DHCP stands for Dynamic Host Configuration Protocol, and is commonly used to configure network devices so they can communicate with one another. Typically you’ll have a DHCP server (like a wireless router), and client machines on the local network (like a Mac, iPhone, PC, etc) that pull a dynamically assigned local IP address from that server. Having two DHCP servers battle it out on your network is a bad idea. You will get inconsistent results. Consider the VLAN option but coupled with a RADIUS server on your switch such that your Macs can change VLAN based on what you are doing. May 02, 2008 Hi Guys, On Windows clients we can setup Dhcp class id, so that a particular range of ip's are addressed to those clients. Is is possible to assign such dhcp class id to Mac os X? Cause currently i have to assign static ips to my mac user [one of them being my MD]. But I am specifically asking how to force a new DHCP IP from client side without rebooting, if such a thing is possible with DHCP at all. Alternatively, if someone can confirm that DHCP does not support client wanting an IP address change, preferably with a reference, that would be valid answer, too. Hi Christian. Here it is from the client side. I try two unknown MAC, the one we want static and a final unknown. You can see it working through the DHCP dynamic pool and the assign the static and then back to the dynamic.
Active1 year, 4 months ago
I'm troubleshooting a certain issue with my DHCP configuration, and need my Windows machine to ask for a 'fresh' IP address, so I can see which address DHCP server gives by default.
When I do
ipconfig /release followed by ipconfig /renew , Windows 'proposes' its old IP address to the DHCP server (just checked with Wireshark, initial 'DHCP Discover' message has Option-50 (requested IP address) with Windows machine's old IP).
Tried disabling/enabling network adapter. Same behavior.
Question: How can I force Windows to just ask for a new IP address, without proposing its old IP address.
haimghaimg
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8 Answers
There is no procedure worth the effort. It's stored in a registry key, but that portion of the registry is cached while the network subsystem is running. So you'd have to shut the system down, boot another OS installation, mount the registry, delete the key, and then reboot into the original OS installation. The key is DhcpIPAddress but it is only used across reboots, so you can't modify it.
Uninstalling and re-installing the network adapter might work.
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Running
net stop dhcp and then net start dhcp appears to work on my Windows 7 test system. The resulting DHCP discover packet does not include Option 50.
I guess it's your choice if you want run
ipconfig /release first in order to signal to the DHCP server that the IP address is available (it should remove the existing lease on the DHCP server).
So, to summarize, the whole process would be (in an Administrator cmd window):
If you wanted to indicate only a connection matching Anaksunaman
Local* (for example, Local Area Connection), then you could do: https://turboshirts.weebly.com/blog/best-mail-client-for-mac-and-ipad.
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MichaelMichael
Mac Asking For Dhcp Client Id Change Ip Address
If your Ethernet driver supports it, you could change the MAC address on the NIC. It's usually a relatively painless procedure. Then Peter Mortensen
ipconfig /renew should give you a new IP address.
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KeltariKeltari
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I found this solution here.
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j8048188j8048188
You could try configuring the DHCP server to give out addresses in a range that excludes the old address. Eg, if the old address is x.x.x.101, set the range to be x.x.x.120 to 130.I know you're interested in determining some default behavior of the server, so this may not be helpful if it alters the very thing you want to determine.
maxwmaxw
Step 1. Write down the IP address that you want to get rid of on the client:
Step 2. On the second computer, temporarily assign a manual IP address you wrote down in step 1.On the first computer where you are trying to change the DHCP reservation:
Step 3. The first computer will now get the next IP address that DHCP will offer.Remove the static address on the secondary machine by switching back to the DHCP setting.
Peter Mortensen
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DmitryDmitry
I've just found a workaround. It does require changing the DHCP server configuration however:
Joachim SauerJoachim Sauer
Dhcp Client Id At&t
The easiest way I found to force resting the IP, is to assign same DHCP IP to another PC as static IP, below are the steps:
It can be done by using Ethernet and WIFI adapters as well instead of using two PCs.
Wael DalloulWael Dalloul
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protected by Community♦May 20 '15 at 23:30How To View Dhcp Client List
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