RE: Cannot Ping Beyond Default Gateway & DHCP Server
- From: dbir <dbir@xxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Thu, 27 Aug 2009 11:50:01 -0700
Final result: my neighbor has broadband! Problem solved.
Although the story has a happy ending, the details are muddled. The problem
was definitely in his computer. Nothing was changed on the TW side.
That computer has two ethernet NICs: one from Intel (built-in), and one
from Linksys (appears to be a part of the expalsion card with the dial-up
recepticals). Most of my testing was with the Intel NIC. I ran Intel's
diagnostics on it without problems. And, it was the Intel NIC that worked
successfully at my house. Everything described in this thread was through
the Intel card.
TW guy came today, and after showing me his TW laptop worked on my
neighbor's line (more on that later), he tried the line on the Intel NIC, and
it failed as usual. He then plugged it into the Linksys NIC, and much to my
surprise, it worked!
I had previously tested that NIC without success. Turns out the difference
is (I think), every time he moved a connection, he cleared the modem by
unplugging it for 30 seconds. I had not done that. This is an important
lesson.
We don't know why the Intel NIC didn't work on my neighbor's line, but
worked perfectly on my line. But we no longer care.
The first thing the TW guy did was to plug in his laptop and demonstrate
that it worked. But wait, I did not see him change the MAC of his laptop
(nor phone anyone). How can that be? Had him do ipconfig /all on his
laptop, and his NIC doesn't even have a MAC(!). We talked about MACs. He
says he has never had to change a MAC nor tell the home office to change one.
I never reached understanding with him on the MAC and how TW uses it to
prevent service theft. My assumption now is that this MAC control is
occurring in the cable modem, and that clearing it with power off causes it
to loose its previously-stored value.
That's all I know. Just wanted to share the end of this story, in case it
is useful for someone else in the future.
All's well that ends well. Thanks to everyone who helped.
-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.
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