IPad suddenly doesn't receive IP-address from DHCP-server

I have a wireless network running 802.11x consisting of an SMC-router/AP. The network has an additional access point - actually a homeplug device (Netgear) which however is connected to the router directly by wire (ethernet cable).
The problem is that my iPad 2 sometimes drops the assigned IP-address and won't receive a new one from the router.
This is how it looks seen from the router's admin interface:
When software-resetting the router, it delegates new IP-addresses to the various DHCP clients and also to the ipad. However, the ipad never receives these settings.
Strangely, when I renew the lease on my iPhone 4, that device does receive new settings from the router.
And even more strange: When I share the iPhone's network, the iPad will connect through that connection right away.
So far, the only way to solve this has been to remove power from the router and reboot it while keeping the iPad in the vicinity of the router's own AP instead of the other AP.
The problem isn't persistent but it reappears from time to time with no apparent reason.
Any suggestions on what could be wrong here?

Crlarsen-
One thing you did not mention, was resetting the iPad's network. Go to Settings-General-Reset-Reset Network Settings. You will need to reconnect the iPad to WiFi.
Fred

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From what I know this is to do with DHCP option 60 and 43.Normally when APs request for IP address, DHCP Server also returns the management IP Address of WLC if the VCI matches.
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ip dhcp excluded-address 10.10.30.1 10.10.30.20
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option 60 ascii """"""""""""""""""""""""CiscoAPc1250""""""""""""""""""""""""
option 43 hex f110.0a0a.1e0b.0a0a.1e0d.0a0a.1e0f.0a0a.1e11
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Log Name: Microsoft-Windows-Dhcp-
Source: Microsoft-Windows-Dhcp-Client
Date: 23/Jun/2014 12:03:21 PM
Event ID: 1001
Task Category: Address Configuration State Event
Level: Error
Keywords: (1)
User: LOCAL SERVICE
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Event Xml:
<Event xmlns="http://schemas.">
<System>
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<EventID>1001</EventID>
<Version>0</Version>
<Level>2</Level>
<Task>3</Task>
<Opcode>75</Opcode>
<Keywords>0x4000000000000001</
<TimeCreated SystemTime="2014-06-23T08:03:
<EventRecordID>363</
<Correlation />
<Execution ProcessID="988" ThreadID="7932" />
<Channel>Microsoft-Windows-
<Computer>sanddeplap.vts.com</
<Security UserID="S-1-5-19" />
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<EventData>
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<Data Name="HWAddress">F4B7E22D8721<
<Data Name="StatusCode">121</Data>
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</Event>
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The issue is that your machine is not being assigned an IP address / was unable to reach the DHCP server to receive one. The 169.254.x.x IP your machine is showing isn't assigned from DHCP, it's assigned by the local machine and is referred to as an APIPA
address.
So something is preventing your machine from reaching your DHCP server, which could one of a number of things. In the first instance I'd suggest having a look at
http://epan36.blogspot.co.uk/2012/09/eventid-1001-dhcp-your-computer-was-not.html which lists several of things that could cause this error and things you can try in order to resolve it.
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address.
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http://epan36.blogspot.co.uk/2012/09/eventid-1001-dhcp-your-computer-was-not.html which lists several of things that could cause this error and things you can try in order to resolve it.
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narendra,
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CSCuh07704 - SG300 - Hosts pull incorrect IP address from DHCP server

FYI. There will be a new release of software this month.

Dear Patrick,
Thank you for the feedback to the Small Business Support Community. You are right, the CSCuh07704 has already been given the "Resolved" status by 09-22-2013 and will be covered in the new firmware release, and just to give others a better idea of what the problem was:
B>Symptom:
Hosts will obtain incorrect IP address.
Conditions:
Issue occurs when the switch is in Layer 3 mode and embedded DHCP server is enabled.
Thank you again for your commitment and please do not hesitate to reach us back if there is anything we may assist you with in the meantime.
Kind regards,
Jeffrey Rodriguez S. .:|:.:|:.
Cisco Customer Support Engineer
*Please rate the Post so other will know when an answer has been found.

IPad wont get IP address from DHCP Server

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I see what you are trying to say but in this case its just not true. There is a problem with the iPad. Moving away from the most secure wireless technology or changing my "router" isn't a reasonable solution. We are using a current production model enterprise wireless LAN controller with lightweight access points. Its running its latest code. Its not the Free After Rebate model from the local B&M.
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NETWORKING=yes
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IPADDR:##.##.###.###
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#GATEWAY=##.##.###.###
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If this is your first experience with Oracle Linux, I recommend you perform a default installation instead of going minimal, which is just going to make things more difficult for no good reason. Enterprise Linux is not MS Windows and the difference between default and minimal installations do not compare.
You also do not want to use the rpm utility to install any software and use yum instead. The yum utility is standard. Rpm does not resolve software dependencies.
Your ifcfg-eth0 script is missing the line that specifies to use DHCP:
BOOTPROTO=dhcp
You can also use the network configuration utility, even in text mode, by typing the following at the command prompt of root:
system-config-network
If the above utility is not installed:
yum install system-config-network-tui
You will have to configure an appropriate yum repository file. The process is explained in the Oracle Linux release notes:
https://oss.oracle.com/el6/docs/RELEASE-NOTES-U5-en.html
See 3.2.3. About Oracle Linux Installation Media
Then insert the DVD or attach the DVD iso image to your virtual machine and mount it as following:
mkdir -p /media/ISOimage
mount /dev/cdrom /media/ISOimage
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LAN was down ie Users are not getting ip from DHCP server after enabling DHCP snooping

Hi All ,
Enclosed file has network connectivity diagram.
1. L3 vlan's ie 2,3,4,5 and 6 are configured on ACC-CR1 and ACC-CR2.
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Hi,
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Milan

Upgraded to Mountain Lion a week ago suddenly unable to receive incoming emails from Mail.6

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Found solution, Yeay!   No coincidence. Mountain Lion (osx 10.8, upgraded) is not compatible with Gmail if one has 2-step verification set up on their gmail security settings.
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I love this Apple community.

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Hello guys,
I have an ASA 5505 functioning as a router to connect to the Internet. Also, it is my DHCP server for my clients, and APs. When I connect my laptop to the ASA, I get an IP address and able to configure my WLC. The APs also receives an IP address from the ASA. However, when I connect to the AP wirelessly as a wireless client, my laptop is not receiving an IP address from the DHCP which is my ASA.
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Hello jsnyder81,
I have another question. This is still related to the same network.
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Unable to get IP address from DHCP

hi all,
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%LWAPP-5-CHANGED: LWAPP changed state to DISCOVERY
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%LWAPP-3-CLIENTERRORLOG: Config Command: error verifying sequence number
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Thanks.

Is that AP on the same subnet as the other AP's? The thing is, when you configure the AP with static information, you say the AP is able to join the WLC. This means that there is no issue with the AP. Now when you set the AP to use DHCP and not static, the AP does not obtain a DHCP address? Is that correct? If you have more than one AP on the same switch and on the same vlan, and only one has an issue, then maybe reset that AP to default and see if that fixes it. I'm also assuming that the vlan is being forwarded and you have enough dhcp address in the scope.

IPad suddenly doesn't receive IP-address from DHCP-server

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