Questions tagged [dhcp]

Dynamic Host Configuration Protocol; allows computers on the same network to automatically obtain unique IP addresses and other network configuration parameters.

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No longer able to visit, push or pull or get any response from GitHub

From one moment to the other without changing anything in my network or PC, I suddenly can no longer visit github.com, and can no longer pull/push my repositories. Everything else works perfeclty fine....
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DHCP issues in company network [migrated]

I'm experiencing some issues with some DHCP clients, sometimes they cannot get DHCP leases. My company has a Windows Server 2016 DHCP server with a failover twin server, both are also domain ...
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Connecting the old router to the main router

I have Calix 854G-2 as my main router (with IP: 192.168.1.1), and Netis WF2419, the old router that I want to connect with main router via wireless (not able to connect them with cable). In the DHCP ...
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Set up a router with DHCP in a non DHCP network

DHCP network A with static IP-adresses. Now I want to setup a router in network A and give it one of these static IPs. As far as I understand the PCs that will connect to that router will get their IP ...
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How can I ensure that my home LAN is not affected by my cable modem's outage

As probably with most of the world, my cable modem experiences downtime intermittently each day (for maybe several minutes). The problem is, I use my cable modem for DHCP - I have a switch connected ...
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How to configure a Hyper-V server with VMs, PMs and a wifi hotspot

I have to, for the next month, run my home network off a wifi hotspot provided by my phone. I've moved house and previously this was working successfully via my router. I've had it setup using static ...
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grep output “begin” option

Is there an option to get the output from the grep but that output needs to start with the word that I am searching for? This is really hard to explain so let me give an example here: When you want to ...
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TP-Link T1500G-10PS Unable to Access Web Management

The topology of my network is the following Internet -> Modem -> Router (EA9500) -> Switch (T1500G-10PS) -> Laptop I am getting internet on the laptop; however i am unable to see the IP ...
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2 routers, 2 ISP, 3 access points. Same Network

I have the following situation: i've got 2 WIFI routers with different ISP's their config: 1st router's IP is 192.168.1.1 | DHCP Enabled 192.168.1.2-254 | Dlink DIR 825 ACF 2nd router's IP is 192.168....
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Why the IP address of the router is used as the address of the dns server?

These are the steps for converting a router to dhcp: Why used the router IP as the DNS server IP address in the last case? Should not use the IP address of servers like Google (8.8.8.8)?
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configure DHCP server service on fedora

I have installed DHCP on fedora using yum. I need to configure the DHCP server service for the 192.168.26.0 network. Using a DHCP range of 192.168.26.50 – 192.168.26.100 What commands can help me do ...
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dhcpcd using wrong MAC address on DHCP request

I have 2 rbpi that use the dhcpcd daemon. The second one is using a clone image of the first. After having detected a problem with DHCP (they got disconnected for long periods of time for no reason), ...
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DHCP server configuration for LAG client

I have a NAS server (Linux based) connected to my lan. The NAS has two redundant LAN cards configured using LAG (dynamic link aggregation 802.3ad). I want to create an address reservation using my ...
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Is there a way to know what public ip addresses my pc had last months or year?

Is there a way to know what public ip addresses my pc had last months or year ? Are they saved somewhere ? Thanks in advance
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While using phones hotspot , should the wifi mac address same as the dhcp mac address?

I have my laptop connected to internet through my mobile phone's hotspot . Now on doing ipconfig /all in cmd , it shows the same address for DHCP and DNS servers (supposedly my phone is expected to ...
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I logged in and saw two ip's on the same device (enp3s0). DHCP won't work well. How do I resolve this?

While ssh-logging in on a 20.0.4 ubuntu server using the hostname I saw this: IPv4 address for docker0: 172.17.0.1 IPv4 address for enp3s0: 10.0.0.10 IPv4 address for enp3s0: 10.0.0.14 IPv6 ...
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How to set the default outbound interface in Debian when using multihomed interfaces on EC2

In Debian 10 with an Amazon EC2 AMI (as of March 31, 2021), the /etc/network/interfaces file looks like this: # Include files from /etc/network/interfaces.d: source-directory /etc/network/interfaces.d ...
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Devices keep disconnecting when DHCP lease time is longer than 2 minutes

I recently changed my home router to ASUS RT-AC86U. I have about 12 devices connected to it via Wifi, some of them are ESP8266 mini d1 boards, which keep disconnect from the router when their DHCP ...
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Use a gateway's ethernet switch with a different DHCP server

I have Comcast Business internet, but currently operate their gateway without its DHCP server or wifi adapter (I have my own connected via Ethernet). I would like to use the gateway's builtin ethernet ...
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What is boot file in PXE booting?

So, I'm learning the peinciple(or mechanism exactly) of PXE booting over the network, what I understand is: Client contact the DHCP server by broadcasting the DISCOVER msg with 2 key options(66 and ...
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How to assign IPv4 addresses to LAN clients on OpenWrt?

I flashed my router with OpenWrt and while WiFi devices receive IPv4 addresses, LAN [wired] devices receive IPv6 addresses. I am new to networking and not familiar with IPv6, so I would like to avoid ...
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DHCP Options in VMware Fusion

I tried to get my DHCP server on vmnet2 to include an option for a particular host, so I added this configuration below the "DO NOT MODIFY SECTION" block in the relevant config file (/...
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How can I force devices to get IPv4 addresses from my AT&T router?

This is driving me nuts and I'd appreciate some help. THE SETUP A small Ethernet LAN with an AT&T gateway + router. The LAN has two PCs and 20 Raspberry Pi devices. All dynamic IPs (DHCP) THE ...
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Access different subnet IPs on two different interfaces

I'm trying to configure my Raspberry Pi to give me access to devices connected either of eth0 or wlan1. Desired function is this: User connects to RPi AP via wlan1 and is given an IP (192.168.4.x) ...
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Connect two networks with different subnets

The ISP cable is connected to a Netgear router (main router, DHCP enabled). From this router goes out two cables, one for a server with static IP 192.168.1.3 (Windows Server 2012, with 2 NICs) and ...
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netplan - Network with DHCP configured, but no internet

I am trying to configure my Ubuntu Server 20.04 LTS to use DHCP in its network configuration. Many tutorials on the internet recommend that I create the following file with the following settings... ...
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No able to send required option(i.e. option 16) in dhcpv6 using client dhclient in Linux

I need to configure dhclient to send option 16 in solicit message. I have updated dhclient.conf file as follows send dhcp6.vendor-opts 00:10:00:0E:00:00:01:37:00:08; request dhcp6.fqdn, dhcp6.name-...
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Keep file permissions on dhcpd.leases after reboot on Linux

We have a Linux machine on which we run our .NET Core app. This app is a web UI which is used to display and configure a system of EEPROMs. The app reads the dhcpd.leases file, located in the ...
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Ubuntu Server running Pi-Hole unable to resolve host: no address associated with host name

I recently turned a recycled 2012 Macbook pro into a recursive DNS. I installed Ubuntu server 20.04.2 onto the machine and am using Pi-Hole, which is used to block the ip address of ads on most ...
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Migrating VLAN configs from OpenWRT to MikroTik

I'm currently using an OpenWRT wifi router in my small retail shop. It's done OK, but has become unstable when heavier loads are applied. I decided to migrate from a single OpenWRT install to 1x ...
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Can I route DHCPv6 and Router-Advertisements through another router?

I have a dual router setup (two routers behind each other) and I want to get IPv6 working on my Local Network. ISP <-> Router_1 (Vodafone Station) <-> Router_2 (Unifi USG) <-> Local ...
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isc-dhcp-server response not being sent over a wireless bridge

I am trying to add some WiFi access points to my network. When I set them up they default to being being routers, but I want them to be set as a bridge. When they are working as routing, they work ...
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Wireless and Wired network - Different IP causing print issues

I am having some issues ( I believe) with DHCP on wired and wireless. My Frontier router is setup with DHCP range: 192.168.254.10 - 254. that seems to be fine and I see wired devices in the IP table ...
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Bonding with DHCP - dhcpd.conf setup

I am trying to setup a bond connection in Centos 8 using dhcp. How do I enter the mac address of the bond interface in the dhcpd.conf file so that bond interface gets it's IP address from dhcp? I am ...
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Unable to receive DHCP address

I'm unable to receive a DHCP address from the server on the network. Currently this is what I get if I have dhcp enabled from the ethernet adapter status: Connection-specific DNS Suffix . : ...
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Getting connected to the wifi but not to the internet

My laptop's windows os is getting connected to the wifi but not to the internet whereas other devices can can access the internet when connect to the same wifi. I tried a solution from here but the ...
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Can a DHCP Client tell the DHCP Server not to hand him a specific IP address?

I have a device that has two ports and one always requires static IP address "X". The other port can be connected to a LAN for internet access. Is it possible that when that port is ...
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Map network drive by IP (3rd octet)

I would like to map the correct network drive (from several ones) to a computer using the IP assigned by DHCP through a batch script. So when the computer connects and i.e. gets allocated the IP 192....
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pfSense DNS Resolver does not resolve local hostnames from DHCP static mappings

I'm on pfSense Community Edition 2.4.5-RELEASE-p1 I assigned some static DHCP mappings on one of my LAN interfaces If I try to reach any one of those static mapped hosts by its Hostname (or by Client ...
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Scenario where DHCP static lease AND static IP (both with same IP) on same machine?

OK the obvious answer is that "this is stupid", but please read the scenario. Let say, we have a very sensitive piece of equipment (like an alarm system), that we want to eliminate as many ...
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is it possible for a Macvtap interface to behave exactly like a Linux bridge when it is set to mode bridge?

I have a Macvtap interface running in Bridge mode connected to the eth0 of my machine and it provides connectivity to a QEMU process. I have been facing a weird issue where DHCP requests coming to the ...
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No Response to DHCP OFFER message on PPPoE+Dynamic IP(dual)

My ISP provides internet access to my Home Router(Gateway) via PPPoE authentication. So once after resseting my router, while configuring it I clicked on 'Auto-detect' for WAN Connection Type and it ...
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Connection issues when router in bridge mode is between modem-router and user device

I decided to extend my home network's wireless coverage by utilizing a spare router. Both routers are modem-routers and have been provided by different internet providers the previous years. So, their ...
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1941W wireless clients losing DHCP IP address

I am attempting to 'extend' a 192.168.1.0\24 network with an experimental network 192.168.10.0\24 using a 1941W router. I have configured 1941W to distribute a 192.168.10.0\24 network, with WLAN ...
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IPv6 on Android with DHCPv6-based ISP

My ISP assigns IPv6 prefixes using DHCPv6. I know Android only supports SLAAC. Is there any way I can configure my router to provide Android devices with IPv6 Internet connectivity?
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Can I configure my Windows 10 PC as a DHCP server on a local switch?

I'm creating a local network that I would like to have DHCP capability. I have a primary Windows 10 PC that will be on the local network full time. Is it possible to configure this PC as a DHCP server ...
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Ubuntu 16.04 dhclient won't use DHCP static IP from router (DHCPDECLINE)

Ubuntu 16.04.7 LTS I am trying to give this Ubuntu server a static IP on my LAN by using a manual assignment on my Asus RT-N66U router and it won't stick. Manual assignments works as expected for ...
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Why would DHCP fail so often on a domestic network?

Recently I've noticed that one of my domestic devices (smartphone, laptop, pc) may lose its connection to the internet while other devices are still connected. It happens every day now. After a search ...
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Recreating machine-id kills DHCP in Ubuntu

I am having a bit of an odd problem with an Ubuntu template I am working on. Basically, doing "echo -n > /etc/machine-id" for template sanitation purposes to have the system recreate it ...
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Deny DHCP the reaching rest of network linux

I am creating a network of vulnerable VMs & a DHCP server (to allocate IPs to these VMs) and I don't want the rest of my network to be able to access this DHCP server and gain leases. The DHCP ...

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