Cannot access the internet...

Hi all experts,

My computer has a workgroup that consists of Windows 98 computers.  They use DHCP to get the IP address.  Recently, I reinstall one of the computer Win 98 and all the applications.  I configured the Network card correctly.  But sometimes it can access the internet and sometimes it cannot.  I go to command prompt and type ipconfig/all.  I discover that when it can access the internet, the IP address is normal, like 192.168.0.X with mask 255.255.255.0.  But when I cannot connect to the internet, I checked the ipconfig/all, the IP address is 16X.xxx.xxx.xxx with mask 255.255.0.0.  But both address is assigned by the DHCP server.

I also tried to set a fixed IP address like 192.168.0.200 and mask 255.255.255.0.  I think it can talk to the Workgroup.  But it can't.

How can I discover what is the problem?  Sometimes I restart/reinstall, it can access the internet again and sometimes suddenly it can't.  

I tried ipconfig/release_all and ipconfig/renew_all too.  Sometimes, it shows it can't find the DHCP server.

Anyone can give me some idea what's going on?

Thanks for all replies.
jesshonAsked:
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OnsiteComputerMedicsCommented:
First try a new cable throughout the path to the switch or hub, if that doesn't fix it then try a different port in the switch or hub, if that doesn't fix it try a new network card.
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muhalokCommented:
The second address (with no access to internet) is probably:

169.254.x.x ? Well this is a hardcoded address that DHCP client assigns to a NIC in case it was not able to obtain an IP from a DHCP server. This is the reason.

So its either bad connectivity or your DHCP address has no free IPs left in the scope (IP pool).

So it can be a connectivity problem (when it says that DHCP is not available).

For that I would check that you don't have duplicate addresses/names on the network, check Cable (link - sometimes it down, hence impossible to get a DHCP IP).

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cyrusunccCommented:
the 169.x.x.x.x address is a "private" ip address assigned by Windows when an IP address is not recieved by the router (or whatever you have as a DHCP server).

I have had this issue before and have resolved it by spending many hours removing TCP/IP protocols, reinstalling it, etc... etc..

A simpler solution is to format the drive and reinstall the OS.  Trust me.. it will be MUCH quicker.

If this was a new problem (on a system that was working fine for a while) I'd suggest a System Restore..  however this isn't even an option because your running Win98

Format and try again.
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OnsiteComputerMedicsCommented:
The difference is his works on and off...if it consistantly doesn't work and appears to be some winsock corruption then a format is suggested for win98, but I think this is something simpler.

If you can test a working machine on the same spot as the faulty machine and see if the same issues appear.
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stevenlewisCommented:
when it doesn't work, does the link light iluminate? check the NIC and the router for lights that show at least a physical connection (although if lit it may not mean a good connection, if unlit it means there is no connection)
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