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leblanc

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DHCP not working on desktop only

This issue just happened recently. I have several users' desktops having issue getting a DHCP IP address. The strange thing is it only happens on the desktops. I have no problem with a laptop plugged into the switch port. I did a Wireshark captured and it did not show anything interesting. The only thing it showed was the DHCP discovery from the desktop. Any ideas what could cause this?

 

PS. I have port security configured on my Catalyst 4503. But even with port security disabled, the desktops still could not get a DHCP IP address.

 

Thanks
Avatar of Adam Brown
Adam Brown
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Are the workstations on the same Subnet as the DHCP server? If they are not, you will need to make sure there is a DHCP Helper configured on the router that routes between subnets to forward DHCP requests and a second scope for the workstations.
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leblanc

ASKER

Yes. I have helper configured. It was working fine before until 2 days ago.
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