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Wireless client authenticated, but no IP assigned

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3 replies

by dreamweaver404

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Scenario:

I am trying to setup wireless network using 3Com AP2750 & WX Controller (with 6 port). The Radius server is IAS, and the user database is using Microsoft Active Directory (AD). Once authenitcated, wireless client will be assigned IP (DHCP) automatically by DHCP server. All three - the IAS, AD and DHCP are residing in the same server (same domain).

In wireless controller, only 1 Vlan available (VLan 1).

Issue:

Wireless client able to associate to wifi network and login is successful (login is automatic using Windows login name/password). Unfortunately, no client is unable to grab/being assigned with any DHCP IP.

I am not sure if this is due to IAS/AD credential authentication failure or IAS/AD and DHCP communication error.

However, if I connect the laptop via wired to the wireless controller port, I am able to login, assigned an IP, and ping/access everywhere in the network.

Appreciate all suggestions and advise!

3 replies

by fregeus

When you get authenticated via the wireless connection and you are waiting for an IP address, if you look at the DHCP DB, do you see an address assigned to your PC?

If yes, then the address is not reaching your machine somehow and the problem may be difficult to solve.

If no, then there is a good chance that the DHCP server did not receive the DHCP request.
Have you looked at the logs to see if it shows getting a request? Have you configured your 3Com wireless device to forward DHCP requests to your server? It's a easy thing to overlook.

GL

by dreamweaver404

Once authenticated, I do not see any IP at all, except the default NIC IP (DHCP) of 169.xx.xx.xx (command: ipconfig /all). But when connecting via wired (directly connecting laptop ) to the Controller, I am able to get an IP.

For the 3Com, all depends on the Wireless Controller, and I believed the config was already in proper order.

In Windows 2003 server Event Viewer log, the only missing entry in the "successful authentication" log was the authentication server name. But not sure if this could be the main reason as all services (IAS, AD & DHCP) are residing in the same server.

Thanks

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