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Occasional Contributor II

iap-205 does not give out ip's

I am gettign into aruba now and have 11 iap-205's setup

 

every once in a while I get calls about limited connectivity, adn when I look in the controller devices connected to an AP have a 169 ip whic means it did not get to the dhcp to get the address

 

to fix this condition I simply reboot the ap and everything is good for a bit, this happens about once a week on about 2 of my 11 AP's that I currently have

Regular Contributor I

Re: iap-205 does not give out ip's

What type of VLAN is it? Network assigned, Magic VLAN? Are you doing DHCP on the IAP or allowing a dedicated DHCP server to assign IPs? How many clients are connected to the network, and how large is the subnet they are assigned to?

 

When clients have this issues, is it all clients ,or just a few in one area?

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ACDX, ACCP, CISSP, CWNA
Occasional Contributor II

Re: iap-205 does not give out ip's

the vlan is network assigned and works 100% if I use a network cable and plug ito the same vlan and get the proper ip's

 

I have a deditcated dhcp server for this vlan

 

currently 32 people are connected to the aruba wifi network

the subnet is a /24 and ip's are available

 

this happens per ap, if I take an affected laptop down the hall it will connect to a different ap and get the proper ip and all is good

 

thanx for the help

 

Regular Contributor I

Re: iap-205 does not give out ip's

When it is happened you can try to enabled a pcap on the device and see whats going on:

 

# debug pkt type dhcp

# debug pkt dump

 

This should dump all DHCP packets to the SSH session. if you want to capture all packets on the radio until the issue happens you can try a pcap to a machine running wireshark

 

# pcap start 33:33:33:33:33:33 1.1.1.1 5555 0 5000

Replace 33:33:33:33:33:33 with the MAC of the bss you want to capture. Run # show ap bss-table to find the MAC you want to capture. Replace 1.1.1.1 with the IP of the machine running wireshark.

 

This might tell you if the packets are being sent into the network, or not even being received by the AP.

 

Are you running a new version of code? might be worth upgrading/checking release notes for DHCP fixes if you are on an older code version.

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ACDX, ACCP, CISSP, CWNA
Occasional Contributor II

Re: iap-205 does not give out ip's

I have an out put of the dhcp request and reply from a work dhcp request

 

when it happens again I will do the same and compare and will update this ticket then

 

thanx

 

Occasional Contributor II

Re: iap-205 does not give out ip's

so I ran those commands on an AP that this morning just stopped giving out ips

this is the output when the ap is working properly

dhcp: message-type: request
             hardware type: 1, len: 6, hops: 0
             txn id: 0x35f0168b, seconds elapsed: 0
             client mac: 58:94:6b:f8:c6:d4
             magic cookie: 0x63825363
      #dhcp-option: requested-ip: 172.29.102.78
      #dhcp-option: message-type: request
      #dhcp-option: dhcp-server: 172.29.100.101

 

and here is the output when the AP isn't giving out addresses

#dhcp: message-type: request
             hardware type: 1, len: 6, hops: 0
             txn id: 0x4ce48aaa, seconds elapsed: 0
             boot flags: 0x8000
             client mac: 48:51:b7:23:1d:1a
             magic cookie: 0x63825363
      #dhcp-option: requested-ip: 172.29.102.148
      #dhcp-option: message-type: request

 

the only difference is that when the ap stops giving out ip's the DHCP request is missing this line  #dhcp-option: dhcp-server: 172.29.100.101 which is the ip of the dhcp server

if I restart the ap that is having issues it will show a good dhcp request for a while but will eventually go back this state

thanx

 

 

Occasional Contributor II

Re: iap-205 does not give out ip's

so I ran those commands

the ap had 3 people on it with valid ip's and a new pc was trying to get onto the same AP

th enew pc was just getting an 169 address as it can't reach the dhcp server

 

a restart of the ap and the device connects fine

 

is there still no reason for this issue, seems to be happening to 1 or 2 out of 11 ap's

 

are these just broken units, they all connect to the same switch and access the same dhcp server

Re: iap-205 does not give out ip's

What version of code are on your IAP-205s?
Pasquale Monardo | Senior Network Solutions Consultant
ACDX #420 | ACMP
[If you found my post helpful, please give kudos!]
New Contributor

Re: iap-205 does not give out ip's

Hi - We have just implemented 12 iaps and this has happened 3 times now in 3 weeks, it's exactly the same issue as described above, is there a solution for this? A reboot of the affected iap restores connection but it's just not good enough for a brand new system.
Guru Elite

Re: iap-205 does not give out ip's

What version of code is this?


Colin Joseph
Aruba Customer Engineering

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