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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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Remote traffic capture probe

Background: I'm a sysadmin at a relatively large university (about 15,000 users in residential space/ResNet). While my group is responsible for administering ResNet space (authentication, DHCP, etc.) the actual network devices are owned and run by…
Jason Antman
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Why would a DNS server issue affect only one corner of a building?

I got a complaint today from an end user whose internet was extremely slow only inside his office. Every other location in the building was fine, and the signal strength was very high even inside the affected office. I was thinking this had to be…
666adminpal
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Ubuntu Server 15.04 as Router and DHCP Server with multiple subnets

at my company i got assigned to build a new network, where 1 ubuntu server manages DHCP for 3 subnets, allows communication of these subnets between each other and shares the connection to the public to the subnets. All that just over 1 networkcard.…
KiSS
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no default gateway on interface that is set up with DHCP on CentOS7

I am using CentOS7 with multiple interfaces (ens161, ens192, ens224, ens256). The box has all static IP's with the exception of one interface that is set up to DHCP (ens192). ens192 is set up as onboot=no. I have a static route set in…
Dovid Bender
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Bridged VirtualBox VM with individual IP

On Debian hosts I run VirtualBox VM mainly to run WinX software. Some of these VM shall join AD and as such need fixed IP and shall be reachable from the LAN, i.e. NAT is no option. I considered bridged networking to do the trick, but it turned out…
Lars Hanke
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Configuring wireless network with multiple AP's

I have my primary router running ubuntu, which has been working fine for my basically very tiny large-scale setup (if that makes any sense at all). I got a handful of extra soho routers which I decided I would setup near a couple of wired…
Alex S
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Pinging DHCP clients by name

The office has a small LAN, composed by a Linksys WRT54G2 sharing a DSL connection, a hub, and several wired and wireless clients. DHCP is enabled in the Linksys. The DHCP clients table shows the connected machines, some with host name, but I can't…
ggambett
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dhclient: No broadcast interfaces found, but eth0 is up and broadcast

I'm experiencing a common problem with dhclient. But I wasn't able to find a clear solution to this problem. System: ReadyNas RN104 Stock Debian for armhf Just upgraded to Debian Jessie Self-built monolithic (ie. no modules) Kernel 4.0.5 If I…
JPT
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Why are DHCP request and acknowledgment messages broadcasted and not unicasted?

In 'Request' part of the DORA process, IP and MAC address of the DHCP server is known to the client (as the IP datagram sent in Offer has this information). So if the destination is known, why is the request still broadcasted to every machine on the…
Paras Gera
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Why is my DHCP pool not working?

I'm trying to create a configuration and it's doing most of what I want it to do, but the DHCP pool isn't assigning addresses. Here's the config so far: enable config t hostname xxxxxx enable password xxxxxxx enable password secret xxxxxx service…
ParanoidPenguin
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Using the VLAN of a bridged switch

In our building, we have 2, 6509 core switches, one for our company, and one for another. We have a vlan configured with a /30 which bridges the 2 switches. Both of us are on separate /16 networks. I have various /22 vlans configured within this…
joerockt
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request ip from dhcp

I'm automating a deployment on a vmware esxi host using some custom shell scripts and I would need to know in advance the IP this VM is going to get from a DHCP prior to it being installed. I know the MAC address in before hand. Is it possible to…
CaseyJones
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What happens when "Auto state switchover interval" is less than "Maximum client lead time" in DHCP?

I was wondering what happens when "Auto state switchover interval" is less than "Maximum client lead time" in DHCP? The question was raised after reading definitions of MCLT & ASSI: Maximum Client Lead Time: This determines two three things: A)…
Sam
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is it possible to use cobbler using windows dhcp server or without dhcp?

I want to configure cobbler in my network but my network already managing by a windows 2k8r2 dhcp server. Is it any way to configure without dhcp server ?
user1812956
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Setting up stateful DHCPv6 on Linux

I want to set up a DHCP server on my local network for IPv6 that issues addresses and further information like DNS/NTP and so on. From my ISP I got the IPv6 Prefix which I will refer to as in further snippets. I use the isc-dhcp-server.…
fragwürdig
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