Re: Cannot Ping Beyond Default Gateway & DHCP Server

dbir wrote:
In case anyone is following this, here are today's developments:

Took my neighbor's problem computer to my house and connected it directly to my Roadrunner modem. His computer accessed the internet OK without problems.

Took my healthy computer to my neighbor's house and connected it directly to his Roadrunner modem. Got the same problem symptoms (can connect, receive IP address from DHCP, and receive addresses of DNS servers, but cannot ping nor access the DNSs nor anything beyond the Default Gateway).

Spent a few hours on phone with Time Warner (Roadrunner) level 1, 2, and 3 support trying lots of things, even swapping out the (new) cable modem (desperate). Nothing worked.

We are about to give up, with my neighbor resigned to spending the rest of his life on dial-up.

Any ideas?

Don

"dbir" wrote:

My neighbor finally took the plunge to upgrade from dial-up to cable, but cannot access the internet through it. He’s using XP Home, directly connected to cable modem – service by Time Warner, which works fine for me next door. His dial-up continues to work fine, but access through his Ethernet local area connection does not. TW confirmed (with their own laptop) that the connection & modem are good, so problem must be in his computer.

Network Diagnostics shows pings to his IP, Default Gateway, and DHCP Server work, but pings to DNS servers fail. Verified manually (pings to those DNS from my computer work, so it’s not the DNS themselves). Pings to other IPs (e.g., Google’s) also fail. Connection’s Status shows lots of packets sent, but almost none received. Uninstalled Norton 360 with no effect. No other security software present, Windows Firewall turned off. TCP/IP properties and IP addresses received (DNS, DHCP) look fine (same external IP addresses my computer gets).

Other things checked:
Boot in Safe Mode yields same results. Device Manger shows no problems with Network Adapter or (hidden) TCP/IP drivers. Packet Filtering is off. All Windows components (needed or not) are installed, all services (needed or not) are started or on auto. Windows SFC ran OK.

From all the sage advice I found on this board, here’s what I’ve tried (without success):
reset TCP/IP (netsh int ip reset)
turned off ipsec service (temp)
ipconfig /flushdns
ipconfig /registerdns

So: dial-up works fine, and Ethernet HW/SW gets as far as gateway & DHCP, but can’t get to DNS nor anything else.

I’m a bit over my head, and sure need some advice. Thanks.

I don't know if it's the cause of your problems, but it appears as if your friend's computer has extraneous networking components installed.

The ipconfig results that you posted look like ipv6 is installed. It shouldn't be for XP Home.

Unless TW requires these added features for some reason, if you go to the properties of the network adapter, you should only see the following 4 items (see http://screenshots.leeindy.com/lac_general.shtml):

- Client for Microsoft Networks
- QoS Packet Scheduler [this is optional]
- File and Printer Sharing [this also is optional, and in the case of a computer connected directly to the Internet probably should not be installed without first installing a firewall]
- Internet Protocol (TCP/IP)

If uninstalling ipv6 from your friend's computer doesn't resolve things, it might be instructive to post ipconfig /all results from your computer when connected in your house.

Aside from the ipv6 issue, it really sounds as if there is a misconfiguration at the TW end of your friend's connection.

To summarize for his next call to TW:

1. His computer doesn't connect in his house.
2. His computer does connect in your house.
3. Your computer does connect in your house.
4. Your computer doesn't connect in his house.

The above facts strongly suggest a defective or misconfigured cable modem in your friend's house. However, if you have in fact tried a second modem in your friend's house with the same results, the next logical conclusion is a problem at the head end, but that doesn't explain "TW confirmed (with their own laptop) that the connection & modem are good."
--
Lem -- MS-MVP

Apollo 11 - 40 years ago: http://www.nasa.gov/mission_pages/apollo/40th/index.html
.

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