Wireless Access

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Frequent Contributor II
Posts: 125
Registered: ‎11-06-2007

DHCP server on wireless not working

Hello,

 

I'm trying to set up a DHCP Server linked to a wireless connection, the server is up, but when a client authenticates to the same server SSID, the client is unable to get an ip.

Seems like the controller doesn't send DHCP DISCOVER messages from the client to the server in the same SSID.

I have reviewed both Broadcast supression at VAP, also wireless client communication  is allowed.

I have checked that client can authenticate, but once it does, it can't get ip from DHCP.

 

Someone can help me about this issue??

Aruba
Posts: 1,644
Registered: ‎04-13-2009

Re: DHCP server on wireless not working

Please share the role details for the client.    Find out what role the client is in after connecting (show user).  Then issue a show rights <name-of-role> to view that policies are set and to ensure DHCP is allowed.

 

Also, is the VLAN that the user is being put onto a VLAN trunked on the controller?    Do you have/need IP Helpers for the DHCP server?

 

To troubleshoot the DHCP request, enable DHCP debugging and view the logs:

 

config t

logging level debugging network subcat dhcp

show log network | include <mac-of-client>

 

Disable debugging when done:

no logging level debugging network subcat dhcp

------------------------------------------------
Systems Engineer, Northeast USA
ACCX | ACDX | ACMX

Frequent Contributor II
Posts: 125
Registered: ‎11-06-2007

Re: DHCP server on wireless not working

It's very strange, the wireless client authenticates, don't get ip and the controller says there is no user.

Attached you have the logs, the user is umhnet\jramon, the wireless client mac is 00:1c:bf:82:aa:25

 

Thank you

Guru Elite
Posts: 21,257
Registered: ‎03-29-2007

Re: DHCP server on wireless not working

jgarciav,

 

what is the output of "show station-table | include 00:1c:bf:82:aa:25"

 

Is this the only device that cannot get an ip address on VLAN 102?

What are the ACLs in the role "corporativo"?  Does the role corporativo have a VLAN in it?

 

Type "show rights corporativo" and give us the output.



Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

Frequent Contributor II
Posts: 125
Registered: ‎11-06-2007

Re: DHCP server on wireless not working

Hello,

 

Any device can get ip address, we connect to SSID linked to vlan 100 not 102.

Role corporativo doesn't have Vlan attached to it, it's SSID "congreso" which is linked to Vlan 100.

 

For clarification, the DHCP server is one laptop also connected by wireless to SSID "congreso" and whithout DHCP, it has the manual ip configured, we try to get ips from this DHCP for wireless clients also connected to SSID "congreso".

Both clients and DHCP server are in the air, all connected to SSID "congreso".

 

Here you have the commands:

 

(aruba_master) #show station-table | include 00:1c:bf:82:aa:25
00:1c:bf:82:aa:25 umhnet\jramon corporativo 00:00:01 Yes ap-E06.1.04_sw10.102_p0/46 congreso g No aaa_perfil_dot1x

 

 

(aruba_master) #show rights corporativo

Derived Role = 'corporativo'
Up BW:No Limit Down BW:No Limit
L2TP Pool = default-l2tp-pool
PPTP Pool = default-pptp-pool
Periodic reauthentication: Disabled
ACL Number = 68/0
Max Sessions = 65535


access-list List
----------------
Position Name Type Location
-------- ---- ---- --------
1 denegar_acceso_aruba session
2 permitir_dhcp session
3 allowall session

denegar_acceso_aruba
--------------------
Priority Source Destination Service Action TimeRange Log Expired Queue TOS 8021P Blacklist Mirror DisScan ClassifyMedia IPv4/6
-------- ------ ----------- ------- ------ --------- --- ------- ----- --- ----- --------- ------ ------- ------------- ------
1 192.168.18.6 any any permit Low 4
2 192.168.18.5 any any permit Low 4
3 192.168.133.4 any any permit Low 4
4 any direcciones aruba any deny Yes Low Yes 4
permitir_dhcp
-------------
Priority Source Destination Service Action TimeRange Log Expired Queue TOS 8021P Blacklist Mirror DisScan ClassifyMedia IPv4/6
-------- ------ ----------- ------- ------ --------- --- ------- ----- --- ----- --------- ------ ------- ------------- ------
1 any any svc-dhcp permit Low 4
allowall
--------
Priority Source Destination Service Action TimeRange Log Expired Queue TOS 8021P Blacklist Mirror DisScan ClassifyMedia IPv4/6
-------- ------ ----------- ------- ------ --------- --- ------- ----- --- ----- --------- ------ ------- ------------- ------
1 any any any permit Low 4

Expired Policies (due to time constraints) = 0

(aruba_master) #

 

 

 

 

Guru Elite
Posts: 21,257
Registered: ‎03-29-2007

Re: DHCP server on wireless not working

Put the "allowall" acl to the top of corporativo and try again.

 

You have a laptop providing DHCP?



Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

Frequent Contributor II
Posts: 125
Registered: ‎11-06-2007

Re: DHCP server on wireless not working

Hi again

 

I have tried but still don't get ip.

 

(aruba_master) #show rights corporativo

Derived Role = 'corporativo'
Up BW:No Limit Down BW:No Limit
L2TP Pool = default-l2tp-pool
PPTP Pool = default-pptp-pool
Periodic reauthentication: Disabled
ACL Number = 68/0
Max Sessions = 65535


access-list List
----------------
Position Name Type Location
-------- ---- ---- --------
1 allowall session
2 denegar_acceso_aruba session
3 permitir_dhcp session

allowall
--------
Priority Source Destination Service Action TimeRange Log Expired Queue TOS 8021P Blacklist Mirror DisScan ClassifyMedia IPv4/6
-------- ------ ----------- ------- ------ --------- --- ------- ----- --- ----- --------- ------ ------- ------------- ------
1 any any any permit Low 4
denegar_acceso_aruba
--------------------
Priority Source Destination Service Action TimeRange Log Expired Queue TOS 8021P Blacklist Mirror DisScan ClassifyMedia IPv4/6
-------- ------ ----------- ------- ------ --------- --- ------- ----- --- ----- --------- ------ ------- ------------- ------
1 192.168.18.6 any any permit Low 4
2 192.168.18.5 any any permit Low 4
3 192.168.133.4 any any permit Low 4
4 any direcciones aruba any deny Yes Low Yes 4
permitir_dhcp
-------------
Priority Source Destination Service Action TimeRange Log Expired Queue TOS 8021P Blacklist Mirror DisScan ClassifyMedia IPv4/6
-------- ------ ----------- ------- ------ --------- --- ------- ----- --- ----- --------- ------ ------- ------------- ------
1 any any svc-dhcp permit Low 4

Expired Policies (due to time constraints) = 0

 

 

 

Yes, I have a laptop connected by wireless as DHCP server, and others laptops connected to the same SSID as clients.

 

It's worth mention that VLAN 100 has an external router as default gateway, then if I configure a dhcp helper at the router  (ip helper address ) with the DHCP ip then the others laptops get ip.

 

I mean, the DHCP DISCOVER packet is going out the controller to the external router, then it converts it from broadcast to unicast and send it to DHCP, then the client can get ip.

Thank you

 

Guru Elite
Posts: 21,257
Registered: ‎03-29-2007

Re: DHCP server on wireless not working

If your dhcp server is wireless, I might not be able to help you, because that is not a scenario we encounter.


Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

Aruba
Posts: 1,644
Registered: ‎04-13-2009

Re: DHCP server on wireless not working

[ Edited ]

You mention the DHCP laptop is also wireless; when you do a show user on the controller, is that laptop in the same role as the client or a different role?   Also, have you doublechecked that the DHCP service on the laptop is bound to the proper interface (listening on the Wi-Fi interface)?

 

 

------------------------------------------------
Systems Engineer, Northeast USA
ACCX | ACDX | ACMX

Frequent Contributor II
Posts: 125
Registered: ‎11-06-2007

Re: DHCP server on wireless not working

Laptop is in the same role as client, both of them are in "corporativo" role.
Yes, rhe dhcp server is bound to wireless adapter.
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