Sep 02 20:31:01 Severity:4 DHCP Client lease rejected from IPv4 router addr , MAC addr

Problem:
Time Capsule kept loosing connectivity from internet modem. ISP has no records of outages.
Logs:
Sep 02 20:31:01 Severity:4 DHCP Client lease rejected from IPv4 <router addr>, MAC <addr>
Resolution:
Make sure you TC is not connected to the same coax cable that the cable box is connected to.
Although, the system may work just fine for quite some time, eventually service will be disrupted by some device attempting to connect over and over.
For some reason, Time Capsule doesn't perform well when a device attempts to authenticate over and over, even if they device clearly isn't part of the Access Control List or even have the correct password.
So, in this case the the offending mac address was Scientific Atlanta Device, which was my cable box.
Regards!

I have seen the same issue with my iOS and Mac OS devices (iPhone and MacBook Pro). I have written my own DHCP server (http://notebook.kulchenko.com/embedded/dhcp-and-dns-servers-with-arduino) and have had troubles getting my devices to connect (Windows Vista and Ubuntu devices connect fine). I suspect that this problem happens because the DHCP Offer message is sent to a broadcast address, even though (at least in my case) the broadcast flag is off in the DHCP Discover message I see.
Unfortunately you didn't include the Discover message, so I can't tell for sure, but if it indeed has the broadcast flag set to 0, then the server should send the response message using unicast as per DHCP spec (http://www.ietf.org/rfc/rfc2131.txt, section 4.1):
If the broadcast bit is not set and 'giaddr' is zero and
'ciaddr' is zero, then the server unicasts DHCPOFFER and DHCPACK
messages to the client's hardware address and 'yiaddr' address.
So, it seems like in this case the server may be at fault, even though it would be nice for Mac OS to accept broadcast responses (and would solve my problem too).
Can someone confirm that Mac OS does not accept broadcast responses to DHCP Discover and DHCP Request messages? Thanks.
Paul.

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DHCP client lease on 2801

I'm trying to configure the DHCP client lease time on a 2801 router and can't seem to find the correct command. I've tried searching the Cisco site and found a command that looked like it would do the job (ip dhcp client lease x x x), but when I tried inputting that into the router it didn't recognize the command.
In looking through the router's commands I've found ip dhcp-client limit lease per x which seems to be an interface command and doesn't sound like what I'm trying to do.
Can anyone help?
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Are you trying to configure the lease time assigned to a client from a DHCP pool?
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122tcr/122tip1r/p1ftdhcp.htm#wp1018363

Using Extreme in Bridge mode, can't see the DHCP clients if the D-Link router

I have an Airport Extreme attached to my DLink modem/router. I have configured the Airport Extreme in Bridge mode, and I was expecting all clients to show up in my D-Link router. Although the configuration works most of the time, I have been experience a few issues:
1. From time to time, computers attached (both Windows and/or Mac) complain about an IP address conflict. I can ignore the error and it works fine.
2. From time to time, I loose Internet connectivity, and I need to disconnect my computer and reconnect again to solve the issue. This is not necessarily linked to symptom #1
3. On my D-Link router/modem (which I only use to connect my Airport to my ISP), if I check the DHCP clients, I can see the Airport router connected and *some* of the wireless clients that connect through the Airport. The list changes quite randomly, and at times, I see the airport appearing twice with different IP addresses.
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When the AirPort Extreme is in bridge mode, the AirPort Extreme is simply passing through the DHCP settings and services that are handled by the D-Link modem/router.
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I am using my 3620 instead of a netgear cable router connected to cablevision.
1) How can I see when the router dhcp lease ends so I can see if it gets another address? I have seen on past posts that there were problems with this issue. I am using 12.3(13) ios.
2) How can I see how much memory has been used by nat translations? I have 64Meg of memory.
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Hi csross,
If I understand you correct this will resolve your issue.
1) show ip dhcp binding [ip-address]
It will show you the lease expiration like the output below
Router# show ip dhcp binding 172.16.1.11
IP add Hard add Lease expiration Type
172.16.1.11 00a0.9802.32de Feb 01 1998 12:00 AM Automatic
Here you go with the link
http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cr/hiad_r/adr_s1h.htm#wp1132199
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I am still not sure of the command.
HTH
Ankur

Several questions about moving iPhoto library from PowerBook G4 to Mac Book Pro.

Hello,
So yes I was running an old PowerBook G4 laptop, had moved my iPhoto library onto a 2 TB external hard drive so I could free up space on my laptop. Now that I have a new Mac Book Pro, I decided to move the library onto it. Everything seems to have moved ok, except there seems to be a bunch of duplicates, some even have multiple copies. Now this is me looking at the events, and even the names are duplicated.
Can I safely remove and delete the duplicates, or is this just showing me the same photos / events / whathave you?
Also, I noticed when looking at the photos under library, the index shows a close up of any face that is in the photo. Is there any way to turn that feature off so I don't have to look at the same photo taking up a ton of space? Makes it harder to figure if I have duplicates.

decided to move the library onto it. Everything seems to have moved ok, except there seems to be a bunch of duplicates, some even have multiple copies
How did you move the library to the new MBP? The correct way was to connect external HD with the library to the MBP and just copy the library into the Pictures folder. Launch iPhoto with the Option key held down and select the newly copied library and open it.
At no time should one library be imported into another. That created multiple duplicates and creates a real mess of the library.
OT

EA4500 DHCP Client Table erased

My EA4500 will periodically clear out the DHCP Client Table and I will lose internet access.This happens once almost every day, normally in the morning. If I can't access the internet I will check the DHCP client table under Status -> Local Network -> DHCP Client Table and it is always empty.
After I select Setup -> Reboot it will work again - when I look at the DHCP client table it is now populated with all my devices. I am on firmware version 2.0.37.
Any help would be appreciated.
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Thanks for your help - I believe you may be correct.
I changed the DHCP client lease time from 0 (!day) to 8640 (6 days) and so far no problems this morning. If it lasts another 24 hours I will know for sure.
I don't think there is a newer firmware version than this: 2.0.37.131047
Bruce

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As the most expensive and hyped "consumer router" at the local big-box stores, and after already returning a Netgear N600 that appeared to be defective, I had high hopes that this router would work properly and I could stop fooling with router settings and move on to real work. And I'll acknowledge that for a lot of folks this router will probably be fine. I didn't do any speed measurements or methodical testing, but it seems pretty fast and using it for more than three weeks it seemed reliable. However, it had several issues that were maddening and ultimately for me, unacceptable. Summarized as follows:
> The DHCP client list NEVER displays all the clients connected on my network, no matter how many times I look. These clients are actively transferring data, and I can download free programs from the web that report all clients reliably. Why is this so difficult??
> The logging feature is ridiculous - it often didn't log events that I knew had occurred, and even when they were shown, you would only see an entry if you checked the log very quickly after the event (some sort of "auto-flush" function that makes the whole feature pretty useless).
> The previous issues are annoying - but this was the deal-breaker. I could not connect to an OpenVPN device on my network through this router. I could connect to the device locally, I could connect to other devices remotely through other forwarded ports, and I could see in the log (if I looked quickly enough) that the router was seeing the connection attempt to the OpenVPN device, but it was getting blocked. Many hours searching forums and experimenting with router settings / firmware updates did not help.
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With reference to your post I would like to know that does all the client devices on your network runs on DHCP or some of them have static IP address as well? The devices which are running on static IP address will not be displayed in the DHCP client table.
Regarding the logs that are not being created on the router for any event that takes place could be because of the reason that you might be using another router or a gateway before your linksys router.
As far as your VPN issue is concerned please try to disable the firewall of the router and then try to connect to the open VPN device because this router acts like a VPN passthrough. Click on the following link to know how to disable the router's firewall http://www6.nohold.net/Cisco2/ukp.aspx?vw=1&docid=87795adab27b4bd7a432e03be4e28e8d_17347.xml&pid=80&...

DHCP client fails to get an valid IP address from DHCP server. windows 8.1

I have a win 8.1 Pro 64 bit pc in my office .I'm trying to connect it to my wireless cisco router with either wireless or hardwired connection but I get an error in the event viewer with discription DHCP error 1007. and Ip address showing
169.254.93.17 but our dhcp range is 192.168.1.x
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
Computer: sanddeplap.vts.com
Description:
Your computer was not assigned an address from the network (by the DHCP Server) for the Network Card with network address 0xF4B7E22D8721. The following error occurred: 0x79. Your computer will continue to try and obtain an address on its
own from the network address (DHCP) server.
Event Xml:
<Event xmlns="http://schemas.">
<System>
<Provider Name="Microsoft-Windows-Dhcp-
<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" />
</System>
<EventData>
<Data Name="HWLength">6</Data>
<Data Name="HWAddress">F4B7E22D8721<
<Data Name="StatusCode">121</Data>
</EventData>
</Event>
I tried to track issue with microsoft network monitor I'm attaching the capture file also please help me to sort out this issue
capture report https://onedrive.live.com/redir?resid=AFE3D0245A92F6F8%21183

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.
If none of those work, can you confirm whether you have any other machines connecting via the same method on the network, which might indicate whether this is an issue at the machine end or somewhere between the machine and DHCP server?

Missing hostname in DHCP Client Table???

I give up. I've searched the internet for an answer to why my mac's hostname does not show up in my WRT54G's DHCP Client Table and come up empty. I see host names for my windows and linux boxes, but not my macbook pro. Anyone have a clue?
Thanks,
Steve

I have a BEFSR81 with the latest firmware (2.51.3) and I have also noticed missing hostnames in the DHCP Client Table. I have a couple of scenarios that this appears to happen.
The first case is if the router is power cycled, the DHCP Client Table will obviously be empty, but even waiting up to 24 hour later for a default renewal, the hostnames are not updated and most remain empty. The only way to get the hostnames to appear is to reboot the machines where the hostname field is empty.
The second case is that some of my network devices never have hostnames in the router's DHCP Client Table.
The last case is when the entire network (machines as well as the router) is restarted. The router is started first and there are no Clients in the DHCP Client table. Then the clients are started and the DHCP Client Table fills up. After 24 hours, the client table will slowly degrade to have several missing hostnames, but the machines are still there and they are at the same address.
Is this a known problem with this router?
I had a Vonage router (Linksys RT31P2) and never had these problems. On the RT31P2, the DHCP Client table always had all the hostnames.
Message Edited by kae on 01-10-2008 05:07 PM

Why can't Windows 7 be forced to use DHCP broadcast lease renewal?

I have been going to this coffee shop for 11 years. It still has the same ADSL-based wireless internet service (an old wireless access point connected to the internet through ADSL).
The ONLY way to communicate with the DHCP server in this wireless AP is via broadcast - lease renewal requests to the DHCP server via direct IP address are IGNORED. On top of that, the DHCP IP assignment pool is rather small, so to compensate the DHCP lease
time is set to expire every 10 minutes. This is no problem normally, because an active DHCP client will request a lease renewal at half the lease time, or 5 minutes before the lease expires.
Here is my problem: I had my registry setup to force DHCP broadcast and all was happy - UNTIL Microsoft decided to have an update ADD a "toggle broadcast" flag to the registry and make it impossible to override (so far, in spite of the kb928233
page that supposedly tells you how to do so). Ever since then, I lose my DHCP lease (and therefore my internet connection) EVERY 10 MINUTES.
BTW, the KB928233 page has manual registry editing instructions that are so poorly written that at least 2 or 3 different interpretations of those instructions exist. I tried at least 3 different interpretations of those instructions - none worked. A good
part of the problem is no examples were given of what the resulting key tree should look like in regedit.
I have invested at least 2 days in Google searches and various attempts to get these flags set the right way again - all to no avail. If I can't figure out how to solve this problem in 2 days of trying something is dreadfully wrong. Again, with emphasis,
this USED TO WORK until somebody decided to put in a windows update that broke it.
All I want to know is: for a particular wireless connection how to force broadcast DHCP lease renewal. Some update in the last several months seriously broke that, making it nearly impossible to force broadcast mode. Oh yeah, it does a broadcast renewal
request EVENTUALLY - AFTER THE CONNECTION WAS TERMINATED! That is useless - I just lost my remote terminal session or file transfer. I need it to do the broadcast request BEFORE the lease terminates.

About 3 years ago (IIRC), when I first encountered this problem I used Wireshark to see what was going on. In the link you gave, the second bullet point under item 1 states that a broadcast DHCP renewal request would be given at 87.5 percent of the lease
time. Wireshark never indicated that such a broadcast renewal went out. It did show the directed request at the 50% point.
There is one other thing that may be relevant: at the time this problem re-appeared several months ago, a new registry flag also appeared: DhcpConnEnableBcastFlagToggle which was set to 1. I didn't put it there, so I surmise it came from a Microsoft update.
At this same time the DhcpConnForceBroadcastFlag that I had set to 1 to fix my problem had been reset to 0, thus re-creating my problem.
I have not looked at the traffic with Wireshark this time around, but I do know that I could use regedit to set the DhcpConnForceBroadcastFlag to 1, but 10 minutes later (at the exact second of the DHCP lease expiration) the connection was momentarily interrupted
and when I did a regedit refresh, DhcpConnForceBroadcastFlag was now reset to 0 with a new lease expiration and *start* time.
I suspect Windows rather than the access point for this reason: on a hunch last night, I tried stopping the DHCP client service, using regedit to set the DhcpConnForceBroadcastFlag to 1, then starting the DHCP client service. After this, at the DHCP lease
expiration time there was no interruption of the connection, the DhcpConnForceBroadcastFlag was still 1 afterwards, and the DHCP lease time had been extended another 10 minutes with no new DHCP lease start time.
So now my problem appears to be solved once again - and hopefully not temporarily this time.
The laptop I am using has Windows 7 Home Premium edition with SP1 on it with all the latest updates. It does not appear to me to behave in the manner given in your TechNet note on Lease Renewals. If it would behave that way, I would not have had this problem.
I am fully aware that the KB I list is for Vista - it was the only information I could find in what otherwise appears to be a void of information.

WRT 160 N Router, DHCP client list has no clients

In the DHCP client list under status there are no computers listed. And under the DHCP reservation list it only lists one when I refresh? I've update firmware and refreshed and even rebooted router several times.

Do you have static IP addresses assigned on all workstations? In that case the DHCP client table might be empty.

(ask) WRT54GC Static DHCP client name always "unknown"

I use WRT54GC for gateway for my internet connection. I have several wired computer that connect to switch that connet to WRT54GC. I have set Static DHCP as in manual book and name each MAC address. But in DHCP client list the name always show "unknown". Anyway to fix this? Thank you.
Message Edited by scannerfm77 on 07-29-2008 08:12 PM

The router DHCP will not show client using Static IP in the network .....
If you are using "Obtain IP settings" .... then the IP address ...computer name & MAC address ... will be there ...

I want to reserve a static IP address on my Airport extreme. What is the difference between reserving by MAC Address and DHCP Client ID?

I want to understand the differences in the way you can reserve a static address for a device on the network. I had previously set the device itself to an address and then reserved it with DHCP Client ID, which I thought was just the devices static addresss. I'm not sure if this was in fact correct or just happend to work. I know what a MAC address is, but I'm not really sure what the DHCP Client ID is. So it would be great if someone could clarify it, and the difference between reserving address by MAC Address or DHCP Client ID.

A MAC address is a unique identification consisting of letters and numbers in a form that looks like this:
xx:xx:xx:xx:xx:xx
Every network device has a MAC address, which can be found on a label on the bottom or back of the device. Apple calls this the Ethernet ID.
A DHCP Client ID is an optional name that you can assign to a device. For example, on your Mac....
Open System Preferences (gear icon on the dock)
Open Network
Click on Ethernet
Click Advanced at the lower right
You may be able to edit the DHCP Client ID here....for example.....you could enter MJ500's MacBook in the space provided. That would be the Client ID of your Mac.

Cisco ASA 5505 and DHCP Client Problems

Hi, i have a problem. I've connected my ASA appliance to an ADSL modem, and i dont get an DHCP address on the outside interface (e0/0). I use the asa-722-19.bin firmware.
I turned on the debugging for the DHCP client and could see that the ASA device was sending out broadcasts but a reply never came. Instead I connected the device to my internal network where the ASA got an address instantly.
I read somewhere that if I was to use ?ip address dhcp client-id fastethernet 0″, then I got an address from the ISP.
I tried looking for a similar command on the ASA5505 but I couldn?t find anything. I did however find a page on the Cisco site confirming my suspicions. It said some ISP?s require the client-id field of the DHCPDISCOVER request to be filled.
I've also read that this issue has beed fixed since a few weeks, now they have released version 7.2(2).22 where you can define ?dhcp-client client-id interface outside? in global configuration mode. Im running 7.2(2).19 and i cannot find any command like that in my appaiance. How do i fix my problem ? Or how do i get about recieving the 7.2(2).22 firmware update.
Regards !
Leif

Hi again! I thought I should share the solution that worked for me. I use software version 7.2(2) on this device. ASDM 5.2(2). In ASDM open configuration / Interfaces. Click in outside (my case 0/0) and press Edit. Then open the tab Advanced and set the correct Active Mac address. Fore some reason its empty by default and the ISP/modem don't like that. You will find the correct MAC address under the help menu / "About ASA". Im sure there is some another way to do this but this is a simple "how-to" that works with Swedens biggest ISP and their standard DSL modem.
When I used a Linksys DSL modem in bridge mode without the MAC address set I got an inside IP adress (192.168.x.x) from the modem to the ASA. After setting the MAC address I just had to do a renew and got the outside address right away. /Bjorn
(future users searchwords: no ip from isp, ASA 5505 and cable modem).

Have to regularly restart DHCP Client - HP Pavilion 500-205 DT - Windows 7

HP Pavilion 500-205 DT - Windows 7 Home Premium 64-bit SP1
Realtek PCIe GBE Family Controller - Driver 7.67.1226.2012
Bought 3 identical machines for our childcare center. Set them up the same. All work fine except ONE of them becomes inaccessible periodically (daily more-or-less) to the other Windows computers on our little peer-to-peer LAN. You can see it, but cannot access any shared folder. There is NO problem accessing the OTHER computers on the LAN from this one. All 3 machines have the same sharing profile, workgroup, permissions, AV, firewall settings, everything. I realized restarting the computer in question solved the problem immediately but temporarily. I narrowed it down to restarting the DHCP Client service. Do that, everything works fine immediately but temporarily.
Things I tried:
Calling HP support - not helpful at all. It is under warranty.
Disabled IPv6
Disabled wireless
Disabled power-saving shutoff of network adapter
Setting DHCP CLIENT recovery to:
First Failure = Restart the the Service
Second Failure = Restart the the Service
Subsequent Failures = Restart the the Service
Reset Fail count After = 120
Restart Service after = 0
But again, this isn't happening to the other machines with default settings. Nothing works except restarting the DHCP Client service. The loss of access happens with or without someone logged or using it. It has happened since it was first set up.
I don't know if the HP warranty covers factory-loaded OS. I don't want to restore the thing and start over. I am not an IT professional, just the guy in the office who does these things, but it seems like the network adapter could be defective. I don't know if I can convince a first-level phone support person to have me bring the machine to an authorized service place.
Any help greatly appreciated,
Larry
This question was solved.
View Solution.

You're very welcome.
I would tend to agree, but I wanted to offer you that driver as a last resort.
This is a consumer to consumer forum. I don't work for HP, and if you suspect it is a hardware issue, you will need to contact HP technical support and submit a support case under the warranty.
The warranty covers hardware, and support for the HP software and operating system installed (as long as it is the original factory image that came with the PC and not an operating system you installed).

Sep 02 20:31:01 Severity:4 DHCP Client lease rejected from IPv4 router addr , MAC addr

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