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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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Set Internet Access for VLAN + Default Gateway + DHCP Client

I have a question that make my mind so bussy. I would appreciate if anyone guide me about this. So let me explain: Firstly consider We have bellow devices: Devices: 2 L2 Managable Swiches 1 Router (act as unique Default Gatewayfor clients) 1…
Ali Fanaei
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Why does a DHCP4 client not respond to the DHCP Offer from a DHCP server?

An extremely simple DHCP server works reliably with Windows 10 PCs and Android devices. It receives DHCP Discover from a client, replies with DHCP Offer, then receives DHCP Request from a client. However, it does not work with a device using DHCP4.…
Hong
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What data is stored in DHCID RR by rfc 4701 (in lay terms)?

To understand what is going on my dhcp server I need to understand what is stored in this record that idenities my dhcp clients. I have long read this standart. But cannot understand. In lay terms I want to know what data relate to client is stored…
vskubriev
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Wireless devices are detecting DHCP/DNS but Wired are not

I set up a server hosting AD, DNS, and DHCP. My wireless devices are successfully contacting the server and receiving an IP address, but my wired devices are not connecting. I have 2 virtual servers and 1 virtual desktop using HyperV installed on…
bjurstrs
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Dhcp Classless Static Routes hook error

I have a dhcp server that hands network information to vms of mine. It works fine for centos6,7 , and debian 7 clients. However it fails for Debian 8 and Ubuntu 16.04 clients. For the ones where it does not work, it gets the lease without issue,…
awmusic12635
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DHCP renew fails with multiple subnets on same link

Our network currently consists of 3 subnets on the same link: 1.2.3.0/24 is the global subnet 10.1.0.0/16 is used for NAT (because there are far more than 200 clients) 192.168.0.0/16 is the "guest network" with a simple captive portal for unknown…
cbix
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Restricting Source IP of DDNS Updates

Goal: For a non-Microsoft DHCP server to send dynamic DNS updates on behalf of non-Microsoft domain clients. Question: With a particular zone in a Microsoft DNS server configured for "Nonsecure and secure" updates, can Microsoft limit which IP…
madhatter
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DHCP unable to deliver offers over routers

I have the following network: PCVLAN10 -> SWITCH_LAN1 -> ROUTER_LAN 1 -> ROUTER_LAN2 -> SWITCH_LAN2 -> DHCP(ROUTER) I have set up subinterfaces on the routers, and allowed trunking on VLAN 10 on all devies. What I want to achieve: PCVLAN10 should…
Whatcouldbewrong82
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How to get the connected wireless router's DHCP server not of another router's in the same network?

I have two internet connections and three separate wireless routers on the same network. The two dlink routers are serving one internet connection and the speedport the other internet connection. My problem is that when I connect to my first dlink…
obeliksz
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DHCP Configuration

Our network ran out of IP address on the current local subnet, so my boss requested our service provider to change our subnet from /24 to /20, it will give us more than enough IPs to assign to the devices. Currently there is a DHCP server setup on…
menora
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Identical DHCP leases, excessive dhcp traffic

Fresh install of CentOS 7, removed dnsmasq, installed dhcp server, iptables, webmin, apache. This is school and lot of switches and wifi (bridge mode) AP's connected to this router One network - 10.0.0.0 DHCP pool - 10.5.0.1 - 10.5.244.244 There is…
Matt Markevičius
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How to set up subnets for small business infrastructure

At one location we have a single server (also a DHCP server) and much less than 254 clients. Many are wired, but there are also a couple of wireless routers, which occasionally have their wired ports used too. Right now the wireless routers have…
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Possible to configure DHCP server to only hand out IP's to PXE clients

Is there a way when you are setting up a Red Hat DHCP server for PXE boot to ONLY hand out IPs to PXE clients? We already have a Windows DHCP server on the network (a server which we do not manage)and do not want this to conflict with it. I have…
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ISC DHCP Client keeps asking for address

All of a sudden the network at my University has frozen and we managed to isolate the problem to massive amounts of UDP packets sent on the DHCP ports. On closer inspection, we found that some of the clients keep spamming the server with DHCP…
rhobincu
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How to make a primary scope and secondary scope on DHCP server?

I am changing network structure and part of that is to change ip from 10.10.111.0 /24 to 172.16.0.0 /16 range. Now I need to have DHCP ready first in 172.16 range. I have two DHCP scope on a single DHCP server. 10.10.111.0 172.16.20.0 How can I make…
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