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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why does my network disconnects from internet every couple of hours?

I have a broadband that here you can see its details. It provides wireless and also I got two more routers that use them as access points. DHCP is disabled on them and these two routers work are set ...
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316 views

Windows 7 RNDIS client sends REQUEST without DHCP server IP

My linux based board is running a DHCP server on USB0 port to assign a fixed IP to the connected RNDIS client. When I connect Win XP or Ubuntu machine with this board, host machine gets the fixed IP ...
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92 views

Two wireless extenders with same mac address…How to assign IP address dhcp

I have two wireless extenders, and they both have the exact same mac address (same make and model) Now, they work fine in the network, I just wanted to know how can I assign them specific IP ...
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719 views

dhcp static assignment doesn't clean bind after DHCPRELEASE

I've got a set of virtual machines inside VirtualBox on a OSX host. My Gateway-VM is Ubuntu 13.04 with 4 NICs. On this machine ISC-DHCP-Server and Bind9 are running and DDNS-updates work fine when ...
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187 views

Setting up VPN on Centos with router doing dhcp

I've successfully setup PPTP VPN on my CentOS 5 server and can connect to it. I've set it up to use the IP range 10.0.1.50-60 and this works and we can ping each other but from what I can tell these ...
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314 views

Does Windows internet connection sharing support DHCP reservation?

I have a rack full of computers connected to the internet via internet connection sharing (ICS) on one of the Windows 7 machines. Two Axis IP cameras are connected to the rack. Each time the system ...
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54 views

Negate global parameter in dhcpd.conf

Let's say I've got a DHCP server that will serve 10 subnets. 9 of the subnets will be on the "example.org" domain and one will receive no domain from the DHCP server. I set option domain-name "...
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103 views

Internet cuts out and cannot reconnect, DHCP not enabled

Sometimes the internet cuts out and then when I try to reestablish a connection it gives me limited connectivity where I can't access anything. The network problem diagnostic tool can repair the ...
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2k views

Embeded Linux device fails to get DHCP

I'm trying to get an embedded Linux device to use DHCP to get it's IP. I think it is trying, this is from the boot output: Configuring network interfaces: cat: can't open '/var/run/udhcpc.eth0.pid': ...
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165 views

Is there a way to tell the difference between a direct connection and network connection

I want to configure a linux(ubuntu) machine such that when a direct connection is made with another PC my machine will enable a DHCP server and serve it an IP address, but if my machine is connected ...
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712 views

Windows not recognizing local network domain name

I'm setting up a small network for a club that I'm a member of. The layout is a single server with two ethernet interfaces, connected to a wireless router and a wireless bridge. The bridge connects to ...
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56 views

Reserved DHCP Address, now can't access the interwebs

Pretty self-explainitory. Yesterday I reserved a DHCP address for one of my computers and now it cannot access the outside world. It can resolve domain names, but it cannot ping. This is probably ...
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2k views

Xen networking - bridging issues

I do love Xen as a product, but sometimes, I really hate it. I'm having some networking issues with one of my Xen clients sitting on a Debian 6 machine VM (so Xen is running inside a Debian 6 virtual ...
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560 views

How to set custom DHCP option in dhcp request in Windows XP?

DHCP client in Windows XP has built in options. One of them is Requested IP Address. How to set custom IP address into that field? Background: In my local network there is DHCP server that ...
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697 views

Windows 7 DHCP Client won't start

The DHCP server on my Windows 7 machine refuses to start, when I click start in the services control panel I get: "Error 2: The system cannot find the file specified." The 'Path to executable' is 'C:...
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330 views

OpenDNS servers initial response is very slow

I've got a Time Warner cable ISP package (RoadRunner), and the modem they gave me doesn't allow me to specify which DNS servers to use; it always uses whatever the upstream dhcp server gives it. I ...
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12 views

dnsmasq requires a restart of the networking system on BeagleBone Black (Debian 8.5)

I am currently trying to configure a BeagleBone Black running debian 8.5 as a WiFi Access Point. The programs used are hostapd and dnsmasq. I've made huge progress, in principle the access point is ...
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18 views

No internet when obtaining IP address automatically(static works) with HP 1910-8 switch

I can ping all VLANs from all VLANs in the switch. I can log into the router/gateway from all VLANs. I can even ping 8.8.8.8, for example, from all VLANs. I can only access the Internet from VLAN 1. I ...
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27 views

Windows 10 not getting ip from DHCP

My PC is running win10 64 bit. I don't know why it is not getting IP from the dhcp, I am sure it's configuration problem, It is getting an IP like 169..... Here is what I tried : 1. Changing router ...
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17 views

Android is not getting dhcp lease but server offers one

Android is not getting dhcp lease but server offers one. My Linux Mint 17 desktop gets an IP via DHCP (wired network). Do you habe any hints where the problem is possible lying? Where and how should I ...
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21 views

Simple DHCP server for just one device

I am building a small system that has one embedded computer and one ethernet device. The embedded computer has a fixed IP address (from the manufacturer), but the ethernet device uses DHCP to get its ...
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14 views

What is the proper setting to set Bufffalo DD WRT as Gateway and DHCP Server?

Consider the following diagram: Note also that all three units may have WiFi enabled each with its own SSID. I would like to make "B" into this network's sole Gateway and DHCP server such that no ...
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21 views

ADSL Teracom router permits only static IP connections to internet but not DHCP

I have asked this question elsewhere but I have yet to get a firm understanding of where the problem is - http://askubuntu.com/questions/773557/unable-to-trace-where-my-ubuntu-networking-problem-is I ...
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48 views

Windows Server 2012 r2 DHCP not serving addresses

Yesterday I encoutered a DHCP problem. After windows update and restart, my dhcp won't serve any new IP addresses. The ones wich has been sent before are working but no new IP-s. I tried restarting ...
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11 views

DD-WRT block requests from static-addressed computers

Hello i have a litle problem. I have moved into two floors house and need to use repeater. My network structure is linke on this picture: There are two routers, R1 (upper) is any D-LINK with ...
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10 views

VLAN - Tagging Query

I have a netgear switch and the following configuration is working. VLAN ID PORTS 1 1 2 3 4 5 6 7 8 10 1 2 3       7 8 20     3 4 5     8 Each port is untagged in ...
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24 views

Router won't re-offer DHCP

Wondering if this "as designed" or a bug in my netgear router. I have an AP connected to the router (via EoP) If i connect to the router SSID, get an IP then disconnect and connect to the AP SSID I ...
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15 views

two interfaces conflict when running two instances of CherryPy

I am running small database website on CherryPy (legacy, not mine codebase) for our lab at The University. We had production host and CherryPy instance (database.uni.edu, mapped to static IP xxx.xxx....
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15 views

automatic decision whether to be a DHCP server or client

Can a computer send DHCP request and if there is no answer became a DHCP server? My use case: I have new raspberry pi. I would like to show it to friends connect it in friend's house, in school, ...
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46 views

Debian 8.1. Needs restart eth0 iface to get connection

I have a strange problem with connection to Internet in my Debian 8.1. I change content file /etc/network/interfaces to iface lo inet loopback auto eth0 iface eth0 inet dhcp Now if I restart system ...
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33 views

Distinguish between DNS-requests from local network and internet

I am using DNSmasq both for my local clients and some internet services. One service I provide is a dynDNS server. It receives IP updates via HTTP and writes it as simple hosts file but without domain....
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22 views

Client not getting connected with reserved IP

We have DHCP running on Server 2012 R2 and reserved IP for fileserver in our domain. While booting after weekend, it is found that the reservation is inactive. The reservation was deleted and found ...
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32 views

DHCP: Temporarily Reserve An IP to A specific Mac or machine for a specifc time

I m using OPENWRT DNSMASQ/ every machine should have a Dynamic IP.(it is OK) after that he gets a captive portal page to enter credentials. ( it is done too) Question is If credential is ...
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37 views

Extend MI424WR Rev I wifi range with Netgear R6200v2

I'm a fios customer and I currently have 2 of MI424WR Rev I routers and a netgear r6200v2 router. I'm currently using one of the MI424WR Rev I to connect to Optical Network Terminal (ONT) and it gets ...
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45 views

Upgrading from isc-dhcpd-4.1.1-P1 to isc-dhcpd-4.3.3-P1

I am looking to update my DHCP servers with failover associations configured, running isc-dhcpd-4.1.1-P1 to isc-dhcpd-4.3.3.3-P1. I found documentation on ISC's site when upgrading from 3.X to 4.X ...
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45 views

dhcp server or routing rules on a lan with internet server

I have two machines : Imac with Mac OS 10.9.5 & a Debian 8 server headless both have one ethernet interface and one firewire. The DHCP is still on the router and has statics ip address, the two ...
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104 views

Wireless Network Connection not getting IP address assigned by DHCP

I have an issue with my Windows 7 laptop such that, whenever I go to change IPv4 settings through respective "Network Connection property" dialogue boxes for each network interface, I always get this ...
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14 views

Sharing internet connection over LAN (Windows 8)

I have: PC (Windows 8) connected to the internet via WLAN. POS payment terminal connected to the PC via LAN (UTP). I would like to share internet connection to the POS payment terminal. The PC ...
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131 views

Pass the ISP DNS to your DHCP clients on OpenWRT

Basically I need my DCHP clients to have their DNS pointing to the ISP ones rather than pointing to the OpenWRT/Router's IP. On (latest) DD-WRT, you can check the option to disable DNSMasq local DNS, ...
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80 views

Can't get Pi/Debian to renew DHCP on boot

I recently tried getting my Raspberri Pi/Debian going with WiFi. That was a bust and seemed shaky, so I want to go back to regular wired. But not I cannot get a eth0 connection going for some reason. ...
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127 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, ...
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189 views

D-Link DSL2740u router shortfalls

I have a D-Link router (DSL-2740U) Hardware version: V1 Firmware Version: ME_1.02 I'm really struggling to get my home network set up the way that I want. The IP range is 192.1668.0/23 with my "...
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50 views

How to remotely set up IP cameras?

I'm trying to set up a CCTV system at my parents' house. Most of the networking is done already (I think), but I still need to set up most of the ~30 cameras. This is the network topology: internet &...
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171 views

Wireless lease always expiring. Asus ADSL N10E modem

So heres the problem. My wireless modem doesn't connect properly with my Mac. I have some 6 devices that connect wirelessly to the same modem and the strange thing is, all Windows laptops work ...
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58 views

Access Router without DHCP in network

I have a router with enabled DHCP server. I also have multiple switches and Wlan access points, which are cheap TP-Link Wlan routers without a DHCP server connected to the network with a LAN port. ...
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138 views

ISC DHCP Spamming /var/log/messages

I recently setup a Linux box to run a DHCP server. One of the prerequisites was to get all of its log messages onto a specific file outside of the /var/log folder. For that purpose, I inserted the ...
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145 views

wlan0 interface fails to fetch IP with udhcpc

I am using USB Wireless Adaptor of Realtek in Android Lollipop with RTL8192DU driver. I am able to scan the wireless network using iwlist wlan0 scan command . And I tried to connect to an open network ...
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35 views

How to get clients' names into the caching DNS-server?

Scenario: small home/workshop network (behind NAT), one Linux server running Samba 3.6.6 + DHCP-server + pdns-client (caching dns), some 2-3 workstations (Linux + Windows) and some 2-5 units (Android ...
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47 views

DHCP Server and WINS Server Sharing Same IP

I have been trying for a couple of weeks now on an Ubuntu system to try and run the machine as both a WINS server and a DHCP server - is there anything that would stop this from working? I just don't ...
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62 views

Network configuration to enable two gateways (ISPs)

I'll try to explain this clearly, but it's complex. My ISP (ISP1), who shall remain nameless, has reliability issues. I have a second one (ISP2), as a backup and for heavy traffic. ISP1 is Gateway 1 ...