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mecheng

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Cannot access internet on network with DHCP enabled

Hopefully this is an easy fix and someone has experienced the same situation before....

On my company lan, you cannot access the internet if your machine is logged into the network with dhcp enabled. The dhcp server is assigning the correct DNS information. Attempts to ping the outside (such as yahoo.com for example) result in "request timed out", however the IP address of the domain you are trying to ping is displayed in brackets indicating that at least some communication is going on.....

Consequently, the only way I can get any of the workstations to have internet access is to disable DHCP and assign each machine a static IP. The dns and gateway information is the same as that assigned by DHCP.

Any ideas???

Thanks in advance to those that attempt to help.

James
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Pete Long
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Are you using a proxy server?? If so it the DHCP subnet allowed out??

PeteL
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mecheng

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I don't have direct access to the server machine at this time. However, we do not connect through a proxy server at the individual workstations..... We have a (3com) hardware firewall so I'm pretty sure there is no proxy set up on the server either.
if you do a tracert on the ip address of the site you are trying to reach how far does it get?

also what OS are your desktops and server?
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ASKER

To maintain consistency, I always use yahoo.com as the domain I ping.

When doing a tracert from a workstation with DHCP enabled, all requests time out.
From my machine which has a static IP, it takes me 8 hops to reach yahoo.com... all with reasonable latencies....

The server OS is Windows 2000 server and all client workstations are running Windows XP Pro.

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prelude812
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or enter your firewall address in internet explorer
Tools >internet options
connections > Lan settings
check Proxyserver, Enter your firewall address and port, clock Ok
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ASKER

When swithching from " specify an ip address" to "obtain ip automatically", the default gateway information is lost and must be re-added in the advanced dns properties.

Thanks for the help!