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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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Network is DHCP - Can I manually set an IP to a device?

So as of right now, our SonicWall controls DHCP leasing. We have a bunch of network objects that really need to remain static (I plan on converting the network to static later), but I need a fix in the meantime. Since SonicWall does not have the…
Jonas Lear
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DHCP Server Offers, But Client Doesn't Accept

I currently have a development node that runs KVM virtualized VMs. There is a DHCP server running on the node to provide addresses to the VMs. I had DHCP working previously, but I reinstalled one of the client VMs to test some things and after…
awmusic12635
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Using dhclient or dhcpcd to assign address for alias interface

I have a Linux machine with one Ethernet interface eth0 which already has one primary static address and one secondary static address (eth0:1) assigned. I would like to use DHCP to dynamically assign a third address to eth0:2. This is an old…
Steve Summit
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dd-wrt DHCP forwarder is not working

all. I have a network which a Windows server is running RRAS(192.168.6.1) and another Windows server is running DC,DNS,DHCP server (192.168.6.2). I added a dd-wrt flashed router. The client connects to VPN router need to communicate to the server…
CK Tan
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DHCP based Server not updating A record

We have Citrix Servers which get IP from DHCP. After scheduled reboots, some Citrix servers are not pingable via hostname. nslookup is not able to resolve the hostname. OS: Windows 2008 R2 Citrix Xenapp 6.5
Asrar
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Nova network DHCP not releasing ip with force_dhcp_release=True

The problem I am seeing is that when nova-network calls dhcprelease upon instance termination (due to forcedhcp_release=True) the address is not always released(syslog are not showing DHCPRELEASE request). Then later on if nova assigned a new…
Yugendra
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How to change broadcast-flag in Windows or Linux?

As we know there are 4 types of packets involved when a client wants to get an IPv4 address from DHCP Server. These can be seen in the image bellow (from Microsoft web site). From the perspective of data link layer (Layer 2 of OSI model) frames…
AKJ88
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Intel AMT and host get different IP addresses via DHCP. How to fix?

I have a server that's recently been crashing occasionally in odd ways, so I decided to configure up Intel AMT on it in the hope of being able to reset it remotely when this happens. For better or for worse, in the current set up, this server has a…
arcticmac
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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…
ggambetta
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