . . . . . . . . . . . : wynton Primary Dns Suffix . . . . . . . : Node Type . . . . . . . . . . . . : Unknown IP Routing Enabled. . . . . . . . : No WINS Proxy Enabled. . . . . . . . : No DNS Suffix Search List. . . . . . : hsd1.ca.comcast.net. Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : hsd1.ca.comcast.net. Description . . . . . . . . . . . : Intel(R) 82562V-2 10/100 Network Connection Physical Address. . . . . . . . . : 00-1D-09-9B-45-EB Dhcp Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes IP Address. . . . . . . . . . . . : 192.168.1.100 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 192.168.1.1 DHCP Server . . . . . . . . . . . : 192.168.1.1 DNS Servers . . . . . . . . . . . : 68.87.76.178 68.87.78.130 Lease Obtained. . . . . . . . . . : Monday, March 22, 2010 10:21:55 PM Lease Expires . . . . . . . . . . : Tuesday, March 23, 2010 10:21:55 PM C:\>ping google.com Ping request could not find host google.com. Please check the name and try again . C:\>ping 74.125.19.104 Pinging 74.125.19.104 with 32 bytes of data: Request timed out. [...snip 3 more failures...] Ping statistics for 74.125.19.104: Packets: Sent = 4, Received = 0, Lost = 4 (100% loss), C:\>route print =========================================================================== Interface List 0x1 ........................... MS TCP Loopback interface 0x2 ...00 1d 09 9b 45 eb ...... Intel(R) 82562V-2 10/100 Network Connection - Pa cket Scheduler Miniport 0x10004 ...00 0a 3a 6f 68 41 ...... Bluetooth LAN Access Server Driver - Packet Scheduler Miniport =========================================================================== =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 0.0.0.0 0.0.0.0 192.168.1.1 192.168.1.100 20 127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1 169.254.0.0 255.255.0.0 192.168.1.100 192.168.1.100 20 192.168.1.0 255.255.255.0 192.168.1.100 192.168.1.100 20 192.168.1.100 255.255.255.255 127.0.0.1 127.0.0.1 20 192.168.1.255 255.255.255.255 192.168.1.100 192.168.1.100 20 224.0.0.0 240.0.0.0 192.168.1.100 192.168.1.100 20 255.255.255.255 255.255.255.255 192.168.1.100 192.168.1.100 1 255.255.255.255 255.255.255.255 192.168.1.100 10004 1 Default Gateway: 192.168.1.1 =========================================================================== Persistent Routes: None C:\>
Computer to Cable Modem Directly
C:\>ipconfig /renew Windows IP Configuration Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : hsd1.ca.comcast.net. IP Address. . . . . . . . . . . . : 71.204.149.195 Subnet Mask . . . . . . . . . . . : 255.255.252.0 Default Gateway . . . . . . . . . : 71.204.148.1 C:\>ipconfig /all Windows IP Configuration Host Name . . . . . . . . . . . . : wynton Primary Dns Suffix . . . . . . . : Node Type . . . . . . . . . . . . : Unknown IP Routing Enabled. . . . . . . . : No WINS Proxy Enabled. . . . . . . . : No DNS Suffix Search List. . . . . . : hsd1.ca.comcast.net. Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : hsd1.ca.comcast.net. Description . . . . . . . . . . . : Intel(R) 82562V-2 10/100 Network Connection Physical Address. . . . . . . . . : 00-1D-09-9B-45-EB Dhcp Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes IP Address. . . . . . . . . . . . : 71.204.149.195 Subnet Mask . . . . . . . . . . . : 255.255.252.0 Default Gateway . . . . . . . . . : 71.204.148.1 DHCP Server . . . . . . . . . . . : 68.87.76.10 DNS Servers . . . . . . . . . . . : 68.87.76.178 68.87.78.130 Lease Obtained. . . . . . . . . . : Monday, March 22, 2010 10:18:50 PM Lease Expires . . . . . . . . . . : Monday, March 22, 2010 11:12:31 PM C:\>ping google.com Pinging google.com [74.125.19.99] with 32 bytes of data: Reply from 74.125.19.99: bytes=32 time=20ms TTL=55 [...snip 3 more success...] Ping statistics for 74.125.19.99: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 17ms, Maximum = 28ms, Average = 20ms C:\>ping 74.125.19.104 Pinging 74.125.19.104 with 32 bytes of data: Reply from 74.125.19.104: bytes=32 time=18ms TTL=55 [...snip 3 more success...] Ping statistics for 74.125.19.104: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 16ms, Maximum = 18ms, Average = 17ms C:\>route print =========================================================================== Interface List 0x1 ........................... MS TCP Loopback interface 0x2 ...00 1d 09 9b 45 eb ...... Intel(R) 82562V-2 10/100 Network Connection - Packet Scheduler Miniport 0x10004 ...00 0a 3a 6f 68 41 ...... Bluetooth LAN Access Server Driver - Packet Scheduler Miniport =========================================================================== =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 0.0.0.0 0.0.0.0 71.204.148.1 71.204.149.195 20 71.204.148.0 255.255.252.0 71.204.149.195 71.204.149.195 20 71.204.149.195 255.255.255.255 127.0.0.1 127.0.0.1 20 71.255.255.255 255.255.255.255 71.204.149.195 71.204.149.195 20 127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1 169.254.0.0 255.255.0.0 71.204.149.195 71.204.149.195 20 224.0.0.0 240.0.0.0 71.204.149.195 71.204.149.195 20 255.255.255.255 255.255.255.255 71.204.149.195 71.204.149.195 1 255.255.255.255 255.255.255.255 71.204.149.195 10004 1 Default Gateway: 71.204.148.1 =========================================================================== Persistent Routes: None
route print
?route print
to both outputs.