Questions tagged [dhcp]

DHCP is an auto configuration protocol used on IP networks.

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24
votes
8answers
95k 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, ...
3
votes
3answers
2k views

Method for acting on IP address change from the ISP?

I have a Debian server at home. The server is my router and provides VPN access to the outside. I do not have a static IP address; the lease time given by the ISP is two hours. This cable cell which ...
7
votes
4answers
8k views

All commands that should be used to connect to wifi in command line

I would like to switch from gnome to awesome and I would like to connect my wifi network in command line (instead of using gnome tools). So, I searched on the internet and found approximatively the ...
2
votes
1answer
5k 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 ...
13
votes
7answers
17k views

“aborting authentication by local choice (Reason: 3=DEAUTH_LEAVING)” when trying to connect to wifi

I installed Debian 9 stretch (GNOME desktop) 64-bit on my PC. My USB wireless adapter (TP-LINK TL-WN722N) was detected automatically after installing atheros firmware: apt-get install firmware-...
15
votes
2answers
1k views

Host name changed remotely by wifi?

Am am currently visiting TU Wien and today I connected my Debian Linux laptop to their eduroam wlan using wpa_supplicant and the credentials of my home institute - as always when I am visiting another ...
6
votes
9answers
20k views

File /etc/resolv.conf deleted on every reboot, why or what?

I am having an issue where DHCP (I though as I read in other similar topics) is clearing the /etc/resolv.conf file on each boot. I am not sure about how to deal with this since the post I have found (...
3
votes
2answers
465 views

Debian workaround 838871: dhcp network configuration without blocking boot process

Is there a workaround for Debian Bug #838871? Problem: I want to have a network configuration on Debian with the following properties: Automatically ifup network interface when a cable is plugged in ...
5
votes
3answers
4k views

How to stop dhclient from updating resolvconf on Debian?

I want to use certain DNS servers regardless of whatever I get through DHCP. I'm trying to configure dhclient to ignore those, but I can't seem to get it to work. Per advice from this article I added ...
1
vote
1answer
2k views

How can I use ISC KEA DHCP (DHCPv4) server to push routes to clients?

QUESTION: I have an infrastructure with 5 servers (Server #1, #2, #3, #4 and #5). I am trying to use a server (Server #5) with ISC KEA DHCP (DHCPv4) ( https://kea.isc.org/wiki ) to push routes to ...
21
votes
6answers
159k views

Command to list assigned dhcp addresses

Is there a command I can use to ask the dhcpd server which addresses have been assigned?
11
votes
3answers
21k views

Location of dhclient.conf

I need to check the client DHCP settings, which I expect to be in the file /etc/dhcp/dhclient.conf, but there is no such files there. What is the location of this file in RHEL 6, on 64 bit?
8
votes
2answers
88k views

Setup static IP in redhat 6

I installed Redhat 6 x86_64. I am using the Network connection screen to set a static IP address like below (I want two PC's in my house to see each other: one Redhat PC and one Mac) 192.168.0.5 ...
3
votes
2answers
2k views

CentOS 7 DHCP Client - How to use “classless-static-routes” (“code 121”)?

According to this answer... https://unix.stackexchange.com/a/457577/61742 ... I can use the following configuration to use pushed routes from my DHCP server in my DHCP client by placing in the /etc/...
2
votes
1answer
2k views

Use dnsmasq to pushing routes to my clients on a small local network

I'm trying to use dnsmasq to pushing routes to my clients on a small local network. However my clients (Server #1, #2 and #3) can not use these routes. The dnsmasq service is running and I do not ...
31
votes
7answers
85k views

Why are my two virtual machines getting the same IP address?

I have two virtual machines both running on a Linux host (Fedora 16). I set both adapters as attached to NAT. When I boot them up they both have their default gateway set to 10.0.2.2. They also ...
13
votes
4answers
23k 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 ...
7
votes
2answers
6k views

Why are my cloned linux VMs fighting for the same IP

I've cloned two vSphere VMs off of an Ubuntu 17.10 template. After boot, they both claim the same IP and fight for it (ssh connections break off as the IP switches between them). The hostnames and ...
13
votes
2answers
85k 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 ...
7
votes
2answers
2k views

Strip specific option from a response in dhclient

I aim to prohibit dhclient from updating my NTP config with servers received via DHCP, as it is the default on Debian/Ubuntu. However, my DHCP server ignores the list of requested options (from the ...
7
votes
1answer
6k views

avahi-daemon withdraws IP address from my network interface

I am running an Arch Linux server in my local network. It has avahi-daemon running on it to advertise some services (like a print server). It has happened for the second time now that my server was ...
5
votes
1answer
2k views

systemd-networkd default static address if dhcp fails

Is there a way to configure the systemd-networkd.service to automatically switch over to a static IP configuration if a DHCP server is not present? Or if systemd-networkd doesn't support this ...
4
votes
1answer
9k views

DHCP server: offer different subnet addresses for different interfaces

I'm running Ubuntu 10.04 on my home router which has multiple network interfaces. I have dhcpd configured to provide addresses from 192.168.1.0/24 subnet on certain interface. However, I'd like to ...
11
votes
2answers
32k views

DHCPD ignoring my subnet declaration

eth0, my internal interface, has a static address of 10.0.0.1. I also have an interface, p4p1, acting as my external interface. If it matters, my external interface is not physically connected and ...
6
votes
2answers
2k views

Prevent dhcpcd from setting hostname

How to prevent dhcpcd from setting hostname got from server? Change of it breaks a lot of things (including X session). My current distribution is Gentoo, init system is systemd and dhcpcd is spawn ...
2
votes
1answer
2k views

Network fail on FreeBSD: Ping to router fails, but router believes computer is connected

I have a TP-Link TL-WN851N wireless adapter, which is based on an Atheros device. When I attempt to connect to my WPA2 wireless network, ifconfig wlan0 tells me that the connection is 'associated'. My ...
16
votes
2answers
43k views

Renew IP with dhclient on different interfaces

I have two interfaces on my computer, eth0 and eth1. Both subnets have a DHCP server on them. How could I use dhclient to renew IP address for both interfaces? If I do: dhclient -r && ...
6
votes
3answers
4k 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 ...
4
votes
3answers
2k views

Can I set my Debian box to use OpenDNS nameservers if it uses DHCP?

I have a Debian box with this in /etc/network/interfaces: auto eth0 allow-hotplug eth0 iface eth0 inet dhcp auto wlan0 iface wlan0 inet dhcp wpa-ssid NetworkName wpa-psk NetworkPass and ...
3
votes
2answers
3k views

PXE boot chaining to hardcoded TFTP server?

My existing network environment provides the following: DHCP server that sends PXE clients to a particular TFTP server TFTP server with SYSLINUX "pxelinux.0" file for booting The SYSLINUX ...
3
votes
1answer
4k 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 ...
2
votes
1answer
325 views

How to configure DHCP so that hostname is not sent?

A simialr question Host name on terminal changes when I connect internet : why? But since it was not resolved in my case so I am putting it here and asking in a different way. The answer given here ...
2
votes
0answers
759 views

No IP for USB 3G modem Huawei E3131 using modemmanager

I am trying to use a Huawei E3131 USB 3G modem on a Raspberry Pi system using raspbian (Debian 8) and modemmanager. I have two of those modems, and while they look the same, to the system they seem ...
2
votes
0answers
861 views

Booting over the LAN using uboot

I am trying to boot my beaglebone over the LAN. I am able to download the Kernel uImage from the TFTP server. Here is what I did - U-Boot SPL 2011.09-00053-gb423c52 (Aug 10 2012 - 11:26:55) Texas ...
2
votes
2answers
595 views

Working DNS-DHCP combo for LAN

Can anyone recommend a working DNS-DHCP combo for a small mixed-platform LAN? Preferably one where hosts can be assigned IP addresses and/or names with a web-GUI. The typical DHCP package on Linux ...
1
vote
1answer
65 views

ssh, trust hosts on fingerprint basis only, regardless of IP

In ssh configuration directory, the file known_hosts stores for each server the (IP, fingerprint) couple. A server is trusted only if it matches both the elements of one of the couples in known_hosts. ...
1
vote
1answer
343 views

exclude local addresses in wpad

I have a proxy Ubuntu 18.04, with squid 3128 and apache2, and I publish the auto configuration file proxy.pac with the option dhcp 252. The file has the following contents: function FindProxyForURL(...
1
vote
1answer
515 views

Problems setting up Ubuntu Machine as a router

I have been at this for over 24 hours, here is what I have so far. I have an Ubuntu Server running version 14.04.2.amd64, called SV-01 SV-01 has two NICs. ETH1 is for the external network (goes to a ...
1
vote
1answer
2k views

How can I resolve local IPs to hostnames? [duplicate]

Possible Duplicate: How to make a machine accessible from the LAN using its hostname I have is a simple home network with a few machines connecting through DHCP. If everyone and their respective ...
0
votes
1answer
118 views

dhclient OPENSSL_1_1_1

My dhcp client because some openssl version mismatch. Here is an error: debian:~$ sudo dhclient dhclient: /usr/local/lib/libcrypto.so.1.1: version `OPENSSL_1_1_1' not found (required by /lib/x86_64-...
0
votes
1answer
372 views

Problem with Wpad file in Mozilla Firefox

I have this wpad.pac function FindProxyForURL(url, host) { if (isPlainHostName(host) || shExpMatch(host, "*.local") || isInNet(dnsResolve(host), "192.168.0.0", "255.255.255.0") || isInNet(...