topic Re: Not Getting IP Address from DHCP Server in ExtremeWireless (WiNG)

Not Getting IP Address from DHCP Server

Ramiz — Thu, 04 Feb 2021 13:43:40 GMT

Hi ,

we have NX 5500 Controller in Cluster mode & Adopted 410i AP .

Controller and AP are In VLAN 4 and given the static ip address to controller and AP.

created on SSID XYZ that is broadcasting and user is connected to that SSID.

now connected user is not getting IP address from DHCP server , DHCP server in VLAN 1 .

kindly help for configuration for same .

Re: Not Getting IP Address from DHCP Server

StephanH — Thu, 04 Feb 2021 13:49:55 GMT

Hello Ramiz,

are users in the new SSID in VLAN1, too? If not, you need an DHCP helper entry on your router.

If the SSID user in an different vlan for example in vlan 4, too. The DHCP request from the clients can’t reache the DHCP server without an DHCP helper entry.

Re: Not Getting IP Address from DHCP Server

Ramiz — Thu, 04 Feb 2021 14:05:31 GMT

Hi Stephan ,

Thanks for reply .

Yes users in the new SSID in VLAN 1 .

given IP address to Controller & AP as per below

NX 5500 - 10.65.37.100/24

AP 410i - 10.65.37.103/24

Broadcasting SSID @ XYZ on that SSID user is connected .

DHCP Server is on VLAN 1 .

Can we give helper command in NX5500 Controller ?

Re: Not Getting IP Address from DHCP Server

StephanH — Thu, 04 Feb 2021 14:34:17 GMT

Hello,

the helper hast to be on the router. What device on Layer 3 connectes your VLANs?

If your client vlan is in VLAN 1 you do not need an helper entry.

Easy test. Set a fix ip address on your wireless client in the new ssid and try to ping you dhcp server.

The IP of DHCP server and your client should be in the same ip network if they are in the same vlan.

Re: Not Getting IP Address from DHCP Server

Ramiz — Thu, 04 Feb 2021 15:05:21 GMT

Hi ,

Connected user that will belongs to VLAN1 & require IP from DHCP server that is on VLAN1 .

question is here assign IP address on controller & AP from VLAN 4 & broadcasting SSID user will connect and require IP from DHCP server ? so will require any helper or not

Re: Not Getting IP Address from DHCP Server

Christoph_S — Thu, 04 Feb 2021 22:47:22 GMT

Hello Ramiz,

Things you may also want to look at:

1 - VLANs 1 and 4 are allowed through ge1 port (trunk) on the AP (in AP profile on the controller)

2 - VLAN 4 is configured as the native vlan and setting ‘#ip dhcp client request options all’ is configured unless you manually entered the DGW and DNS info

3 - Both VLAN 1 and 4 are allowed through the switchports the APs are connected to

4 - You have the best practices firewall policy installed https://extremeportal.force.com/ExtrArticleDetail?an=000078342

5 - You are on the latest 7.5.1.3 code

6 - The wlan is properly mapped to vlan 1

You can also configure the vlan you want to test with on your laptop and plug the laptop into the port the AP is connect into to see if you get an IP address from said vlan.

On the AP you can run the following command to see where DORA is failing (run command and attempt the wireless connection):

#service pktcap on interface ge1 count 100 filter port 67

Rgds