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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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2answers
15 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 ...
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1answer
16 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 ...
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0answers
13 views

Notebook picking up IP 169.254.x.x, DHCP does not work [duplicate]

I am having problems with the wired connection on my notebook. He is picking up the ip: 169.254.28.213. DHCP is not working and ** static IP is not **. I set the static and it still does not work. I ...
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0answers
23 views

DHCP issues with TP-Link Archer C9 router

My Archer C9 router usually woks well, but in certain cases, I've had to interfere with its normal DHCP operation. For example, it first came up with Roku players, where they would connect but not be ...
1
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1answer
24 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 ...
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0answers
10 views

Can isc-dhcp-server and dnsmasq coexist?

After two days of trying to configure dhcp on dnsmasq and failing, I'd like to go back to isc-dhcp-server, and only keep dnsmasq for dns. Can the two coexist well? is there anything I need to pay ...
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0answers
29 views

Ubuntu not getting ipv6 address automatically

I'm running Ubuntu Server 18.04 and for some reason it's not getting a global IPv6 address on startup. It has a link-local (fe80) address on ens18 (ethernet interface), but not a global one. To get ...
0
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1answer
83 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 ...
0
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1answer
54 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/...
1
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1answer
34 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 ...
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0answers
17 views

dhcp / iptables: Evil Twin gives wifi but does not send user to my website

So I set up an Evil Twin AP and when a user connects, it transmits wifi data and all of that but it does not initally send the user to my fake website on apache2 localhost port 80. Here are my configs:...
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0answers
33 views

Intermittent connection on centos on clean install - logs point to christian polyamorous society IP?????

I am getting an intermittent connection when fresh PXE installing centos 7.5.1804 with digital rebar though I don't believe this has anything to do with the method I am using to install the OS. Works ...
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0answers
5 views

DHCPd taking a long time to start up after replicating server

We recently copied the configurations from one server to another as part of an effort to improve the particular server's reliability. When we attempt to turn on the DHCP server on the new server, it ...
2
votes
1answer
47 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. ...
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0answers
19 views

Unable to connect to AP

I am using Ubuntu Bionic OS for my NanoPi M1 plus device. I have made a wifi router operating in 2 modes. eth0<-->wlan0 & wlan1<-->wlan0 I am able to start the AP using the wlan0 interface ...
0
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1answer
38 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
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1answer
538 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 ...
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1answer
27 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 ...
1
vote
1answer
29 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
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2answers
41 views

Change DHCP server from ISP modem to network router

I have an ISP provided DSL modem/router (Archer) that is currently configured as 192.168.1.1 and acts as the gateway, DHCP server, and the DNS settings are also stored there. I also have my own ASUS ...
0
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2answers
62 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 ...
0
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1answer
63 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. ...
0
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1answer
44 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 ...
1
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1answer
69 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....
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0answers
249 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+. ...
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0answers
19 views

How to make dhclient close 68 port automaticlly after configured DHCP done?

On my linux host(Debian 9), the NetworkManager service startup on system boot, and it run dhclient command to obtain ip address through DHCP protocol. But while it has configured ip address done, the ...
0
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1answer
32 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
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1answer
46 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? ...
3
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0answers
290 views

Internet connection drops every 10 minutes (exactly)

Since I've moved to a new apartment a few months ago and changed my I ISP (the one shared with other apartments in building - same router) I experience internet drops (ethernet) every ten minutes, ...
0
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1answer
50 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
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1answer
30 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 ...
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0answers
74 views

Error when trying to install DHCP server raspberry pi ssh

I'm having an issue; I'm trying to convert my pi into a router but I'm having an issue installing isc-dhcp-server The pi is plugged into the modem via ethernet and I'm connected to it via ssh -> wifi. ...
16
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2answers
2k 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 ...
0
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1answer
36 views

Error - data loss - with dhcp client lease - Ubuntu 18.04.1 LTS

Since I have upgraded to the latest version of Ubuntu 18.04 LTS version, I started having an annoying issue with my internet connection over any wireless network I try to connect to. What is happening ...
1
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2answers
44 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 ...
0
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0answers
19 views

How to access the primary router through DHCP of a secondary router?

I have a primary router, mainly an ONT. It is configured to be in Bridge Mode with its LAN port connecting to the WAN port of the secondary router, within the range of the primary router's DHCP. This ...
0
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2answers
52 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....
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1answer
61 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 ...
0
votes
1answer
21 views

ISP DHCP takes precedence over WiFi DHCP

I've TP-Link Archer c9 router. It connects to the Internet through Dynamic IP (DHCP from ISP). No MAC clone or other authorisation is necessary, it just work. DHCP is enabled on the WiFi router. But ...
-1
votes
1answer
147 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
1answer
79 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 ...
0
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0answers
27 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 ...
1
vote
1answer
171 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
2answers
65 views

Why does my internet connection work even if my ipv4 is 169.x.y.z? [closed]

I'm still fairly new to network diagnostics and was snooping around when I saw comments about checking if your ipv4 was set at 169.x.y.z to know that the network issues revolved around the router not ...
0
votes
1answer
62 views

fritz.box faulty hostname resolution after (presumably) dhcp renew

I have a macOS 10.13.6 client connected to Fritz!BOX running Fritz!OS 06.83 Suddenly, an application using TCP stopped working, and I traced down the cause to this: $ hostname myself.fritz.box the ...
1
vote
1answer
47 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 ...
0
votes
1answer
49 views

Dynamic DNS registration of a client by the DHCP. How is the record updated?

With dynamic DNS where the clients are registered by the DHCP server, I cannot figure out, from where the DHCP server gets the clients name? I mean the DHCP server just offer clients ip-numbers right? ...
1
vote
1answer
68 views

Reserved IP address taken by another device

How is it that on a local area network with a router that allows IP address reservations (exempting the special situation that a static address is assigned to the different device) that a completely ...
0
votes
2answers
106 views

Trying to understand DHCP for my particular situation

Although I have read articles on networking, I still fail to understand it practically, so I would very much appreciate someone explain my questions. (I know the theoretical definitions, I just don't ...
0
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0answers
58 views

DHCP Requests not being forwarded on wireless bridge with Tomato Firmware

I have a Tomato Router set up as a Wireless Ethernet bridge. The DHCP Requests do not seem to be getting forwarded to the Gateway. I am able to assign a static IP to anything behind the Tomato Router (...