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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How does DHCP server knows what router interface is the gateway for each different scope

If I have a DHCP server as on the Network Diagram graphic above on the broadcast domain of the fa0/1 and I create three scopes for example: name: "scope_fa01" range: from 192.168.1.1 to 192.168.1....
0 votes
1 answer
824 views

How to configure DHCP with multiple NICs in one subnet?

I want my linux server act as a router. There are four ethernet ports (eth0, eth1,eth2,eth3) on the server and one wireless card (wlan0). eth0 is the gateway (WAN), eth1-3 are LAN ports. How to ...
1 vote
0 answers
40 views

Tiny windows console_only DHCP server

Looking for %subj% IPv4 tool to use in windows shell script. Need following actions by the shell script runtime: start listening [on specific interface if posible] DHCP server DHCP server catch first ...
0 votes
1 answer
732 views

Can DHCP and DNS both use .local on the same LAN?

My local LAN machines are assigned IP addresses from a Fortigate 60D DHCP server. The DHCP uses .local as its domain name. I now started a DNS server, also running off the Fortigate 60D. I'm ...
3 votes
0 answers
2k views

dnsmasq is providing the same IP to two different clients

Consider the following dnsmasq config (used for a VPN server which is on a tap interface tap_vpn0): dhcp-ignore-names dhcp-generate-names dhcp-sequential-ip interface=tap_vpn0 dhcp-range=192.168.120....
0 votes
1 answer
131 views

second router dhcp problems

here is the situation: bevor asus router rt-n66u (192.168.1.1) for my appartment --> netgear wifi-repeater for my sisters appartment 50 meters away (free line of sight), the ip adresses for all ...
2 votes
2 answers
52 views

LAN on 2 locations with weak link - how to set up fallback DHCP+RADIUS if there's a disconnect between the locations?

The site concerned is small and it's long, thin and winding, without consent to drill holes. There's an area affected by this, which has a couple of file servers, and 2 sporadically used PCs. To be ...
1 vote
1 answer
1k views

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 ...
0 votes
2 answers
2k views

Router "ghost" connections

My Linksys WRT54GS2 V1 has begun to display ghost wired connections in the last weeks. As you can see from the images I have nothing connected except for the power cable. I have tried a hard reset ...
0 votes
1 answer
200 views

How to "forward" dns ip addresses one level deeper?

I have a mobo with 2 ports: eth0(WAN) and eth1(LAN) which i want to use as a router/gateway(NAT). But at first I want it to manage DHCP. I've installed Debian, configured eth0 for dynamic and eth1 ...
2 votes
1 answer
2k views

Make Windows 10 send the "computer name" as DHCP hostname

I'm running one linux machine and one Windows 10 machine on my OpenWRT wireless router. Both machine's names used to be "known" to the router, and I would be able to connect from one of them to the ...
1 vote
1 answer
1k views

How to set static IP address to UDHCP client?

I am using udhcp client for an embedded device. I am trying to add a feature to set a static IP, Netmask, DNS, and gateway address. I am trying to set it through the "-r" argument (request): /sbin/...
0 votes
1 answer
140 views

Additional "internal" access point with own DHCP

I am building myself a home automation system which will have some networked devices that connect to wifi and a few that connect via a cable. But I want those devices to be somewhat separate from my ...
1 vote
1 answer
427 views

Questions about dynamic IPv6 use inside the home [closed]

Let me start by asking to skip dual-stack discussions at this time. Any device that can only handle IPV4 only is stuck there and I'll worry about it later, if I need to. So this discussion is just ...
0 votes
2 answers
2k views

Windows 10 ethernet not working, nor network reset, but works fine in linux

I temporarily live in flat where there is only a wired connection. In Linux it works fine (therefore I know problem is not in hardware nor in cable), but in Windows 10 I cannot connect. I tried many ...
4 votes
1 answer
27k views

Set up Windows10 sharing wifi over ethernet

This is a bit of an embarrassing question: on one hand one would assume it's straightforward (lot's of similar hits in google, I haven't found it asked here before...), on the other hand all purported ...
1 vote
1 answer
11k views

Virtual Box Bridged network failed to get IP (DHCP) No DHCPOFFERS received

I am newbie in networking and virtual box configuration, I have spent several days dealing with this problem. My goal is to get Bridged network working. When I try to UP interface in my Virtual Box VM,...
1 vote
1 answer
2k views

Setting up an external DHCP server causes Huawei B310 to stop responding

I have moved houses, and thereby internet providers. Choosing a 4G connection rather than a landline, I bought a Huawei B310 for my home network. My LAN is unusual in that I run my own DHCP and DNS in ...
2 votes
1 answer
174 views

Turning on DHCP when main router goes down

Our shared internet network goes down when our friend who pays for a unlimited LTE plan leaves. His phone is essentially the main router. However, recently we decided to create a local network aswell. ...
2 votes
1 answer
5k views

How can I recreate a unique identifier for DHCP in Ubuntu 18.04?

Following up from this question: Wrong IP address from DHCP client on Ubuntu 18.04 . The TL;DR version of the question above is that Ubuntu has changed from identifying itself to DHCP servers with ...
0 votes
1 answer
588 views

Bridging Traffic on a LAN w/o DHCP

I want to establish a low-latency, wired, local-area network (LAN). I have a handful of ubuntu linux machines (en route), but I only have command line access to one of them, call it box-a. As part of ...
0 votes
1 answer
341 views

Adding a second modem to my network

We are a dozen of people on a small network with one DSL modem, and one netgear switch that connects to a patch panel to distribute the wires to all rooms of the office. The DHCP is disabled on the ...
0 votes
1 answer
5k views

Windows DHCP Server - Script to remove duplicate leases to the same hostname

I’m looking at creating a script that clears out duplicate DHCP leases from our Windows Server 2008 R2 based DHCP server. I’ve found out that you can’t do this natively in PowerShell, but you can use ...
6 votes
3 answers
38k views

Can you manually assign IP address that is out of the DHCP range?

If I setup a router/modem to have DHCP range of 10.0.0.1 to 10.0.0.50, How do I manually assign one of the machines an IP address out of that range - eg. 10.0.0.51? I need to do this so that I can ...
1 vote
1 answer
237 views

Can DHCP requests leak information to my ISP while I am connected to a VPN?

I don't know a lot about networking, so this question might have some basic misconceptions. I'm using OpenVPN 2.4.6 (server) and OpenVPN GUI 11.10.0.0 (client). My server is configured with: push "...
0 votes
1 answer
473 views

Samba reload on new dhcp lease

I have a phone tethered via usb. I'm using the phone's data connection. Whenever I run dhclient for the new lease ( NetworkManager is off ) I get error messages but the lease succeeds. Here is the ...
0 votes
2 answers
341 views

Windows 10 uses a different DNS

I configured my routers DHCP to use Level 3 DNS which is 209.244.0.3 and 209.244.0.4 and it is also correctly shown when I check via ipconfig /all: ipconfig dns output: But when I check via ...
2 votes
1 answer
3k views

Initializing DNS in dnsmasq before leases assigned

I am in the process of transferring DHCP/DNS services for my LAN from a system running wheezy to a system running stretch. Both DHCP and DNS are provided by dnsmasq. What I'm seeing, at least with ...
0 votes
1 answer
584 views

DHCP Sending gateway address ending in .0

My in-room router (which i have set up as an access point) is connected to another main router downstairs managed by the home owner. Im calling the main one router A and the one in my room router B. ...
1 vote
1 answer
2k views

dnsmasq DNS resolution issues

Pulling my hair for days here setting up DNS and DHCP with dnsmasq and the new way of doing things with netplan. WAN-router is on 192.168.0.1 - works fine LAN-router (Ubuntu 18.04) received 192.168.0....
0 votes
0 answers
3k views

Configuring Raspberry Pi as DHCP/local DNS server, Stretch vs Wheezy

I've been using dnsmasq as a DHCP server/resolver on an old Raspberry Pi, running wheezy, for years without any problems. I decided to upgrade to stretch and, at the same time, to a Raspberry Pi 3B+. ...
0 votes
1 answer
125 views

How to connect two devices connected to separate routers at home?

I have an ISP provided modem 192.168.1.1 with DHCP on, then a Linksys router LAN connected on with ip 192.168.16 also with DHCP. Then a Synology 10.172.1.120 as it is connected to the Linksys router (...
2 votes
2 answers
3k views

Can I connect three routers together using their WAN ports?

Me and a colleague of mine are trying to connect a Arris Cable router to a Linksys EA38400 and a Linksys E3200 utilizing their WAN ports rather than cascading them using their LAN ports. Arris Router ...
0 votes
1 answer
197 views

DHCP relay agents

So the relay agent appears to have an internal IP that is part of the subnet. The relay agent is also on the router. I think it can also be on the switch, which would support my theory that the DHCP ...
0 votes
1 answer
253 views

I once gave my Ethernet a static IP-address but now it changes to it automatically all the time? [closed]

My question is about the error inside my Ethernet Adapter inside the Ipv4 protocol. I screwed things up inside the registers, I guess. How to fix it that it never gives it a static IP address again? ...
1 vote
1 answer
3k views

Modem and Router on same subnet, but network doesn't work properly

Now I'm looking for more information why do my network file sharing doesn't work properly even if I made router to be part of LAN. I'll explain all my possible changes I can remember. I chosen to ...
0 votes
1 answer
1k views

Dynamic update of DNS without the use of AD

I try to make a stand alone DNS and DHCP server without a domain controller. I have I have on the zone dk. enabled "Nonsecure and secure" Settings for DNS : For DHCP I have checked "Enable DNS ...
31 votes
6 answers
44k views

Why do most routers not include local DNS?

I need to change my firewall/router, and I'd prefer something with built-in DNS to resolve queries on the local subnets. I've got a mixed Linux/Windows system, often with only one computer turned on, ...
17 votes
2 answers
10k views

How do DHCP clients know which of multiple DHCPOFFERS to accept?

Imagine we have a network like in the picture. Six hosts on one layer 2 network, no VLANs. The network is supposed to be segmented into two subnets, with one DHCP server each. The DHCP servers have ...
1 vote
1 answer
4k views

Two routers with DHCP?

My current network setup is like this: SKY Netgear Wireless Router (Downstairs) ----> Homeplug ----> DG834N Netgear Wireless Router (Upstairs) What I would like is to have DHCP enabled on both ...
1 vote
2 answers
4k views

How to identify blank hostname in my network

I share the Internet with my neighbour, but it's mine. He asked me to do it since he couldn't ask for his own (Venezuela's things). There's an ethernet wire that goes from my router to his house and ...
1 vote
3 answers
1k views

Trouble with fiber modem

My neighborhood just activated fiber service to the home (http://fiber.usinternet.com/ in Minneapolis), but I'm having trouble connecting downstream devices to the modem. It's a CTC Union GSW-1005MS ...
0 votes
2 answers
746 views

DHCP server sending DHCPDISCOVERs

After upgrading to Debian 8 running isc-dhcp-server I began seeing these on the logs: servername dhcpd: DHCPDISCOVER from yy:yy:yy:yy:yy:yy (servername) via eth1 servername dhcpd: DHCPOFFER on xx.xx....
0 votes
1 answer
363 views

IPV6: Ubiquiti Router, Ubuntu Client

I have a Ubiquiti router on which ipv6 appears to be working fine. The output of radvdump, along with various other relevant data, is below. My trouble is with ipv6 on an ubuntu 16.04 machine behind ...
-1 votes
1 answer
5k views

Two internet connections in one house - Wifi and DHCP

Before starting, I would like to mention that my knowledge on networking is very basic. Feel free to suggest improvements for my network setup in any part of my question. I have searched the site ...
0 votes
1 answer
3k views

Cannot access Web UI for Eaton UPS Network-MS card on 172.x.x.x network

I have an Eaton 5PX1500RTN UPS with a Network-MS card installed and I could access the Web UI when I first set it up during initial testing on a 192.168.1.1/24 network. I made sure that I used DHCP ...
2 votes
1 answer
3k views

DNS server for home network without using resolv.conf, google dns, nor transfers

I have tried using bind9 and dnsmasq. I also set the server machine to have a static ip address. The OS is Ubuntu 18.04. I want to access the domain on Windows 7 and 10 machines. I have tested, and my ...
0 votes
0 answers
114 views

Shall I give my secondary router a reserved IP through DHCP or ARP?

My primary router [192.168.100.2] has DHCP enabled through the addresses 192.168.100.3 to 192.168.100.200 - I have installed a wireless range extending router [192.168.100.3] with the same SSID at ...
0 votes
0 answers
978 views

Resetting Mikrotik RouterBoard 750GL

I've messed up some settings and now trying to reset this router, but the problem is, i can't. Or at least it seems i can't. I've tried to use reset button (turning it off, holding reset button, ...
1 vote
1 answer
474 views

Connect to friend in same network but different Ip? [closed]

I want to ping/file transfer to my friend whose ip address is 172.20.1.55 and mine is 172.20.64.69, we both r in same network of college but I am not able to connect.. college runs on cisco how can I ...

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