Instant AP DHCP with Ip helper

[cdelarosa]

I would like  to know if you guys have seem this happening... it looks like  a bug to me...

Here is the Scenario that works
AP for example in a network 192.168.1.0/24  i got a DHCP server on that network
The AP gets its address via DHCP everything works correctly there

Scenario in which it doesnt work.

The AP is on the network 192.168.1.0/24
The DHCP Server is on the network 192.168.2.0/24
On the switch i got an ip helper  pointing to the DHCP server which is on the 192.168.2.0/24 network
The ip helper WORKS correctly because i tested it with my computer and my computer get the DHCP IP address.

As you see in the booting process
AG7240: done cfg2 0x7115 ifctl 0x10000 miictrl 
ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready
Picked up default IP a9fe7695, rand 7695
Default IP is ready

DHCP timed out.
Default IP comes up.
ip_time_handler: Got ip and packets on bond0 Started master election 4-0
DHCP timed out.
Default IP comes up.
169.254.118.149 255.255.0.0
Starting Webserver

You see it gets the default ip addresss 169.x.x.x

Now if i reboot the AP and enter in APboot MODE and do this

apboot> dhcp
eth0 up: 100 Mb/s full duplex
DHCP broadcast 1
DHCP IP address: 172.28.1.11
DHCP subnet mask: 255.255.255.0
DHCP def gateway: 172.28.1.1
DHCP DNS server: 172.16.3.215
DHCP DNS domain: carloslab.local
apboot>

You see it gets the IP...

I just want to confirm is this is a bug, or if im doing something incorrectly.

[yliu]

I think Aruba Support @ 1800-WIFILAN can help you confirm if this is a bug or not.

[jkok]

What is the OS version you are running?

[cdelarosa]

the lastest firmware to download...

I already got a case open... but i wanted to know if you guys had the same issue ?  or smoeone succesfully gave dhcp with ip helper to the instant APs?

[leon]

Hi NightShade,

DHCP relay works fine in my setup, I used a H3C switch, which switch you used?

[cdelarosa]

alcatel switches

[qmeng]

It seems work fine on H3C and Cisco Switch, but realy reproduced on Alcatel-lucent Switch.

[cdelarosa]

Well thats weird... with the one that it should work its with alcatel switches as, Alcatel sells Wireless controllers of aruba networks...

Ill try with another model to see if it works...

I also got the lastest maintanice release of my alcatel switch...

[qmeng · Accepted solution]

I try to change the Ip helper forward delay to 0 (default 3), It works for me, but It does not make sense, with same delay time can forward some discover packets success, Other discover packets failed.

-> show ip helper

 Ip helper :   Forward Delay(seconds) = 0,  

Max number of hops     = 5,  

Relay Agent Information            =  Disabled,  

DHCP Snooping Status               =  Disabled  

 DHCP Snooping Bypass Opt82-Check   =  Disabled,  

 DHCP Snooping Opt82 Format  =  Base MAC,  

 DHCP Snooping Opt82 String  =  00:e0:b1:c6:a2:c2,  

DHCP Snooping Binding DB Status    =  Disabled,

  PXE support                        =  Disabled,

   Forward option     = standard       Vlan Number NA   Bootup Option Enable   Bootup Packet Option DHCP       Forwarding Address :         10.65.77.2   UDP Relay on Default VRF = Enabled

->

[cdelarosa]

i didnt see your asnwer! i just test what you said it work perfectly now

Thank you very much man kudos!!!!!!

how did you figured that out? like you says it make no sense...