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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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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 ...
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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. ...
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1answer
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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 ...
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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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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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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 ...
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27 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 ...
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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? ...
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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, ...
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1answer
31 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 ...
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24 views

Network admin (probably) blocking wireless ap

I'm doing a project with my teacher which involves creating a wireless ap on a Raspberry Pi 3B so that some Raspberry Pi Zeros can connect to the network. I've tested this at school first and hostapd ...
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1answer
21 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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41 views

TP link router DHCP doesnt give range bigger then 256

I have a couple of TP link routers and none of them will give me range that is bigger then 256. I work at school and as we need more then 250 users I tried to setup router to /23 address format to get ...
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42 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. ...
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2answers
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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 ...
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1answer
23 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 ...
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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 ...
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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 ...
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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
43 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 ...
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Need to change my local network to a different subnet

I am needing to change my home network subnet to something different. I VPN into my works network but the IP I have is the same as my works network 192.168.1.*. I really don't know how to go about ...
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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 ...
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1answer
71 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 ...
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1answer
35 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 ...
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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 ...
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1answer
54 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 ...
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2answers
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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 ...
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1answer
46 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 ...
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1answer
46 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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1answer
45 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? ...
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1answer
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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 ...
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Ddwrt Different WIFI with different DHCP Range???

I have a netgear r9000 and I wanted to know if it is possible to create different wifi networks with a different DHCP Range. I would like to have a wifi network where clients get a VPN connection and ...
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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 ...
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33 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 (...
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2answers
64 views

Connecting two computers over LAN while contending with DHCP

Please excuse this question if this is on the wrong stack or if it is considered to be looking for service recommendations. I tried asking this over at Network Engineering however they don't deal with ...
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1answer
39 views

Default gateway has the same IP as the DHCP Server

Just out of curiosity, Is it normal for a default gateway to have the same IP as the DHCP server? I am running windows server with no roles installed, My IPs are dynamically allocated by the DHCP ...
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3answers
23 views

Is it possible to see a ping from a LAN computer to an unknown destination?

rookie question... Two computers in a home network connected only by Ethernet to a router. The router is connected to internet and gives the computer ip:s like 192.168.10.xx. One of the computers ...
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131 views

Can't obtain IP with Realtek 8821ae on Ubuntu 18.04

I'm having problems connecting to WiFi. I can see networks, but not connect. Facts I can see different networks available, but can not connect Ubuntu 18.04 (Kernel 4.18) dual boot with windows 10 ...
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1answer
34 views

How do I re-establish connectivity to the internet (cannot assign addresses now) after setting static ip in openbsd?

I recently asked a question on stackoverflow regarding not being able to push git commits from my OpenBSD (6.3) machine to GitLab, since changing it to a static IP. It turns out that the problem ...
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1answer
282 views

Static IP address of 255.255.255.255

I live in a house with a couple of housemates and I manage our internet connection. When looking in the admin panel of the router I saw that one device has set its IP mode to static and the console ...
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1answer
220 views

Assign a Static IP Address to a VirtualBox Guest with a NAT Network Without Accessing the Guest

I am using VirtualBox 5.2.18 on Ubuntu Server 18.04. I have several VirtualBox guests machines sharing a NAT Network intnet. Currently, intnet has a DHCP server (set up by VirtualBox) that ...
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0answers
174 views

No DHCP Reply on bridge with QEMU and TAP interface

I have a host machine running a virtual machine with QEMU and i want the DHCP server on the host providing an IP address to it. I am using static ethernet addresses for the guests, so i start them up ...
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1answer
175 views

Why can't I ssh to a local (single-label) hostname: “ssh: connect to host myserver port 22: Invalid argument”?

(I figured out this is related to nscd; please see the bottom of the question) I'm trying to connect to a headless server via my laptop; they share a wired link via a Linksys wireless router and TP-...
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3answers
78 views

NAS IP is outside DHCP Range - now cannot access it

I have a NAS-DS216j and it is not showing up on my DHCP list. As a result, I don't know what it's IP address is and cannot connect to it in a browser, or the Synology Web Assistant (http://find....
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1answer
54 views

Can't reconnect to Wi-Fi after disconnecting

I use Arch Linux and this is the command I usually use to disconnect from the Internet: sudo wpa_cli -i wlp2s0 -p /var/run/wpa_supplicant\ GROUP\=wheel/ terminate. To connect again, I use: sudo ...
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D-Link DIR-615 intermittently fails to respect static DHCP address assignment

I'm connected wirelessly to a DIR-615 wireless AP+switch+router. I get an address via DHCP and am able to connect, although sometimes getting the address takes a long time for some reason; and once in ...
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1answer
30 views

Sequence of events for WPA and DHCP when a station connects to an AP

I'm having issues with an embedded Wi-Fi device that is set up to act as a Wi-Fi access point. I've found with the AP at elevated temperatures a device (station) attempting to connect can have some ...
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1answer
50 views

WWAN and Wi-Fi connection priority on Raspbian Linux

I try set metric in DHCP in Raspbian to had bigger priority Wi-Fi over WWAN so I set: pi@adi:~ $ route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref ...
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1answer
174 views

How to update DNS AAAA record when SLAAC clients appear

I have a routed /64 from my ISP and I am running radvd. My clients (Linux, Windows) are working well without any additional configuration when they get plugged into the router. They all assign ...
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65 views

Ping between computers work randomly

I've decided to create some kind of working subnet. I've connected my main router (that's connected to the internet) to the second one and connected three computers on that one. For those three ...