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Network problem: can ping, get ip from dns, but can't access internet

Posted on 2004-08-09
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Last Modified: 2010-04-11
Hi there,

I have one customer that is having problems with the internet connection. They get their IP addresses from a router (linksys router). They can access the network fine. They can ping internal and external IPs, they even can get the IP from their local DNS server, which is a Windows 2000 Server DNS server.

Problem is that they can't access internet at all, IE, FTP, Outlook, MSN, etc

weird thing, is they can ping, lets say a website like yahoo by typing ping www.yahoo.com, and its going fine. When I go on IE, its not working, either by the IP...

Another more weird thing, is that their server is accessing Internet just fine, he goes on every single website I tried.

Their machine is configured to get an IP from DHCP, but they specify a DNS Server in windows.

Its been hours I try to find an answer for this, and I can't figure it out.. usually, if you can at least ping externaly by IP and by name, everything else should work...

Anyone have ideas?

Thanks
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Question by:e_poirier
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17 Comments
 
LVL 8

Expert Comment

by:Marakush
ID: 11757209
Just for giggles,

Can you add a DNS server to the list of DNS servers?

204.97.92.2

Just to see what happens...

If this dosen't work. Can you check the security setting in IE??

Marakush
0
 

Author Comment

by:e_poirier
ID: 11757299
Doesn't work, thanks thought,

From their server, I can access to anything, but its come when PC from the network trying to access internet... but they access local network just fine..

Also, security settings didn't changed anything, even with everything enable
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LVL 9

Expert Comment

by:LinuxNubb
ID: 11757336
How are the PC's accessing the internet?  Directly through router?  Proxy?  Through server?  I would say it's a firewalling issue.  Can you telnet to port 80 on a webserver?  example:   telnet www.dell.com 80    This should get you into dell web server.  If it can't, and you CAN ping the same server, it's a firewall problem (anything from linksys, server or even local like windows firewall).
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Author Comment

by:e_poirier
ID: 11757428
Computers accessing internet trought a switch, which is connected to the router.

It does ping the www.dell.com site (well, its see the IP since dell.com can't really answer pings)

To my knowledge, they do not use any firewalls. Surely not on the router since the server is working.

The only thing that the customer told me that maybe could be the problem, but I doubt, is he said that her secreteray got Netsky virus this morning.

Also, everything was working well before their first router goes down.. I have replaced with their old router which has the same configs than the new one. they are using the old one actually since the Internet wasn't working at all with the new.

0
 
LVL 41

Expert Comment

by:stevenlewis
ID: 11758635
You don't say what OS, but for XP try this winsock fix
http://members.shaw.ca/techcd/WinsockXPFix.exe
98 try this one
http://www.cexx.org/newnet.htm

" LSP-Fix, that repairs corrupted Winsock stacks. This can be used to remove entries left behind by New.net and similar software, restoring access to machines that cannot connect to the Internet. You can download it here."


0
 

Expert Comment

by:Frente69
ID: 11758637
Can you log onto the linksys router?
If you can then check and make sure that the connection status is up on the router. I'm not sure what menu that is under for the linksys but it should be talking about ppp connection status. If the link is down it means the router is not connected to the dsl
0
 

Expert Comment

by:Frente69
ID: 11758651
Sorry ignore me,.. i didn't read the intial question well properly ;-)
0
 
LVL 4

Expert Comment

by:shad0_cheng
ID: 11758790
If the ping works then DNS is resolving IPs, so what error are you getting in IE?

Since the command prompt doesn't use the proxy settings in IE I would check that out, generally if they are connected to the router through switches then IE shouldn't need proxy settings.

Also, login to the router and make sure they are not BLOCKED from the internet access.
0
 
LVL 13

Expert Comment

by:WillHudson
ID: 11761055
Is the "Automatically detect settings" option ticked under connections within internet explorer?
0
 
LVL 13

Expert Comment

by:WillHudson
ID: 11761059
Is the "Automatically detect settings" option ticked under connections within internet explorer?
0
 
LVL 6

Expert Comment

by:vand
ID: 11763383
Check add/remove to ensure a proxy client has not been installed.

Might want to run spybot or adaware as well.
0
 

Author Comment

by:e_poirier
ID: 11765807
Well, problem is somewhat fixed.

I have plugged back their old router, and the Internet worked again !!!  more impresive, the internet worked. so its really not in the Windows workstations configurations taht the problem was. I brought the new router with me to check what is going on with it. At least its working..


Thanks to all of you.
0
 
LVL 4

Expert Comment

by:shad0_cheng
ID: 11767126
so you reseted the router and it works?
0
 

Author Comment

by:e_poirier
ID: 11767261
Yes, yesterday, this router was getting IP from their ISP, but there was no way to get on the internet. Plugged it back this morning, and its work..
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