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Questions tagged [dhcp]

DHCP stands for Dynamic Host Configuration Protocol and is an auto configuration protocol used on IP networks and an extension of the Bootstrap Protocol.

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), though there are many more possible configurations that can be sent out using the DHCP protocol.

More in-depth detail on DHCP and its implementation can be found at Wikipedia.

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Windows 2003 DNS updates from ISC DHCP server

We have a very mixed network, with most clients being Debian Lenny, the rest Windows XP/Vista/7. The network itself is split into two segments (for technical reasons) called "corporate" and "engineering". On the "corporate" side all clients get…
wolfgangsz
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Using DHCP to push SMTP server addresses to clients

I noticed on the Windows DHCP service there's an option to add SMTP servers to the information provided to DHCP clients. I've never heard of this before, but it sounds useful, especially for when our ISP's SMTP server experiences problems. How…
Kev
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Network booting from PXE

I need to use a network boot server. However, the DHCP Server is pointing to the wrong boot image filename and server. I can't change the DHCP Server itself, since that is controlled by another department. I just need to specify an IP for the PC to…
pypmannetjies
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Can I query DHCP server for getting mapping of MAC to IP address (I have admin rights)?

I need to know the MAC to IP address mapping stored on DHCP server. I don't want to use arp cache as that would require me to either broadcast ping (which is not allowed on windows) or ping the all possible ip address of subnet( which takes lot of…
Kazoom
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How do you keep track of which IP addresses are used on your network?

What tools are available for allocating and tracking which addresses are being used? Specifically, our issue is that sometimes an IP is taken for a VM and when we go to build new ones they're not necessarily up for the quick 'n dirty "ping…
Otto
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dhclient.conf: Send 2x host-names to the DHCP server?

Already working: Debian box DHCP with send host-name me.company.com in dhclient.conf DNS updates automatically with an entry for me.company.com What I want to add: Send a second host-name, so both are automatically registered with DNS In other…
RobM
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Is there a command to renew dhcp lease for ipmi?

I have updated config of my dhcp server, so that server should get a new ipmi address. But the server stay at its old address for some time. If I do not want to wait, I want to go to the server and force it to ask for the dhcp address. Is there a…
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Why aren't inherited scope options replicating between Win2019 DHCP servers in a failover config?

I have 2 Win 2019 DCs, both running DHCP servers with a scope configured for failover. If I explicitly set scope options on one, they properly replicate to the other server. But options inherited from the server options do not replicate (nor do…
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libvirt NAT configuration - DHCP does not work

I want to use libvirt network NAT configuration. libvirt says https://wiki.libvirt.org/page/Virtual_network_%22default%22_has_not_been_started: "1) If you're not actually using dnsmasq on the physical machine to serve DHCP for the physical network,…
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Windows 2003 RRAS keeps giving me a APIPA 169.x.x.x address

I've got a box running Windows 2003 Server at home. I have configured RRAS so I can VPN to my home network from an outside location. The home-LAN uses the 192.168.2.x IP-address range. Once I connected say, from my workplace, I could see (using…
haukurhaf
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Plug 10GbE appliance into the SFP+ port of a switch on a 1GbE network

Is this possible? Our setup: Core switching: Catalyst 2960-X 48 x 1GbE RJ-45 ports 2 x 10GbE SFP+ Uplinks between switches are RJ-45. We plan to get rid of these and use a 10G switch for switch-to-switch uplinks in the near future. Appliance:…
Brendan Lovett
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Debian/Ubuntu Linux: fixed IP when DHCP fails

I'm looking for a solution on this problem: I have this small industrial pc called UP Board, running some Linux Debian/Ubuntu adopted version: 4.10.0-9-upboard #11~16.04.1 SMP Wed Oct 25 17:10:46 IST 2017 x86_64 x86_64 x86_64 GNU/Linux (I believe…
okoester
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Is it possible to have name-resolution from Fortigate and local DNS server?

Can you advise on moving to a hybrid DNS? Currently, all our LAN machines receive their IP address from our Fortigate 60D (each machine is either allocated an IP address from the Fortigate DHCP, or has a static IP address set in the Fortigate). Our…
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DHCP conflicts on two Ubuntu 18.04 servers

I have two machines running Ubuntu 18.04 server edition. Networking go through netplan. They get their IPv4 from a DHCP server v6.3 running on Windows Server 2012 R2. For some reason, they don't provide their MAC address but a very long…
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Is it possible to have two DHCP servers

I have one DHCP server which provides the IP address to cleints. But for my testing i want that one other computer should act as DHCP server and give IPs to three virtual machines on that computer ,but in different range as the other server Is it…
John
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