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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Dual WAN Failover Routing w/ Dynamically Assigned IP Addresses

I'm setting up a portable, embedded Linux machine for use in outdoor environments where I'm likely to get internet access either via an in-field wireless network or a cellular data connection. On top ...
lolwut68's user avatar
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Windows 10 reset keeping user files does not fix reoccuring DHCP Service permission problems, will a full reset fix things

I have reoccurring permission problems (?) with the DHCP Service of Windows 10. At least that is my assumption. The problem i am observing is that after connecting to a Network (wireless/wired) I am ...
till's user avatar
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Access Point not forwarding on DHCP packets to gateway to assign IP - Raspberry Pi Bridge

I have a Pi with 2 wireless interfaces, 1 is connected to the networks gateway, the other which is acting as an access point thanks to hostapd. The AP is not running any DHCP or NAT software, simply ...
Slinky's user avatar
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Make Dynamic IP from ISP like Static [duplicate]

As the title says, is it possible to have a dynamic IP from an ISP and make it renew when the lease is up to the same IP? I ask because I would like to run a Home-Page and a VPN + FTP service on the ...
Johannes33's user avatar
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Almosy locked out of PfSense after setting static ARP table

So I almost locked out myself from pfsense after setting static ARP table in the dhcp severs's conf. Now, I can't access pfsense from the network (nor ssh, nor webgui) because every request times out....
Taz8du29's user avatar
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Starting dhcpd: [FAILED]

I have a Centos 6 virtual machine using KVM. When I start the DHCPd service "service dhcpd start", I get the following: Starting dhcpd: [FAILED] When I execute "dhcpd", I get the following: ...
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Wireless client on UniFi doesn't DHCPREQUEST from Mikrotik DHCP Server

I'm having problem that sometimes wireless clients doesn't receive IP from the DHCP server. The network map looks like this: All IP are static leases configured in hEX built-in DHCP server. I have ...
willwill's user avatar
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DHCP and network infrastructure

I'm currently deploying domain controllers in my company network, and I would love to have my own DHCP server within my network. The problem is that a another company in the building is controlling ...
Frisbee's user avatar
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how to configure isc dchp server with different subnets with different wl-access points

I have two different subnets in the same layer 2. 192.168.1.* 192.168.2.* add. two gateways for access to the internet 192.168.1.1 192.168.2.1 add. two wl access points 192.168.1.2 192.168.2.1 (...
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Configure two DHCP relay agent in same Vlan

Based on a recent issue I encountered, I'm raising the question. Say you have a VLAN that spans between a few switches, but there are two VLAN IP interfaces at two different places in the same area, ...
Vikash Srivastava's user avatar
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DHCP Asking A Server For The Hostname Of An IP Lease

I am trying to understand what data is actually stored on a DHCP server. I understand the process of how a client gets a lease for an IP address from a server, but is it possible to poll a server for ...
Jon's user avatar
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How can I configure my computer (localhost) to assign dynamic IP addresses to virtual machines made by virtual box?

How can I configure my computer (localhost) to assign dynamic IP addresses to virtual machines made by virtual box? Note: I am using Ubuntu Desktop LTS 16.
NSD's user avatar
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lpc1768 does not get ip from router

I have added simple dhcp client code to current tcp/ip stack running on lpc1768. For testing purpose i connected lpc1768 to my laptops ethernet port. Also i have enabled internet[from wifi] sharing[to ...
Beyonder's user avatar
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Static IP Connection to the internet fails once in a while (too much)

I live in a dorm that the whole building shares a /24 subnet. IP assignments are static (static IP, static DNS, and static Gateway). Since one month, my internet connection on the windows fails once ...
Makan's user avatar
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Creating DHCP on Virtual Box with windows 2012 server running

I'm trying to set up a DHCP server inside a Virtual box running Windows Server 2012, I'm having trouble completing the configuration of the DHCP server. I've allowed echo requests inside the firewall, ...
EK1221's user avatar
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Ubuntu - enable dhcp client on all interfaces

I build a VM image for different visualiser types, and I would like it to use dhcp on all available network interfaces (wired only). I'm using Ubuntu server. Pre-creating /etc/network/interfaces is ...
Congelli501's user avatar
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open dd-wrt : WAN address assigned, no internet

I have a linksys WRT1900 flashed to DD-WRT 3.0-r30796 and I am trying to connect it to a comcast modem/router to act as a DHCP for LAN. When using DHCP for WAN I am assigned an address (10.0.0.2) from ...
TechnoNewbie's user avatar
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Can't access fileserver in other network

I have a question: How can i access my Fileserver from my laptop? (see picture) The laptop can ping the Fileserver, but can't connect to it. Also the fileserver does not show itself in 'This computer &...
Maik Verheijen's user avatar
1 vote
1 answer
5k views

Can't connect with IP outside the DHCP range

My modem/router (it acts as both) has an IP of 192.168.0.1. The subnet mask is 255.255.255.0. The range of IP addresses used for DHCP is 192.168.0.100 to 192.168.0.200. To be clear, if I connect with ...
Kevin Mills's user avatar
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Android getting assigned alternative IP even though already has one reserved

Within my network, I have an android device that I have reserved an IP address for, but after rebooting the device a new IP has been assigned. the names are identical so unsure why this would happen?...
emma perkins's user avatar
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Problems with powerline/2 router setup (interference?)

I am attempting to get the following network to work: BT Homehub (primary router, upstairs) <--- powerline (TP Link AV1200) -- -- powerline (TP Link AV1200) --> Sky SR102 (secondary router, DHCP ...
renifer7's user avatar
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880 views

Unable to bring network interface eth0 back up after changing mac address with macchanger

I couldn't find an answer for my issue, so I'm posting this. I'm using Kali linux and when I successfully change my mac address using macchanger, I'm unable to bring my network interface eth0 back up....
GreenTeaTech's user avatar
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Second router configured as refuses to connect most of the time

I have setup a second router as an access point but it has very temperamental wireless connections. Devices either cannot connect at all to the second router (setup on a different channel, and SSID) ...
ruskind's user avatar
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Is this 2 router setup double NAT?

I have one router connected via the WAN port to the internet it is doing DHCP and its address is 172.16.0.1, gives out address 172.16.0.2 - 172.16.0.100. Now a second router is connected by a cable ...
Zaine6's user avatar
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Single machine with DHCP client on one network interface, and DHCP server on another?

I have a Raspberry Pi 3 running a version of Raspbian 7 (wheezy). These devices have an Ethernet RJ45 port (eth0), and a wireless WiFi module (wlan0). I would like to set them up as on this image: my-...
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Boot Freedos 1.2 from PXE Server

I have been scouring sources for a while and I can't quite figure out how to boot an old 486 with a new NIC via PXE. What I want to do is boot FreeDos 1.2. During the boot sequence the NIC looks for a ...
Sean Connelly's user avatar
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1 answer
1k views

how to use captive portal to authenticate getting IP address from external DHCP?

I want to force users to authenticate in a captive portal in order to get an IP address. If that is impossible how can I give them an IP to communicate with a captive portal after authentication? I ...
Ridae HAMDANI's user avatar
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Is the DHCP 60 unsecure?

My ISP provider request to enable DHCP 60 mode. As I am not aware of the consequences, I would like to know if it is unsecure ? Does the PPPoe more secure vs DHCP (between ISP and a user) ?
Bertaud's user avatar
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Windows 10 DHCP Client doesn't work

I'm experiencing a problem with all my Windows 10 clients, once a while they lose their ip address. This problem happends at Windows startup or also after some time. The symptomp is the tipical DHCP ...
Tobia's user avatar
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I have a two routers, and the one is static and has 3 PCs connected to it also I have DHCP server

Scenario: Router2 is static I wanna ask what is the supposedly IP address, default gateway, DNS1, and sub of PC1 to PC3.
Rose01's user avatar
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Windows 10 firewall issue

My windows 10 firewall has currently been modified (Not by me), and whenever I need a new DHCP lease. I had a problem pulling an IP, so I looked at wireshark, and l see both the DHCP Discover from ...
Mr 1235813213455's user avatar
1 vote
1 answer
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Using netctl, how can i force the use of only the configured DNS and ignore those provided by the DHCP?

In the according netctl profile i use IP=dhcp and DNS=('some_host'). In addition, the DHCP server offers a DNS at 192.168.1.1. I end up with this content in /etc/resolv.conf: nameserver 192.168.1.1 ...
user569825's user avatar
2 votes
1 answer
6k views

How to route DNS requests to a specific DNS server?

I have a set of virtual machines that I have to configure for a school assignment. I configured a DHCP and a DNS server at my server machine. At the DHCP file the option-domain-name servers is ...
rockability's user avatar
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1 answer
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Router DHCP settings while configuring Static IP

I've been finding my way around the web trying to configure a Static IP ( on Ubuntu Studio 16.04 Trusty Tahr) but seem to mess up. Is the router setting -to assign a DHCP- as checked in the settings ...
Autoresponder's user avatar
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1 answer
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So Microsoft killed DHCP with a Win10 software update. How to fix it?

http://arstechnica.com/business/2016/12/microsoft-windows-10-dhcp-broken-update/ Excerpt: Microsoft has quietly fixed a software update it released last week, which effectively prevented ...
SDsolar's user avatar
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how do I SSH to a specific machine with DHCP and NAT?

I want to ssh across the internet, one network to another. Specifically, from my LAN using a run-of-the-mill router and cable modem to a neighbor's LAN using a different run-of-the-mill router. The ...
Thufir's user avatar
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No getting IP when connecting through switch

I am trying to acquire IP from a router through switch. Network structure: However, no getting IP when my pc is connected through a switch. Things I've tried: Connect my pc to router when DHCP ...
Mike's user avatar
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2 votes
1 answer
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How do I get pfsense WAN IP after I set it up on DHCP?

I just installed a FreeBSD 64-bit virtual machine with pfSense 2.3.2 with VMware Workstation 12, but with VMware Workstation 11 hardware compatibility. I booted and standard-installed pfSense and got ...
Mohamedali Hamdi's user avatar
2 votes
1 answer
3k views

Two routers in the same subnet and VPN?

My network just got more complicated recently after I had to add a router from my ISP because I want to use their optical telephone service, provided by the router 1: In the manual it says that the ...
Kitanotori's user avatar
2 votes
0 answers
1k views

Blocking DHCP between two bridged home networks using nft

So my setup is as follows. I have two home networks and a server standing elsewhere. I'm running OpenVPN as a server, on the server to connect the two home networks into a single big network. Because ...
DerFlob's user avatar
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1 answer
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PC is getting wrong IP address despite DHCP

From one day to the other (maybe a windows update was in between, not sure), my PC is currently always (self assigning?) getting an IP address configured like this: Automatically configured IPv4-...
F.P's user avatar
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1 answer
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Gentoo installation and DHCP issues

I am trying to install Gentoo from the minimal install disc on my old 32-bit Lenovo T60 laptop. After getting past the initial install screen to the minimal install CD shell I got a DHCP error and was ...
CompMan's user avatar
1 vote
0 answers
22 views

How do you identify if Network Preferences are set to Manual IP address or DHCP in terminal

I'm managing about 20 Macs and I'd like to quickly determine if the network preferences are correctly set to have a static IP address or (incorrectly) using DHCP. Is there a way to run a query through ...
chrisnhamp's user avatar
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1 answer
698 views

Windows Firewall with Advanced Security - DHCP leakage?

When I start the program "dhcptest.exe" (on Win7), I get a firewall warning. Blocking creates two new Inbound Rules, blocking TCP and UDP. (no outbound rules). When I run the test, it sends a DHCP ...
user165568's user avatar
2 votes
4 answers
21k views

How to get a new IP from DHCP server that's different from existing IP

Running Windows, whenever I try this: ipconfig /release net stop dhcp net start dhcp ipconfig /renew I get the old IP address re-assigned except on the first attempt. On the first attempt it gave a ...
KaiserPerwez's user avatar
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Approved behaviour of disconnected router receiving DHCP discover packet

What is the normal/approved behaviour of a router if it receives a DHCP discover packet when it has no connection to the Internet? Background: I have lost my home broadband connection. The ISP (...
Neil Strickland's user avatar
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1 answer
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How can I solve a Limited access network issue?

I live in Venezuela and here the internet provider I have is called "Cantv" and I haven't had issues with my internet connection until now. Whenever the lights of my modem indicate that it's active ...
Jose Luis Pacheco Boscán's user avatar
1 vote
0 answers
240 views

DHCP Server Issuing same IP address to client

Greeting Guru's I am using CentOS DHCP and DNS Server. Recently, I have notice that the DHCP Server has been issuing multiple IP Address to same client (Phone/Laptop). This has caused IP Conflict in ...
monketrip28's user avatar
8 votes
1 answer
3k views

DHCPD logs show PC's requesting IP addresses from router when they are turned off. Are our log files incorrect?

We have a small office and on checking the router logs I noticed that a number of computers have requested IP address from the office router outside of business hours. This is the log file output: ...
bloopiebloopie's user avatar
0 votes
2 answers
550 views

Do not allow DHCP to assign reserved IPs

I have EdgeRouter X with a Linux (EdgeOS) on board, so when I created a new DHCP server for VLAN I have reserved (mapped an IP with a MAC address) a several IPs for my devices to be able to bypass ...
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