DHCP is an auto configuration protocol used on IP networks.

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DHCP server easy switch

i have a server, running Centos, that bring reserved DHCP for mac to 5 computers, but they have diferentes ip depending on some external parameters, and i change manually everytime, and i want know ...
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1answer
34 views

what is “rfc3442-classless-static-routes” in /etc/dhcp/dhclient.conf

I am trying to debug DHCP on my laptop (I am using dhcping and dhcdump to see what the DHCP server sends back). Following is my /etc/dhcp/dhclient.conf. option rfc3442-classless-static-routes code ...
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17 views

dhclient appears to give address but interface does not get assigned it

I am trying to connect to wifi using wpa_supplicant. I use this config: network={ ssid="guest" #psk="guest" psk=<numbers> } I also tried this config: update_config=1 network={ ...
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12 views

How to use “on commit” with isc-dhcp-server (IPV6)

I try to use the "on commit" trigger in isc-dhcp-server. I made prefix delegation, and I have problem with updadting routing table, so i want to use the isc dhcp triggers to manually update routing ...
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26 views

Stop DHCP from flooding network with available IP-addresses

I'm currently setting up a dhcp within a network with multiple other DHCP-servers (school) and lately I've received some complaints that my DHCP in particular keep flooding the network and spamming ...
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40 views

Problems forcing Debian to obtain IP from predetermined server address using DHCP from nameserver on network

I am having trouble getting my Debian server to change the address where it requests its IP address. I currently have two routers. My primary distributes IP addresses to various machines on the ...
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1answer
30 views

How to set and get DNS and DHCP servers addresses

On my openSUSE 13.2, I have a case to set and get DNS and server addresses. I managed to get the DNS address by parsing /etc/resolv.conf, my concern now is setting DNS and DHCP. Does changing the ...
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97 views

isc-dhcp-relay service doesn't work

192.168.2.1(dhcp server) -> (eth1 192.168.2.3)[ubuntu 14.04 dhcp relay server](eth0 192.168.1.1) -> Client isc-dhcp-relay successful installed, configuration file is #/etc/default/isc-dhcp-relay ...
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20 views

DHCP occasionally assigning IP address with hostapd

I am currently getting my internet from a building of mine two blocks from where I live. I usually use a wireless card to connect to the access point that has the internet..What I am trying to do is ...
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1answer
48 views

How to fix or bypass the DHCP handshake to get an IP address

My linux box can't seem to get a DHCPOFFER from my router. This is blocking me from getting internet access on the linux box. Here's the setup: I have two computers, a linux box called mocha and a ...
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2answers
88 views

How to automatically apply wpa_supplicant configuration?

To authenticate in a corporate network I have to run the following command: $ sudo wpa_supplicant -i eth0 -D wired -c /etc/wpa_supplicant/mywired.conf -B The configuration script loaded thereby ...
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46 views

How can I have hosts register their IPv6 addresses in Windows DNS

Windows clients support registering their IPv4 and IPv6 addresses in DNS after obtaining the address from a DHCP server or via IPv6 Router Advertisements. For my CentOS 7 and Fedora 21 boxes I'd like ...
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1answer
92 views

Debian stuck in Endless DHCPNAK/OFFER loop unless I ask DHCP server to clear expired leases

have a Marvel Kirkwood device running Debian with 3.16 Kernel. On boot, the DHCPClient gets stuck in a loop and never picks up an ip unless I log onto the dhcp server and ask it to dump the expired ...
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16 views

No DHCP OFFERS on several PCs in same network

I have different PCs and 2 of them don't get an IP-address (because they don't get a DHCP-offer) by the ISP, while the others do. I pluged them directly in my cable-modem, one after another. But when ...
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1answer
40 views

How can I have a bridge that uses DHCP?

I have set up a linux box (centos 7) to use for virtualizing some servers. I have set up a bridge, but I need to do it with DHCP, but it doesn't seem to like it. The reason I need DHCP is because ...
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1answer
416 views

Bridge does not get IP via DHCP at boot

I'm running CentOS 7. I'm not running NetworkManager, and I've actually uninstalled it. My system is supposed to acquire an IPv4 address via DHCP on br0 at boot. Howver, when I log in, it has no ...
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3answers
215 views

what is dhcpv6-client service in firewalld, and can i safely remove it?

In a CentOS 7 server, I type in firewall-cmd --list-all, and it gives me the following: public (default, active) interfaces: enp3s0 sources: services: dhcpv6-client https ssh ports: ...
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1answer
60 views

Auto-population of /etc/resolv.conf not working?

I am using Raspbian with a static setup in /etc/network/interfaces. I have read from multiple credible sources that the /etc/resolv.conf file is populated by other software on the system, commonly ...
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1answer
648 views

DHCP Kali Linux

I'm using VBox. I have got a Bridged Adapter. I need to get my network working. What I can already do is to set everything up manually, I mean: ifconfig eth0 192.168.1.33 netmask 255.255.255.0 route ...
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2answers
267 views

What overwrites /etc/resolv.conf on every boot?

I was given the files for a mini linux, that boots directly into firefox. It works for all it should be doing, only that I do not get an internet connection. We have 3 DNS servers in the network, ...
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2answers
666 views

Why can't I start isc-dhcp-server upon installation?

I'm following this tutorial to install Linux in a system that does not have CD reader nor USB boot capabilities. Eventually, I reached the point where I had to install isc-dhcp-server and I did, sort ...
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1answer
90 views

dhclient took minutes to get an IP

For some reason my mini-computer had no IP address, so I performed sudo ifdown eth2 followed by sudo ifup eth2. What followed was a 5 minute grudge match of my client fighting the server to see who ...
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1answer
237 views

Arch Linux: Should I keep the dhcpd service if I'm using connman?

Running systemd-analyze blame tells me that dhcpd.service is running. I remember enabling this in order to get automatic Ethernet connection back when I was installing Arch. Now I installed connman ...
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1answer
51 views

dhcpd does not allow filename option with a colon in it

For some reason, tftpboot does not work with a colon in filename parameter: group { filename "node7:linux/pxelinux.0"; host machine_7a { hardware ethernet 02:01:02:02:01:11; ...
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68 views

pptp and openvpn clients dhcp from server

I would like the following: Ubuntu server with PPTP server and OpenVPN server and a DHCP server Ubuntu clients all with the same PPTP username and OpenVPN client certificate. Client connects to ...
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1answer
418 views

How to force network to wait for DHCP with systemd-networkd?

I'm using systemd-networkd to configure my interfaces: [Match] Name=enp3s0 [Network] DHCP=v4 It works quite well except that at boot, some services are not waiting for DHCP to finish. For ...
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47 views

Testing DHCP range; multiple addresses per interface

I set up a DHCP server; I have a range defined, for ~1k hosts. Is there a way to test all the addresses? This is the first time I have a task like this and I would like to know what will happen when ...
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4answers
4k views

Docker + Bridges + DHCP

I have a lot of docker containers that I need addressable on the the same LAN as their hosts. Up until now, I have been achieving this by using setting up a bridge and manually assigning them IPs, and ...
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1answer
37 views

Is it possible to suggest an IP to my DHCP server for my client to use?

Is it possible for a DHCP client on Linux to suggest an IP to a DHCP server? I have no access to the DHCP server. I cannot use static networking, or DNS will not work. (DNS on my network is set up ...
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1answer
96 views

How to know DHCP options value on debian/ubuntu and other linux

How to know all DHCP options and values (on the client side, Linux Ubuntu / Debian / ArchLinux ) provided by the server. I need to pass non-standard option to the client by the DHCP option code ...
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88 views

How do you prevent a DHCP release during shutdown?

I am currently using Ubuntu 14.04, but expect this to be applicable for different distros. I would like to prevent a DHCP release during shutdown, and opt for either the lease to expire or for a DHCP ...
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2answers
587 views

Can ping Debian VM via IP but not via hostname

On my work's network, my new debian headless VM is not visible via its hostname. I'm using: Debian Jessie Virtualbox bridged adapter I can see other VMs on my machine from the headless VM, and I ...
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1answer
346 views

Wifi not working

I just dual-booted windows 7 with Debian 7, during the installation it said the wifi firmware was missing so I installed without an internet connection, after the installation I got my LAN cable to ...
3
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1answer
770 views

Specifying DNS settings to override those of DHCP

Every 6 months or so I cannot access the DNS on whatever router I'm using. usually have to add the nameserver by hand to the /etc/resolv.conf file. I've tried adding Google free DNS to the file and it ...
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1answer
447 views

Spoofing or removing DHCP client hostname in response to DHCP server

In linux, when my machine requests an IP address it also sends the hostname back to the DHCP server. How can I stop my machine from sending back this hostname? I use dhclient, possibly via ...
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69 views

ISC DHCP Server - A Client's Uplink Is Not Working

Running a DHCP server, client(s) does not have up-link (0Mbps) and has a downlink (50Mbps.) I am setting up a gateway/router on a PC running Debian Wheezy with ISC-DHCP. I have 1 WAN (eth0) and 2 LAN ...
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154 views

why is dhcpd listening on udp port 38053 and udp6 port 40572?

I am running a dhcp server with dhcpd from isc and thought it should only be listening on port 67. Why is it also listening on those other ports? I cannot seem to find what those ports are for, but ...
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1answer
98 views

DDNS (dynamic-dns) setup and adding a hostname to a device (to be visible on the network)

How do I provide a fixed Hostname to my device so that a netscan can shows up the device name across all platforms? How can I reach the device using the hostname/MAC-ID (something which is fixed) ...
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1answer
1k views

Pxeboot: Client not getting ip address from the DHCP Server

I am Working on Pxeboot. I have a Ubuntu system as KVM and in that system I installed Virtual machine manager. I also installed Ubuntu in the virtual machine. Before I start my virtual machine, I ...
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1answer
412 views

Setting up a gateway between two subnets on the same physical network

I need to configure a DHCP-enabled network (192.168.2.) on a physical layer where resides an already existing network (192.168.1.) with static IPs. I have a Debian 7 server with two interfaces (server ...
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1answer
10k views

How to auto generate resolv.conf on Centos 6.5

I just installed CentOS 6.5 and configured the following files: /etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE=eth0 HWADDR=aa:bb:dd:dd:ee:ff TYPE=Ethernet UUID=adfddfaf-9sda-adse-dfs4-asdfsdfdfg97 ...
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34 views

Why do I get “authentication” errors on this “Open” configuration?

I have the following ifcfg-wlan0 file: DEVICE=wlan0 BOOTPROTO=none ONBOOT=yes IPADDR=192.168.5.1 NETMASK=255.255.255.0 NETWORK=192.168.5.0 NAME=wlan0 USERCTL=no the following dhcpd.conf file: ...
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72 views

DHCP Problems Virtualbox

I have some minor issues with Ubuntu server on a virtual machine and even though I have some assumptions as to what actually happens, I'd like to ask all of you about your opinion. Here's the deal: I ...
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98 views

Use eth0 and eth1 for different subnets and assigned host name to interface?

I have a machine running SELES 10 with dual NIC Both the NICs are on separate subnets. The server uses a DHCP. So when one interface, eth0, gets the IP from DHCP and registers with DNS and then the ...
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1answer
44 views

Creating a virtual interface to always access a DHCPed interface with the same ip

I have an interface that on connect always gets a new IP. So I want to create a virtual interface with a static IP that "relays" everything over the physical interface. This would be useful to bind ...
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2answers
314 views

How to send an alert if the DHCP range exceeds using shell script?

I've install and configure DHCP server on CentOS 6.5. I've also added a subnet to the dhcpd.conf file as follows: subnet 192.168.1.0 netmask 255.255.255.0 { option domain-name-servers 192.168.1.2, ...
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1answer
427 views

dhcp: way to check the online status of the device

On Linux there is the file /var/lib/dhcpd/dhcpd.leases. I need to determine, for the devices for which information contained in this file, whether the device is online at a given moment. Is there any ...
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3answers
1k views

DHCP server not responding to requests from KVM guest

I've setup a DHCP server on my Debian server (Proxmox) so that I can provision IPs to my KVM guests on the server automatically. For some reason the DHCP server (isc-dhcp-server) isn't responding to ...
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2answers
298 views

dhcp query to get IP by MAC

I am using CentOS 6.5 and Internet Systems Consortium DHCP Server 4.1.1-P1 I found this file /var/lib/dhcpd/dhcpd.leases but not simple to parse it in bash is there any way to get the online clients ...
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139 views

Debian server doesn't show in DHCP list on router

I have a Raspberry Pi running Raspbian which is connected over ethernet to my router. The router has been running both with DCHP and Static IP addresses and over the local LAN I can connect fine over ...