Desktop cannot access vlan, but laptop can
Posted on 2005-05-04
I have Cisco 4506 core, 3550 edge switches. I have a cable modem setup in a different building. I created a vlan for this cable modem, plugged it into my edge switched, trunked the switches, and ran it back to my office. If I plug my laptop into the vlan port on my 4506, I get the cable modem ip address and can access the internet perfectly. When I take the exact cable and plug it into any of my two desktops, I get a 169.x.x.x invlaid address. I have tried different nics, different desktops, nothing works on the destkops but works perfect on the laptop.
Since it does work on the laptop I can assume that the VLAN is setup correctly. My laptop uses a Intel PRO/1000MT adpater. The desktops I tried to connect it to had a NETGEAR FA311 Rev c1, Intel Pro/1000 CT, and a Linksys LNE100TX. If I plug in a cable that is on my normal network vlan, I get a normal ip address of my internal network and I can access my network. Only when I plug this cable from the cable modem vlan I get a invalid IP on my desktops, but works perfect on my laptop.
My OS on all machines is XP sp2. No firewalls are enabled.