Questions tagged [dhclient]

A simple Dynamic Host Configuration Protocol (DHCP) client to get IP addresses from a DHCP-Server.

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Run script on obtaining custom vendor option in Stateless DHCPv6 client

I am using Ubuntu and this question is regarding DHCPv6. After obtaining RA (router advertisement) with O-bit ("Other configuration" flag) set to 1, an information-request is sent by the client. ...
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Dhclient ignore all interfaces

dhcleint: Internet Systems Consortium DHCP Client 4.1-ESV-R12 dhclient shall request domain-name-servers, domain-name, host-name dhclient shall send fqdn.fqdn (A) dhclient should configure all ip ...
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Where is DHCP data stored on OpenBSD?

I'm currently testing with some DHCP and I'm wondering how I can verify if options like "option host-name" or "option domain-name-servers" really worked on the client machine (OBSD 6.6). Where does it ...
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How to make custom DNS servers show up in resolv.conf automatically after prepending DNS servers in Kali Linux?

I prepended DNS servers in dhclient.conf as such: prepend domain-name-servers 208.67.222.222, 1.1.1.1, 8.8.8.8; I restarted network using: $service network-manager restart So far so good but when ...
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Need to run dhclient for connecting to internet

I need to run these commands : sudo dhclient -r #refreshed ip sudo dhclient # restarted ip when i restart my LMDE 3 Cindy every time for connecting to internet. So i asked here why this must be ...
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132 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-...
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108 views

dhclient Active for Interfaces with BOOTPROTO=none

I'm facing a strange issue with my Linux bridge system (CentOS 7.6.1810). I have two interfaces configured with a bridged network (IP of the bridge is 192.168.42.253). When I reboot the system, it ...
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1answer
579 views

dhclient is not getting an lease / ip address from dhcp - but windows gets one

How could it be that I get easily an ip address with Windows 10 network manager and not with simple Linux QNAP NAS System? And not working situation. I tried to renew the ip address manually. [...
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2answers
610 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 ...
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51 views

How to set an IP from a specific range with dhcp?

I want to set a IP to my Debian machine using dhcp but I only want to select that IP from a specific range . For example, my net is 10.0.100.0/24 and the range has to be from 10.0.100.90 to 10.0.100....
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136 views

Why do I have to run dhclient on boot?

After a top-notch decision to blindly dist-upgrade, I have to run dhclient after every boot. I understand that I can fix this with a script on startup, but it bothers me that I have no idea what ...
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45 views

How to get DHCP info from DHCP Client to DHCP Server

I have a firewall with an Internet-facing ethernet, and a home LAN facing ethernet. The Internet-facing interface acquires DNS server ip addresses from the ISP's DHCP server. I would like to propagate ...
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1answer
331 views

Slow internet connection after MAC address spoof

I'd like to ask a question about spoofing MAC addresses. I'm trying it out in my own wifi network just to see how it's done. I'm running ubuntu 16.04 LTS. Let's say my original MAC address is 00:22:...
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1answer
382 views

Force run a dhclient script?

I'm seeking to prepend a local resolver into /etc/resolv.conf using a dhclient script at /etc/dhcp/dhclient.conf: prepend domain-name-servers 127.0.0.1; Is there a way for me to force dhclient to ...
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Beaglebone Debian/Wheezy. Static IP address some times is changed

I have Beaglebone Black with installation of Debian 7.11 Wheezy I have network which is created from Beaglebone and the Beaglebone IP address is set to be static: 192.168.20.1 This is my /etc/...
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Have to restart dhclient on enterprise network each time lease expires

I connect to a WPA2 enterprise network on Debian Jessie using Network Manager on dhclient. It works fine until the lease expires: Feb 04 15:52:31 arjun-thinkpad NetworkManager[26926]: <info> [...
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1answer
154 views

Where is current dhclient lease on RHEL7?

I cannot find any of dhclient.leaseon my RHEL7.4. There is no one in /var/lib/dhclient.
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624 views

Double entry in DHCP lease file

I noticed that my DHCP lease file (/var/lib/dhcp/dhclient.eth1.leases) has more than one entry for my external Internet-facing IP interface. Some of the lease entries have overlapping timeframe. I'm ...
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2answers
1k views

dhclient command does not allocate ip address to my interface

So I was trying to access a website through my browser but I couldn't. So I issued the ifconfig command to see if there was something wrong with the IP address I noticed that the interface enp0s3 ...
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1answer
367 views

DHCP DNS and Domain resolution NetworkManager

My environment is following, all cabled with gigalan, all latest Debian 9, vm with virtualbox on 2 different physical hosts. A mikrotik internet router which acts as DHCPD I configured it setting ...
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1answer
840 views

Why do I have so many /etc/resolv.conf.dhclient-new.xxxx files?

I don't understand why I have on one machine (debian 9) so many /etc/resolv.conf.dhclient-new.xxxx files my /etc/dhcp/dhclient.conf option rfc3442-classless-static-routes code 121 = array of ...
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3k views

Does openwrt have a dhcp client?

I was surprised that building a default open wrt config created an image without dhclient, After some digging we found odhcpd package for use as the dhcp server but I still can't find any package that ...
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1answer
2k views

Run dhclient on startup

I have this server that loses its network config on reboots, it's running Ubuntu Server 18.04, I tried the netplan commands but none generated a thing, maybe it's because the interface isn't even ...
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299 views

How to renew the IP with dhcp client if the AP changes the IP range without disassociate the clients

We are executing the dhclient for our Wi-Fi interface. When the Wi-Fi disassociates from the AP, we have a script that renews the IP automatically from the new AP: cat dhcpaction.sh #!/bin/sh ...
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1answer
540 views

dhclient does not work in opensuse 42.3, what's wrong?

On openSUSE 13.1 , dhclient eth0 works well, it re-request an IP address from DHCP server, which cost 1~2 seconds to finish. However, with openSUSE 42.3, dhclient always fails instantly. I don't know ...
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273 views

Supersede DNS at commandline (rather than directly editing /etc/dhcp/dhclient.conf)?

I know that I can use my chosen DNS by adding the following line to /etc/dhcp/dhclient.conf: $ supersede domain-name-servers 1.1.1.1, 1.0.0.1; I can verify that the correct DNS is being used as ...
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1answer
452 views

Automatically get IP address (DHCP) when plugging the ethernet cable in

I have a freshly installed system ; it's Raspbian (based on Debian), on a Raspberry PI, installed with raspbian-ua-netinst. I believe this is a general linux question, though feel free to redirect me ...
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176 views

Linux not running DHCP upon connecting to new VLAN

So I have autossh running on a Linux system, and it's configured to re-connect to my SSH server if it gets disconnected. I can confirm that this works by simply unplugging the NIC and plugging it back ...
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1answer
683 views

dhclient says it's bound to address - but ifconfig doesn't

I started dhclient with: syslog: ... Dec 27 03:26:03 HOST dhclient[13412]: DHCPDISCOVER on enp4s0 to 255.255.255.255 port 67 interval 3 (xid=0x859ef640) Dec 27 03:26:03 HOST dhclient[13435]: ...
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1answer
926 views

Creating multiple WiFi clients with a single wireless interface

I am currently working on a project where I would like to be using a single TP-link wireless adapter and split it into multiple clients. What I've done so far; I was able to create multiple virtual ...
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1answer
154 views

What exactly does `iwconfig wlan1 essid “myWifi”` do?

I'm working on an embedded device with a limited amount of programs for managing the network. I ended up using the command: iwconfig wlan1 essid "myWifi" key "s:password" At times this works but I ...
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1answer
3k views

How to avoid dhclient default gateway on an interface

Here is an issue I have stumbled uppon a couple of times and for which I still have no solution. I have a NetworkManager managed box with two interfaces. Let's call them eth0 and eth1. Both NEED to ...
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3answers
1k views

DHCP client fails to get IP address (Modem EM7430)

O/S: Raspberry Pi running Raspbian GNU/Linux 8 (jessie) Kernel: Linux 4.9.24-v7+ Ran ip addr and confirmed wwan0 and wwan1 interfaces are created. wwan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu ...
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1answer
1k views

Not getting dynamic IP address by dhclient on a virtual Fedora

I run a course that includes practical classes on system administration. For that years ago I created a Fedora 20 virtual image -- it need not be a modern and secure one as it is only for executing ...
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1answer
1k views

ISC DHCP client: Where is the dhclient.conf?

Problem: I want to change the timeout of dhclient for embedded Linux that doesn’t have DHCP. What I did: I have compiled DHCP from isc.org.  I have compiled it with this CFLAGS: CFLAGS="-...
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1answer
3k views

CentOS 7: dhclient.conf prepend domain-name-servers not working

I need to prepend my /etc/resolv.conf with an entry. My interface is enp0s3. So I created /etc/dhcp/dhclient-enp0s3.conf and added the line: prepend domain-name-servers 127.0.0.2 When I restart ...
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3answers
11k views

Dhclient not updating /etc/resolv.conf

On Linux Mint, when I view the /etc/resolv.conf file, the first comment states that the /etc/resolv.conf file is generated by resolvconf(8). ~ $ cat /etc/resolv.conf # Dynamic resolv.conf(5) file ...
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1answer
1k views

dhclient error “Bind socket to interface: No such device”

I experienced a strange error. If I tried to connect to the internet via WiFi, everything went well except the DHCP transaction. dhclient prints this error message Bind socket to interface: No such ...
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446 views

WLAN stick not working at boot time

I am failing to use a FRITZ!WLAN USB Stick N to connect my Raspberry Pi 1B to my wireless network. I see several problems, but am unable to locate and eliminate the root cause. The problem is ...
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2answers
13k views

how do you set up a linux client to use ntp information provided through dhcp?

there are so many tutorials out there explaining how to setup dhcpd server, in relation to providing ntp suggestions to dhcp clients, that I had always thought that ntp configuration was carried out ...
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761 views

dhclient logs flooded with useless information

I am using dhclient on Debian (isc-dhcp-client, isc-dhcp-common). The logs that dhclient is logging are flooded with copyright information and other useless stuff ("please consult README", "please ...
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1answer
2k views

dhclient - Applying configuration changes with no reboot

After editing some configurations on the dhclient configuration file (/etc/dhcp/dhclient.conf) the changes doesn't seem to have any effect until I reboot the machine. Since dhclient is running on the ...
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1answer
257 views

How do I remove delay in dhclient after DHCPNAK?

After moving to new AP, I restart dhclient to switch to the new network: DHCPREQUEST on <interface> to 255.255.255.255 port 67 DHCPNAK from <new router IP> <delay> DHCPDISCOVER on &...
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1answer
370 views

dhclient connecting to wlan0 after wpa-supplicant setup polls infinitely

I just wanted to try out how to connect to my WIFI WPA2 via terminal. Therefore I created "/etc/wpa_supplicant" network = { ssid = "nameOfWifi" psk = "passwordNumberThatIFoundOnTheWifiHardware" ...
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4answers
40k views

Check my DHCP lease?

Is there a way to show my current (client) DHCP lease? Or even better - retrieve all options/infos sent with DHCPACK?
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5answers
121k views

network.service Failed to start LSB: Bring up/down networking - Centos 7

I am experiencing an issue on Centos7 when attempting to start the network service. I receive the below error message. Failed to start LSB: Bring up/down networking The issue arised when I realised ...
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1answer
358 views

Raspbian Jessie: /etc/network/interfaces doesn't apply inet6 address. How to diagnose?

I'm experiencing a strange issue, and I don't really know how to diagnose it, or how to fix it. My problem is, that the static ipv6 assignment that used to work suddenly isn't applied any more at ...
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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 ...
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2answers
3k views

Tell dhclient to not use an interface

I have been reading through man dhclient and man dhclient.conf and cannot find a way to get it to ignore an interface. As in, pretend it does not exist. I do not want to shut any interface down. I ...
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2k views

How to disable a specific interface (dhclient) from resolvconf?

I am using ubuntu/trusty64 Vagrant box with VirtualBox. I want to permanently disable nameserver 10.0.2.3 set by resolvconf based on Vagrant's default eth0 interface. I have a network defined in my ...