One computer connects to web all the time, other on occasions

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I have 2 computers on my home network, connected in a complicated way, but it
works reliably for one computer and not the other. Both computers running
Windows XP Pro, SP2 and all of the latest updates.
My setup is thus, from ISP a wireless radio router from my ISP (I can't get
DSL, cable or other here, so have to go this way), connected to a Sunrocket
VOIP router, connected to a Belkin Wireless router. So I have a couple of NAT
interfaces inbetween me and the internet. However, the computer I am on now,
works reliably and has yet to give me any problems. The other computer, not
hardware identical, but software it is pretty much identical, sometimes I can
connect to the internet, other times I cannot. The other strange things is
that the other computer is always on the internal networks, which means I can
access files from either computer. I'll gladly give more information, but
wanted to know at least a starting point on this.

Thanks
Craig
 
When the computer can't access the internet, can you ping a public IP? If yes, can you ping yahoo.com? This troubleshooting may help,

How to troubleshoot internet access issues How to troubleshoot the Internet Access issues. You just setup a network and all networking computers can see each other. However, you have one of some ...
www.howtonetworking.com/Internet/internetaccess0.htm


Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
I have 2 computers on my home network, connected in a complicated way, but it
works reliably for one computer and not the other. Both computers running
Windows XP Pro, SP2 and all of the latest updates.
My setup is thus, from ISP a wireless radio router from my ISP (I can't get
DSL, cable or other here, so have to go this way), connected to a Sunrocket
VOIP router, connected to a Belkin Wireless router. So I have a couple of NAT
interfaces inbetween me and the internet. However, the computer I am on now,
works reliably and has yet to give me any problems. The other computer, not
hardware identical, but software it is pretty much identical, sometimes I can
connect to the internet, other times I cannot. The other strange things is
that the other computer is always on the internal networks, which means I can
access files from either computer. I'll gladly give more information, but
wanted to know at least a starting point on this.

Thanks
Craig
 
I have 2 computers on my home network, connected in a complicated way, but it
works reliably for one computer and not the other. Both computers running
Windows XP Pro, SP2 and all of the latest updates.
My setup is thus, from ISP a wireless radio router from my ISP (I can't get
DSL, cable or other here, so have to go this way), connected to a Sunrocket
VOIP router, connected to a Belkin Wireless router. So I have a couple of NAT
interfaces inbetween me and the internet. However, the computer I am on now,
works reliably and has yet to give me any problems. The other computer, not
hardware identical, but software it is pretty much identical, sometimes I can
connect to the internet, other times I cannot. The other strange things is
that the other computer is always on the internal networks, which means I can
access files from either computer. I'll gladly give more information, but
wanted to know at least a starting point on this.

Thanks
Craig
Click to expand...

Craig,

From what you've described, an MTU setting is a good candidate.
<http://nitecruzr.blogspot.com/2005/06/internet-connectivity-problems-caused.html>
http://nitecruzr.blogspot.com/2005/06/internet-connectivity-problems-caused.html

If that's not it, try and describe "sometimes I can connect to the internet,
other times I cannot" in a bit more detail. How often does this problem occur?
Any pattern to it? Have you tried the same website from the other computer,
when you're having this problem with any website on this computer?
<http://nitecruzr.blogspot.com/2005/06/background-information-useful-in.html>
http://nitecruzr.blogspot.com/2005/06/background-information-useful-in.html
<http://nitecruzr.blogspot.com/2005/08/solving-network-problems-tutorial.html>
http://nitecruzr.blogspot.com/2005/08/solving-network-problems-tutorial.html
 
Craig said:
I have 2 computers on my home network, connected in a complicated way, but it
works reliably for one computer and not the other. Both computers running
Windows XP Pro, SP2 and all of the latest updates.
My setup is thus, from ISP a wireless radio router from my ISP (I can't get
DSL, cable or other here, so have to go this way), connected to a Sunrocket
VOIP router, connected to a Belkin Wireless router. So I have a couple of NAT
interfaces inbetween me and the internet. However, the computer I am on now,
works reliably and has yet to give me any problems. The other computer, not
hardware identical, but software it is pretty much identical, sometimes I can
connect to the internet, other times I cannot. The other strange things is
that the other computer is always on the internal networks, which means I can
access files from either computer. I'll gladly give more information, but
wanted to know at least a starting point on this.

Thanks
Craig
Click to expand...

When the problem occurs, can the unreliable computer access some web
sites but not others? If so, this could fix it:

1. Find the right MTU setting, as shown here:

http://www.annoyances.org/exec/show/article04-107

2. Make the setting manually on the client computers, or use
DrTCP to make it:

http://www.dslreports.com/front/drtcp.html

Otherwise, please reply with full details of the problem. We only
know as much as you tell us.
--
Best Wishes,
Steve Winograd, MS-MVP (Windows Networking)

Please post any reply as a follow-up message in the news group
for everyone to see. I'm sorry, but I don't answer questions
addressed directly to me in E-mail or news groups.

Microsoft Most Valuable Professional Program
http://mvp.support.microsoft.com
 
Well, it is working now. I changed the MTU on my computer, to match the MTU
on the "good" computer. It did not work. But my ASUS motherboard has 2
onboard network adapters, I changed to that one, and it worked. I do not know
if this is a permanent fix or not, but for the moment it is working. Thanks
for the quick response.

Craig
 
I am not able to ping a public IP, only my ISP router, and my other computer
on the internal network. But, as I said in my other post to Chuck, I changed
the MTU on my computer, to match the MTU on the "good" computer. That did not
work. But my ASUS motherboard has 2 onboard network adapters, I changed to
that one, and it worked. I do not know if this is a permanent fix or not, but
for the moment it is working. Thanks for the quick response.

Craig
 
Appreciate the help Steve, I changed the MTU on my computer, to match the
MTU on the "good" computer. It did not work. But my ASUS motherboard has 2
onboard network adapters, I changed to that one, and it worked. I do not know
if this is a permanent fix or not, but for the moment it is working.


Craig
 
Thank you for the feedback. Post back if you have any issues.

Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
I am not able to ping a public IP, only my ISP router, and my other computer
on the internal network. But, as I said in my other post to Chuck, I changed
the MTU on my computer, to match the MTU on the "good" computer. That did not
work. But my ASUS motherboard has 2 onboard network adapters, I changed to
that one, and it worked. I do not know if this is a permanent fix or not, but
for the moment it is working. Thanks for the quick response.

Craig
 
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