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DHCP

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The Dynamic Host Configuration Protocol (DHCP) is an auto configuration protocol used on IP networks and an extension of the Bootstrap Protocol. DHCP allows for computers to be configured automatically to communicate with each other over an IP network without the need for manual setup by a network administrator. The implementation of DHCP relies on a DHCP server to hand out network configuration information to DHCP-capable clients that request an IP address (and other information required or useful in communicating with other devices on an IP network). In addition to an IP address, common configuration information served over DHCP includes a default gateway, subnet mask and DNS sever(s).

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I have all my scopes in a text file by their IP address. i can use set-dhcpserverv4optionvalue -computername "name" -scopeid "0.0.0.0" -optionid 6 -value 1.1.1.1

i have about 50 scopes i need to change and i want to point that scope to the text file to read and change all of the setting at once.
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Prepare for your VMware VCP6-DCV exam.
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Prepare for your VMware VCP6-DCV exam.

Josh Coen and Jason Langer have prepared the latest edition of VCP study guide. Both authors have been working in the IT field for more than a decade, and both hold VMware certifications. This 163-page guide covers all 10 of the exam blueprint sections.

We have a couple of Windows 2012 R2 domain controllers and two 2016 domain controllers.  the two 2012 boxes are running DHCP in HA mode.  I'd like to add the DHCP role to the two 2016 boxes and bring them into the HA cluster.  

Can you have more than two domain controllers in a DHCP HA cluster?

Thanks

Cliff
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My MDT sever which is also a DHCP .I renamed that server and since then Client are not gettign IP addres .
Server is 2012 R2 Standard.Any idea why  Clinets not getting IP address after getting server renamed ?
This server  is not attached to AD or DNS. it's an isolated server for imaging  to use MDT.
Thaks in Advance
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We are setting up a new site. From a AD\DNS and DHCP standpoint im trying to make sure everything is done.

-Setup DHCP scope
-Let our network team setup DHCP relays(we have a separate team who manages the network)
-Setup Sites(AD sites and services)
-create a DNS reverse lookup zone

Am I missing anything?
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Need to connect cable modem to 8-port POE switch but neither has DHCP Service, necessitating the possible need for a router. Need simple Plug&Play P&P.  Do not need WIFI, since this will be remotely located and wired to POE switch.  Effectively, I need a router w one WAN and one LAN port and with DHCP service.  This goes in a 24" high structured wiring panel.  The switch is a Netgear GS108PE 8-port POE Gigabit Smart Managed Plus Switch.
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Our DHCP server on SBS 2011 is not performing properly, on few workstations its not assigning the IP address, we have tried to reset the network card on workstations but they are able to obtain any IP and the workstation is set to public network for some reason, all was good earlier but this morning this suddenly happened to 3 of our workstations.

also on the workstation network adapter I saw its able to send data but receive is 0
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One of the companies I support has their SonicWALL firewall issuing the DHCP server addresses to the Windows 10 client computers.

I recently installed two physical Server 2016 servers and am now being told that it will be better to move the DHCP role from the firewall to the servers.

Some people have said that it is best to have the SonicWALL TZ600 router assign the DHCP addresses in case the Server 2016 servers go down.

The Server 2016 servers are only being used as domain controllers and for group policy for the Windows 10 client computers. The security settings are such that if the domain controller can't be reached the users can still logon to their Windows 10 computers. This organization has all of their files saved in the cloud and the servers aren't used to store anything.

The servers and network printers are all using static IP addresses.

What are the advantages & disadvantages of having the Server 2016 servers assign the  DHCP addresses instead of SonicWALL hardware  router?
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How can I determine if a Server 2016 DNS server is set to forward external IP address requests to public DNS servers on the internet?

An organization I consult for currently has these DNS server addresses assigned to client computers via DHCP:

10.10.10.20 (internal IP address of primary domain controller (PDC)
8.8.8.8 (secondary DNS server IP address)
8.8.4.4 (third DNS server IP)

I would like to change this DHCP DNS scope to be:

10.10.10.20 (internal IP address of primary domain controller (PDC)
10.10.10.25 (internal IP address of second Active Directory domain controller)
8.8.8.8 (third DNS server IP address)

This second set of DNS server addresses will provide better redundancy in case the primary domain controller (PDC) goes down.

But before doing this I want to test these two Server 2016 domain controller DNS servers to make sure that they will forward any external IP addresses to the public internet.

How can this type of testing or evaluation be done?
0
Hi
Can we configure ESW-540 switch as a DHCP server with it's own address pool? Have already reviewed the manual but it doesn't seem to have this functionality.
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Hello - we have a SuperScope on our 2008 R2 DGCP AD server, which runs DHCP for 2 subnets - 192.168.1.x and 192.168.5.x.  The respective VLANs for each subnet are VLAN2 & VLAN 6, respectively.  What we are seeing is the following scenario:

1) Computers that do not have a lease previously on the network (they have been off for several days) will be properly assigned a new lease on the 2nd subnet of 5.x on VLAN6, and work fine.  

2) Computers that have an active lease, however, on the 1st subnet of 1.x on VLAN2, will not receive a new IP on the 2nd subnet when they are in our neighboring building that has a WIFI network going thru a switch that is configured for VLAN6.  Cisco captured and inspected packets from test clients coming thru a VLAN6 port on the network, and see the DHCP Request is made by the client, and the DHCP server answers, but does not properly hand out a 5.x IP address - and the client ends up retaining the 1.x IP it had originally.  Even if we issue a "ipconfig /release" it does not help.  

3) If I hard-code a static address on the 5.x subnet, however, the client will connect properly.  

Is there something that is not configured correctly on the DHCP server to cause this?  I will attach a screenshot of our Superscope.  Let me know what else I can send that might help disagnose this.  

Thanks for your help!
Damian
DHCP-SuperScope.pdf
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Free Tool: ZipGrep
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Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Hello,

I am playing around with DHCP Snooping on a switch before I deploy the config out. I have a very simple lab. Router that provides DHCP to a switch with a host on it. I enabled DHCP snooping on my vlan and on the switch

IT_SWITCH#sh run | i snooping
ip dhcp snooping vlan 1
ip dhcp snooping

Open in new window


No trusted ports have been configured on any port even the trunk to the router so technically, I shouldn't get DHCP IP address to my host? Correct? If so, I am. Am I doing something wring? No trusted port was configured so I should not get dhcp
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Starting to learn a bit more about DHCP and I have a quick question.  If I setup an exclusion range of ip addresses do these addresses get removed from distribution AND use or just distribution?  I want to pull out 10 addresses for 10 wifi access points I am setting up.
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Hi,
 I got a Dlink router(192.168.10.1) in which i disbaled wifi.
then I got a TP-link Access point where wifi and ssid enabled.
I have connected Access point to router. setup dhcp in both access point and router. everything works fine. wifi works fine from AP getting ip in 192.168.10.1 range.

But i want to setup access point(192.168.20.1) in a different subnet to the router network(192.168.10.1).   how should i set it up to make it work ???

Hope my question is clear.

Thank you guys.
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We have a domain with a few laptops.  We have DHCP enabled on the DC.  We have tried to put in an Asus RT-AC88U and set it to access point mode.  It worked great for a few months but has stopped working intermittently.  When it stops working, we reboot it and then it starts working again.  Are there settings within the AP that need to be changed?  If so, what are they?  Either that or is there an access point out there that will do DHCP?  Android and Apple devices do not seem to fail.  It is just the Windows 7 laptops.  Any help would be appreciated.
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If I want to find out if a ip address is set to DHCP or staticl on a workstation Win7 - remotely.
I can ping and use tracert successfully.

What type of Windows tool can I use at a DOS prompt or CLI from my computer.
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I have a wireless modem/router which manages the main part of my network.  Its LAN IP is 192.168.1.1 and it is a DHCP server.

I have also connected a TP-Link C60 Wireless router via cable to the modem/router.

I am wanting to configure the TP-Link wireless router to give wireless access but then have the DHCP managed by the modem/router.

At the moment I have the TP-Link router getting a WAN IP of 192.168.1.200 from the modem, but then the TP-Link is issuing IPs to wireless clients in the 192.168.0.1 scope.

Does anyone know if I can get it to simply act as a wireless repeater for the modem rather than have its own DHCP scope?
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What are the steps to add IP address DHCP MAC address reservations to a SonicWALL TZ 600 router?
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A business client of mine has switched internet service providers and the new provider has installed a mikrotik rb2011il-in.

How do I configure DHCP options for Gateway, DNS using Webfig.  I cant find anything on the web about the task that is recent and from I can only assume is a hobby router
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2 x HP laptops Windows 10, unable to connect with Ethernet cable not able to get an address via DHCP. Setting a static IP address does not resolve the issue either.

This happened two months ago in which I was able to fix I'm suspecting Windows update keeps upsetting it
All the cable side of things have been tested I believe updating the BIOS fixed it last time.

Any thoughts or if you have experienced can you please share?

Im going back onsite now to see what else can be done so if you see this and know the answer if you could please share.

thankyou.
0
Free Tool: Subnet Calculator
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Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

We have a few thousand laptops they all seem to be working fine. I have one windows 10 laptop this morning that can connect to an ssid and gets an ip from DHCP but cannot do anything else.  It cant ping anything or connect to any websites.  I can connect the laptop to another ssid and am able to connect to the internet without issue. I deleted the DHCP entry for the computer and released and renewed the ip on the laptop but still has the same issue. I uninstalled and reinstalled the wifi card in device manager.  Any ideas on what I should do?
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I have 3 DNS servers. Each server is in its own subnet. It appears that the Primary DNS server is not deleting old records. We have duplicate IPs on one particular DNS server. I have scavenging turned on.  
Select the Enable automatic scavenging of stale records check box is checked. The Enable Aging and Scavenging for DNS  is checked. The other 2 DNS servers are removing old records.

Could the db be corrupt? Should I delete the duplicate records? That would be a time consuming task.

DLH
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Our DHCP servers host multiple scopes for ip address leasing.   I am not very familiar with the newer iterations of DHCP server 2008, 2012, etc.  I noticed that if I right click on a lease I can apply a deny filter to the device.   Does that filter only apply for that particular scope, or will it deny  access to DHCP lease entirely?
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One of my client computers is giving us difficulty when trying to RDP into it.  I can ping the machine & get a response, where I'm confused is the IP that's returned doesn't match the host name.  I ran ping -a to check this, which returned a host name that was joined to a domain that has been decommissioned for well over 4 years.  Ran nslookup of IP it returned the same odd host name joined to the current domain.  Then I ran nslookup using the odd host name it then returned the odd host name, joined to old domain.
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We have a Class C network and are running out of IP addresses.  We have multiple switches throughout our company and don't want to incur the expense of upgrading all of them to be VLAN capable.  In order to expand our addresses, is it possible to only upgrade one of our switches to a VLAN capable switch and configure it as follows:
1.) The DHCP server is plugged into one of its ports which is configured to be on the default VLAN.  
2.) Any other switch plugged into it will be plugged into a port configured to be on the default VLAN.  
3.) Any other device (printer, computer, etc.) plugged directly into it will be plugged into a port that is configured to be on a secondary VLAN.
4.)  The DHCP server is configured to hand out a different scope of addresses for devices on the secondary VLAN.
5.) The switch is configured so the VLAN's can communicate with each other.

Again, if all we need to do is expand out addresses, is it necessary that any of the other switches are VLAN capable?  Does anyone have a alternate, perhaps simpler way of expanding the addresses?  We could convert to a Class A or B network.  Please advise, and thanks in advance.
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Trying to narrow down issue with machines getting DHCP leases. Could be machine, or DHCP relays.

Is there a way to test the DHCP server itself to make sure its part is working correctly? I checked logs, and everything seems to be working fine but is there something like dcdiag that could verify? I dont manage the other parts, just the DHCP server itself so I have to make sure its working correctly. Thanks
0

DHCP

10K

Solutions

14K

Contributors

The Dynamic Host Configuration Protocol (DHCP) is an auto configuration protocol used on IP networks and an extension of the Bootstrap Protocol. DHCP allows for computers to be configured automatically to communicate with each other over an IP network without the need for manual setup by a network administrator. The implementation of DHCP relies on a DHCP server to hand out network configuration information to DHCP-capable clients that request an IP address (and other information required or useful in communicating with other devices on an IP network). In addition to an IP address, common configuration information served over DHCP includes a default gateway, subnet mask and DNS sever(s).