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Questions tagged [dhcp-server]

Dynamic Host Configuration Protocol (DHCP)

The DHCP service is a client/server application that allows "clients" to obtain configuration information (typically for network settings) from a "server".

Questions carrying this tag should focus on the server-side more than the client-side.

562 questions
43
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4 answers

Rogue DHCP Server Can't be found

Over the last 3-4 weeks I have been trying to find a rogue DHCP server on my network but have been stumped! It is offering IP Addresses that do not work with my network, so any device that needs a Dynamic Address is getting one from the Rogue DHCP…
Dave Stuart
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29
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4 answers

How does a computer obtain an IP address via DHCP?

How does the computer know which device on the network to query? How does the default gateway factor into this? Pretty much, what is the chain of events that occurs when a computer tries to obtain an IP address using DHCP? The reason I ask is…
Bigbio2002
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22
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2 answers

What are the possible issues in using very short DHCP lease time (< 1min)?

We have a network setup for a demo, which lasts about 15mn. Our DHCP server is configured to assign ~ 100 addresses (max number of simultaneous connections or our AP) ... but since people might come and go very quickly we need to keep the lease time…
sebpiq
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15
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4 answers

Windows DHCP Server - get notification when a non-AD joined device gets an IP address

SCENARIO To simplify this down to it's easiest example: I have a Windows 2008 R2 standard DC with the DHCP server role. It hands out IPs via various IPv4 scopes, no problem there. WHAT I'D LIKE I would like a way to create a notification/eventlog…
TheCleaner
  • 33,047
14
votes
10 answers

Windows 2008 DHCP service fails - "...failed to see a directory server for authorization."

I have a small environment running Windows 2008 R2 where the DHCP service on the domain controller fails every two weeks. The most-visible error is Event ID 1059 and the Event Viewer message is: "The DHCP service failed to see a directory server…
ewwhite
  • 201,205
13
votes
4 answers

What does a DHCP-client consider to be the "best" answer?

We have training rooms where normally Windows XP is installed (via PXE). The "normal" DNS/DHCP infrastructure are Windows-Servers. The training room has its own VLAN (different from the Windows servers), so there is most propably an IP helper for…
Nils
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11
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4 answers

Force the DHCP server to renew the IP address of a client machine, without doing anything in client machine

I would like to know, if there is a way I could force the DHCP server to renew the IP address of a client machine instantly, without me going to the client machine? In fact, imagine, I don't have access to the client machine. So, here is my…
SSaikia_JtheRocker
  • 287
10
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3 answers

Why does a DHCP server need a static IP address?

I'm experimenting various network setups using VMs. When I setup the DHCP role on Windows Server, it requires a static IP. I am having trouble understanding why this is necessary from a technical point of view. My understanding of DHCP is, a client…
kevin
  • 266
8
votes
4 answers

What happens if the DHCP server comes online after the client devices do?

If I have a Windows PC running a DHCP server. I expect it will take on order of minutes a few to boot. My network will have a variety of other devices from various vendors that will boot within seconds. I have not found a "standard" for DHCP client…
Moby Disk
  • 196
8
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2 answers

dhcpd multiple domain-name-servers

I know it's possible to assign at least two DNS servers via DHCP. For example: option domain-name-servers 8.8.8.8, 4.2.2.2; But I wanted to know if I could also add a third DNS or if this would even make sense? My idea is to have a third DNS as a…
cookM
  • 183
7
votes
3 answers

dhcp server gives "no free leases" error although there should be available IPs

We have a small HPC cluster of about 40 machines running Rocks Linux Distro 6.2 (based on Centos 6.6). I have been trying to add 6 more machines to the system in the last few days. The first 3 were successfull but I can't pxe boot the other 3…
none
  • 75
6
votes
1 answer

Can the network still work when DNS & DHCP go offline?

In my LAN I have a Windows server and a Synology NAS for storage, directly attached to the server and provided as storage to the clients through a VM. The server provides the domain controller, the DNS server for the main VLAN and the DHCP server…
aardbol
  • 1,493
6
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2 answers

How to configure a MikroTik hAP ac lite router as a Layer 2 switch?

Here is an overview of the network topology: Both the Fritz!Box 7340 and MikroTik hAP ac lite router currently act as DHCP servers, effectively splitting the network in two LANs. The MikroTik router was also configured as a bridge for the…
Serge Stroobandt
  • 477
6
votes
1 answer

ISC DHCP Server "Dynamic and static leases present"

i have a problem similar to Fixed and dynamic IPs in ISC DHPD lead to double lease In my DHCP-Log I often receive warnings like Jan 21 10:20:56 dc2 dhcpd: Dynamic and static leases present for 192.168.1.107. Jan 21 10:20:56 dc2 dhcpd: Remove host…
user333163
  • 93
6
votes
0 answers

DHCP Server Not Offering to PXE Client

DHCP Server Not Offering to PXE Client BACKGROUND: I'm in the process of adding PXE services to an existing SCCM 2007 server. The SCCM server is separate from the DHCP server (Server 2008 x86) and did not have PXE services or WDS installed. I…
Colyn1337
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