Questions tagged [dhcp]

DHCP is an auto configuration protocol used on IP networks.

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How to verify static LAN IP assignment to USB0

A Raspberry Pi 3B+ is configured with Raspbian with a working wifi: pinned to a static LAN IP address Per the procedure: a static IP 192.168.42.42 assigned to the rPi's USB0 interface. Append: ...
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Theoretical: TAP interface w/ WIFI parent interface

I'm trying to create multiple Linux TAP interfaces and allow them to send/receive packets over a single WIFI adapter. For all intents and purposes I'd like the TAP interfaces to act as full fledged ...
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Can I configure a manual link-only IP address?

I've recently purchased an unmanaged switch, and I'd like to have a number of devices wired to it via ethernet, communicating solely with one another (the use case is "wifi for the outside world, ...
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DHCP client doesn't have internet but can ping server

I have 2 VirtualBox machines (suse leap 42.3) one is DHCP (YaST) server so other is client. They can ping each other and i can set "static" ip for client using his MAC address, but client don't have ...
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Rasp Pi Stretch Swapping between Access Point Mode and Client Mode Displaying Errors Long After state change

I have a product, based on the Raspian Lite Stretch OS for the Raspberry Pi 3. On wlan0 we swap back and forth between Host Access Point Mode and Wifi Client Mode using the CLI commands Host AP => ...
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DHCP lease table in router shows weird entries when connected to Linux server

I have a domestic server where a MitraStar ADSL router is connected to a bunch of mobile devices plus two desktop machines (one Linux and one Windows) connected by Ethernet cables. IP address 192.168....
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Can a dhcp client select its server? How?

We have a bunch of IOT gadgets which will share cabling with a customer's regular LAN. We would like them to be logically separate. Let's say the regular LAN uses 198.162.x.x, and we want to use 10.10....
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Build DHCP server ubuntu 16.04 on KVM

How to build an DHCP server with ubuntu on KVM ? I have try some guide but when the DHCP client turn on, the interface will use the IP from the KVM network not from the DHCP server i just build ...
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SSH only working shortly after router reboot

I am trying to create a homemade server. I'm running Ubuntu 18.04 and have an Xfinity router. I've forwarded port 22 to a reserved local IP for my server. The problem is that I can connect via a ...
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Dhcp leases starting point

I have a linux server which acts as a dhcp server. Dhcp lasse range is 10.15.0.50 - 10.15.255.250. The first ip it leased is 10.15.80.10 Is there any specific reason for this? It keeps leasing ips ...
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How to make Debian 9's DHCP client check more frequently?

We're using a Debian 9 install on a Minnowboard (a small, embedded system). The Debian 9 install is nothing special - it's the regular Debian 9 image that we got from the Debian website, and had to ...
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How to release (remove) route from previous connection to public WIFI network using `nmcli` or `dhcpcd`?

Once I connected to public network then after awhile (1-2 hours) it won't give me access to internet. I assume this is because my routing is configured with previous IP given by DHCP of the public ...
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“iw wlan0 connect” doesn't works properly

i'm trying to connect an embedded linux distro, to my AP (named Validator_Test) that have no password configured. iw wlan0 scan works! But if i type the following with root permissions: iw wlan0 ...
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Debian Router Configuration Problem

I just got my brand new laptop and I intet to make the old one to act as a home router, just to play and learn a bit about Networking. After I fallow some tutorials, I make the configuration as fallow:...
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KVM, qemu, libvirt no DHCP on bridge

After I restart firewall on the host machine, I no longer get DHCP on guests until I restart libvirtd.service I am providing two network captures, one before restarting FW on the host (dhcp_ok.pcap) ...
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Is it possible for a dhclient-script exit hook script to hide a dhclient non-zero return code?

With dhclient, my understanding is that exit hooks in /etc/dhcp/dhclient-exit-hooks.d/* are sourced and run after dhclient completes. Because they are sourced, is there a chance that they could be ...
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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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How to configure DHCP server in Virtualbox CentOS7 VM for Cobbler PXE boot?

I am very new to Virtual Box and try to emulate cobber PXE boot network installation in virtual box Trying to configure VM1 as PXE/DHCP server and make VM2 as client to get the IP from VM1 DHCP ...
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Debian Taking Too Many DHCP IPs

I have a Debian server (Stretch 9.9) that I recently noticed some odd behavior on; the default Ethernet interface (the only one aside from loopback) seems to be attempting to grab every available IP ...
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Manage identical dhcp servers

I have a weird problem that needs a solution. I have many identical DHCP Servers, configured the same way, same subnet, same range, same everything (are actually some PCs) and i would like to somehow ...
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Run command based on IP address received

I'm looking at if I can have a bash/python script that triggers a command based on the IP address Linux has received via DHCP. e.g. DHCP received: 10.50.10.51 /24 runs command XYZ DHCP received: ...
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Is there a way to tell ISC KEA DHCP to always broadcast answers to clients?

I want to use ISC KEA DHCP v1.5 but I am not able to assign addresses to clients behind a wireless bridge. The reason for this is that KEA send sets the target IP address in the IP header to the ...
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get an ip automatic at direct connect

I have a raspberry pi with raspbian and on the eth0 port it is connected to my network and gets an ip address via dhcp. But now I want to unplug the ethernet cable and just use a new one that ...
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Enabling DHCP for IPv6 in netplan with networkd doesn't seem to do anything

I'm currently configuring the network interfaces for a Ubuntu 18.04 server, using netplan with the networkd backend. My hosting provider provides me with an IPv4 and an IPv6 for this server, however ...
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How does the DHCP server sort the MAC addresses according to the physical order of the clients? [closed]

There are hundreds of servers, one of which serves as a DHCP server. The hosts file of the DHCP server specifies the IP address and host name for each client server. But the MAC address of the client ...
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Prevent systemd-networkd (DHCP) from registering (NTP) time servers

I'm trying to stop some SBCs (running Debian) from updating their time via the router's own NTP server. We just want to use a manually configured one such as one from *.pool.ntp.org. I believe the ...
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How to determine whether an IP adress is static or dynamic without root rights

On SUSE linux, I want to determine whether the IP address of the machine is assigned statically or dynamically without having root access to machine. What commands can I use for this purpose? What ...
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dhcp/named client identification issue

I am running CentoS 7.6 which has been configured as DNS server (via named) and a DHCP server. In DHCP I have configured dynamic updates to my DNS zone such that new client leases will result in ...
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168 views

Switch between DHCP server and client on eth0

I am working with a arm micro-controller. Currently the controller is configured as a dhcp client on eth0 (ethernet jack) and as a dhcp server on eth1. I want to configure it to also serve dhcp on ...
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PXE Boot: “Failed to load ldlinux.c32”

I'm trying to create a PXE server on my raspberry pi, but if I try to boot, the client shows the Error "Failed to load ldlinux.c32". This is my folder structure of the tftp folder: Here is my ...
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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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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. ...
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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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How to set up functional private network bridge on qemu/kvm?

System My host is running Fedora 29, and my internet connection is wifi. Note that I am using X.org, not wayland; the SDL option in qemu doesn't work on wayland, and the curses option has trouble ...
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Modifying U-boot booting script and DHCP command script in Petalinux

I want to try the following things : Modify the booting arguments of u-boot of my Petalinux project which is currently using the Xilinx Kernel. I want to modify it such that it runs DHCP during ...
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Why is my client getting two IP addresses when connecting to WiFi?

A sub-question: why is my client requesting a specific IP address without a dhclient running? I have two access points. One is serving up two SSIDs, the other just one SSID. When I connect to the two-...
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No internet connection with some routers

On my laptop I run Debian Testing with no Desktop Environment. I manage the Wifi connections by adding entries to /etc/network/interfaces and then running /etc/init.d/networking restart. dmesg says: ...
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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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Running under systemd changes networking how?

For obscure reasons, I started a docker container from systemd. This container has a DHCP server in it. I ran nmap -e eth0 --script=broadcast-dhcp-discover.nse from the command line outside of any ...
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How to allow certain IP's accessing an IP:Port range?

So I have an ESXi server setup with pfSense acting as the DHCP Server for the VM's. I use VNC's to access each VM over the internet (For example with ports :5905,5906,5907 etc.) and I would like to ...
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Different Wi-Fi SSIDs, same network: cannot switch connections

I have a small network at my home, where the main Internet point stays at the living room, with two signals, a 2.4G and 5G, on the same network. Also, I have a Ethernet over Powerline link to my ...
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Does netmask and option subnet-mask have to be equal on a dhcpd.conf definition?

Using linux servers on a dhcpd.conf file I can make a definition of ip ranges that the server will assign to host computers on the internal net: subnet 10.0.0.1 netmask 255.255.255.0 { range 10.0.0....
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NetworkManager interferes with hostname configuration

I'm running an arch system with KDE4/Plasma, wpa_supplicant, networkmanager, systemd ... # cat /proc/version Linux version 5.0.0-arch1-1-ARCH (builduser@heftig-18825) (gcc version 8.2.1 20181127 (...
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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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No IP4 connectivity over bond; slaves listed as “routable” instead of “enslaved”

Bond settings: root@gentooserver /etc/systemd/network # tail -n +1 * ==> bond1.netdev <== [NetDev] Name=bond1 Kind=bond [Bond] Mode=802.3ad MIIMonitorSec=1s LACPTransmitRate=fast ...
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How do I connect to wifi using nmcli on slackware? Re: DHCP client

I've just installed Slackware 14.2, and I'm trying to get everything working. I started out trying to use KDE, but I like the command line better anyway, because it doesn't hide so much from me. So, ...
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DNS + DHCP in home lab [closed]

Setting up a home lab. I was originally planning on using static ips for everything and then powerdns + poweradmin for DNS. Recently though it dawned on me that it would be a lot simpler to just use ...
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How to permanently change interface metrics if using DHCP on SLES 12?

At: Changing the metric of an interface permanently I can see there is a solution, that when if geting IPs via DHCP, you can set metrics per interface, so a given one could come up later. But for ...
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How to override DHCP client identifier

I'm running a DHCP/DNS server with dynamic DNS on Debian 9 (Stretch) How do I override a clients DHCP identifier and place in my own custom value? E.g Android phones on the network identify ...
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Dnsmasq/Ubuntu “NoDHCP or proxyDHCP offers were received”

I've spun up a Ubuntu 18.04 (Bionic Beaver) server* with the intention of mounting the DBAN .iso so that I can PXE boot this. *server version of Ubuntu but this is actually desktop hardware (a Dell ...