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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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Loss of DHCP following Windows Update reboot

We have two VMware virtualised DCs which have just undergone a scheduled Windows Update round and reboot. The secondary DC completed with no problems but the primary failed to reboot and ultimately the VM had to be rebuilt using the virtual hard…
Rich M
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Should I be able to see duplicate packets on both of these interfaces?

I have a Debian based DHCP server, with network interfaces configured for each VLAN in our network (vlan10_), as well as an interface on the network without VLAN (eth0). 2: eth0: mtu 1496 qdisc mq state UP group…
user284692
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DHCP server(s) IP allocation based on device type

In my study lab, I connect my pc to an Ethernet port wall socket and get a following IP allocation 192.168.1.X/24 Gateway: 192.168.1.1 but if I connect a standalone rogue wifi router's wan port to the same socket I get a different IP network…
Umer
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Using two routers

I've set up a camera system with all the cameras hardwired to a router. When I plug the router into the clients regular network, the dhcp from the two routers cross over and create problems. The client network is 192.168.1xxx. The camera network is…
Jeffrey Bowles
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How can I configure DHCP server to issue the same fixed-address by matching with the client identifier in the discover message

I am able to config fixed ip address with hardware ethernet options, but i am trying to assign fixed ip based on client id(option 61) from DISCOVER message. I tried with below configs , but it doesn't help. host virtual_1 { …
user1290
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Why isn't RDNSS working on Windows 10 post Creators Update

I have configured RDNSS on my router with an IPv6 DNS Server, however windows is not receiving this, I am not running DHCPv6 and only running DHCPv4, why am I not receiving DNS? According to This Article it should be supported.
Jacob Evans
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IP Helper address on same VLAN with Cisco

Is it a good habit to use a ip helper address on Cisco, or any similar ip helper, when the DHCP is on the same subnet as the client/server.
Tolsadus
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DHCP Router DNS Entries with Domain Controller

I've set first DNS value in my router to the Domain Controller's IP yet i'm unsure if i need to set say the ISP's DNS in the second entry or just point to the Domain Controller only. Thanks for your help
SarvenAtam
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Windows Server: How to configure DNS forwarders on a circuit with a dynamic IP address

Here's the issue: Your connection to the internet is over a cheap circuit that doesn't provide a static IP address or public static DNS servers. Your LAN is NATed behind a firewall appliance. You want to set up Active Directory and accordingly need…
Rhett
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DHCP relay handling multiple subnets

So I have a problem for which I don't think there is a direct solution. I have two separate [physical] networks, on two different interfaces of the same router. Each network has two subnets on it, one is public, one is in the RFC1918 private…
ereisch
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dhclient intercepting outbound packets

I have a service listening on a UDP port on an ubuntu machine on AWS. Another machine I have no control over is sending packets to this service, however the source port for these packets is set to 68. When my service wants to respond to these…
Slicedpan
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Does a DHCP client is expected to send DHCP request unicast to the Server in the event of a Unplug/replug or eth0 down and up?

I would like to understand if the DHCP client running in our embedded device is expected to send DHCP request unicasted to the server in the following events? Eth0 goes down and comes back online Physically Unplugging the ethernet cable. As per a…
Renold Singh
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Option 81 in DHCP

Just curious about this. When we enable option 81 on a DHCP network, the DHCP server will start updating the zone that comes along with the client's FQDN. Now, how would client will ever know its domain even before getting an IP address? My…
Vignesh SP
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DHCP server problems with static IP clients

lately I've been having some problems with my DHCP and my clients IP. So basically, in my netwrok I have a DHCP server (Windows 2012 R2) which is working fine (when you connect to the network you get an IP, and you have connectivity), and then I…
bernat123
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One Server Occasionally Takes Down Network/DHCP. How to Diagnose?

We've got an Ubuntu 16.04.3 LTS machine plugged into our network that occasionally needs to automatically reboot itself. About 25% of the time, when it does this, it takes down the entire network. Both ethernet and wifi connections stop…
dave mankoff
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