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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Autoresolve a hostname via “closest” network - how?

Having all linux(redhat) machines always on one VPN network and moving them between different LAN networks, how to setup hostname resolution(/etc/resolv.conf?, and DHCP server?, and DDNS server?, and ...
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99 views

Could not start DHCP client on windows 7 home premium. Error 5 access denied

DHCP client didn't start automatic. Trying start from services: Windows could not start the DHCP Client service on Local Computer. Error 5: Access denied. What should be fixed please?
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18 views

With new DNS settings, certain webpages break

I administer the network at a school. I recently changed our router's DHCP settings to use the DNS servers 208.67.222.123 and 208.67.220.123, the former of which is the OpenDNS FamilyShield server. ...
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20 views

What should /etc/dhcp/dhcpd.conf look like for a single router when configuring shared-network

Hi I'm just doing some tutorials to learn about networking, and I came across segregating a safe and unsafe network with DHCP using isc-dhcp-server This is what my config file currently has: ...
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63 views

Java permissions & CLSID for an Agilent 34980A multiplexer unit

I am using a 34980A unit as a multiplexer, that requires Java to view the multiplexer switches through an Internet browser. To operate the instrument I have to be offline and use DHCP, to enable the ...
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71 views

Netgear WNCE4004 Wifi Adapter Connection Trouble - Static IP Issue?

Here's my situation: I'm in the military and live in an accommodation block where internet is provided by an unprotected wifi network (I'll call this 'service wifi'). To get internet access, I login ...
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18 views

ddclient updating to public IP instead of private IP

This is the antithesis to question 389125 I have private services (apache, ssh, synergys for example) accessible on a desktop on the local network. This is not with centralised login (ldap/AD for ...
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86 views

DD-WRT to push alternate Name Servers to clients over DHCP

In order for WiFi DHCP clients to use directly 8.8.8.8 and 8.8.4.4 as name servers, DD-WRT has been configured as follow add dhcp-option=6,8.8.8.8,8.8.4.4 in /etc/dnsmasq.conf (reboot) since that ...
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127 views

How to set up Networking and DHCP in windows server 2012 inside VirtualBox?

Background: Three operating systems are installed inside VirtualBox: Windows Server 2012 R2 Windows 8 Pro Windows 8 Enterprise So, I want to set up the Server 2012 R2 as Domain Controller, DHCP, ...
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14 views

dhcpd3 not reusing IP for mac

I have an ip range with two ip-addresses defined as follows in my dhcpd.conf: subnet 192.168.1.0 netmask 255.255.255.128 { range 192.168.1.10 192.168.1.11; default-lease-time 600; ...
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39 views

How does DHCP work when it's not “between” your modem and devices?

I've been looking into different options for running some services on a home server. One such option is Amahi. During the setup process they recommend shutting off any other DHCP server on your ...
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7 views

Cisco 1131AG: Wireless clients randomly unreachable

I have a weird issue with my 1131AG-E-K9. I set up a lab at home to get back into the topic after a few years break. My 1131AG is connected to one of the PoE ports of an ASA5505. Clients are 2 ...
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43 views

Split current network installation in two Vlans

here I got a (really) tricky problem In my home I have a basic router from my ISP and the DHCP Server that serves every mac address with a static IP in this configuration : Family devices : ...
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129 views

Windows 7 DHCP flooding server with requests

Am attempting to connect a Windows 7 laptop to a Debian server running dnsmasq. The Windows 7 machine doesn't seem to like the DHCP info it's getting as it re-requests it every ~10 seconds. The log ...
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40 views

DHCP configuration for local DNS server

I have a server at home with several other computers/devices using DHCP to connect. The DHCP service is provided by the router. My ISP gives me a dynamic IP address so I use no-ip to get a fixed DNS ...
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68 views

Arch Wifi - Connects but doesn't stay connected

Arch x86_64 (plain install on mSATA via USB) Linux 3.17 NetworkManager DHCP enabled at boot via systemctl Generally, the host computer is a Surface Pro 1 w/ Marvell Avastar Wifi Card and connected to ...
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58 views

Networking a small office with VPN

Recently I purchased a CISCO RV042 Small Business router with VPN Capability, obviously to allow external connection to this office via VPN to access a NAS where business files are stored. I am not ...
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121 views

D-Link Powerline AV500 Issues? One Powerline LED green and the other one not lit? Maybe also messing up DHCP?

A few times now I noticed while one of my Powerline adapters has a solid green LED, the other is not even lit. I understand the oscillation in my electric circuit influences the quality of the signal ...
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69 views

LTSP server with existing DHCP Server

I want to setup a LTSP server on the computer that is already a DHCP server. I'm using zentyal 3.4 on the server, it's basically an Ubuntu 12.04 with zentyal-core installed on it. I have instaled ...
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271 views

CentOS 7 can't get IPv4 address from DHCP server

I have classroom full of computer running CentOS 7 and only one computer can't get IPv4 address from DHCP server during boot, because NIC is not yet up, when dhcp client tries to get IPv4 address from ...
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31 views

Strange IP settings issue

Friend of mine is having a puzzling issue I've not come across before. Windows Vista box, logs into an SBS2003 domain controller @ 192.168.1.50. The first time the issue popped up (about two months ...
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19 views

Change DNS to dynamic but NOT if IP is static?

I know I can use the netsh command to change DNS settings from static to dhcp, but does anyone know a way to tell it to do nothing if a static IP address exists?? Example 1) PC1 has a dynamic IP ...
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29 views

Special type of DMZ?

So I have a standard modem-router setup all great to go, my Modem gives an IP Address from my provider via DHCP according to my Mac address. All is good. However, I now want to expose a new virtual ...
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84 views

Can't find my router in bridge mode

I got a new router that supports WDS to extend the reach of another router that supports WDS. After a fair bit of struggle, it works, but I have to disable DHCP in the new router for WDS to work, and ...
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221 views

Can't add static lease from inside DHCP range in pfSense

When trying to add my computer to static lease, I get the following error I don't understand the reason for this. If I would want to assign IP from outside DHCP range, I would assign it statically ...
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30 views

Can't acess WinXP from Win7 on domain

I have a Windows 7 computer and I can't access any windows xp machine using their computer name directly. eg. \\co01 but I am able to access them using the IP address e.g. \\192.168.0.55 So I need to ...
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59 views

How do I create a DHCP server, with a router that doesn't allow me to disable DHCP?

I have an Actiontec V1000H Modem/Router from my ISP Telus, they have blocked access to all their 'advanced' settings like DHCP/Bridging. I have setup a MAAS server I have a few things I'd like it to ...
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72 views

Zyxel P660H-D1 Bridge without Default Gateway (N/A)

can someone help me? i have a configuration from old Modems, and i wanna configure new one, as same. The Config must be so: Bridging! WAN Information - DSL Mode: NORMAL - IP Address: N/A - IP ...
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76 views

Dilemma about how my wireless devices obtain IP address

Currently in my network there are 7 wireless outdoor equipment and 1 switch . This switch act as backbone switch for my network as internet supply from ISP is connected to this switch. Through this ...
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50 views

PC Laptop not grabbing a DHCP address from Apple Time Capsule

All of the Macs on my network are acquiring a DHCP IP address via Wi_Fi just fine. Multiple PC laptops are not obtaining a DHCP IP address from the Wi-Fi network. They do successfully join the Wi-Fi ...
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35 views

Windows DHCP vs third party DHCP software/tools

I would like to know, what are the benefits of using other third party DHCP software compare to Windows DHCP. What are the advantages/disadvantages or is there any limitation since Windows DHCP ...
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14 views

Revoking a dhcpv6 address lease

Is it possible to revoke a dhcpv6 address lease before it expires? For instance, if the prefix changes, is it possible to distribute new IPv6 addresses?
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129 views

DHCP letting multiple devices get same IP address - how to trouble shoot?

I am using a win2008 server with AD to also serve DHCP and DNS. I have some wifi AP's that are giving me trouble (dropping connections and generally misbehaving). The issue that I notice is that the ...
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105 views

How can I delete old IP configurations received via DHCP on Windows 7?

I noticed in the log of a DKIM verifier plugin for Thunderbird (that retrieves DNS servers to query from the OS configuration) that my Windows registry still has IP addresses for name server that ...
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93 views

dhclient not working for

I tried to get a IP address for eth0 via dhclient, but it hangs forever. Please help me find out what's wrong. I am running it inside a virutalbox guest machine. There're two interfaces, eth0 and ...
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31 views

Prevent DHCP Lease Updates From Adding Gateways

I am having a problem preventing DHCP Lease Updates from modifying my route table in Windows. My issue is that I am routing all my traffic through a VPN and purposefully delete the 0.0.0.0 route ...
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176 views

multiple DHCP servers for wireless users on same subnet

I am trying to set up 2 router in our network with following set up. 2 routers, 1 is the main router that DHCP is enabled to assign ip to all wired PCs, the other one can be assumed for guest, which ...
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71 views

/etc/ethers is not being read by dnsmasq

I recently configured dnsmasq on Raspbian, and everything was working perfectly except that /etc/ethers wasn't being read (yes, I did uncomment read-ethers and remember to restart dnsmasq) - the ...
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124 views

(Windows 7)Bridge: (tap+wifi) -> ok, (tap+ethernet) -> dhcp is not working. What are possible problems?

All this happen on win 7. I set up the ovpn bridged connection with wifi+tap bridged, and it worked fine. Now I need to make it use ethernet instead of wifi, but bridging of ethenet+tap has issues: ...
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222 views

Windows Wireless Hosted Network (aka: Hotspot) - Port Forwarding and DHCP

I'm on Windows 8.1 and have been experimenting with the Wireless Hosted Network feature, aka: "Turn my computer into a WiFi Router". It wasn't hard to turn on, set an SSID and WPA pass, but now I'm ...
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232 views

How to create a dhcpd.conf file

I have followed the tutorial on this page to create an access point on an Arch Linux install. It seems that went mostly ok apart from an error from DHCPD server: Internet Systems Consortium DHCP ...
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231 views

How does my ISP knows that I am sharing my internet connection? and how to bypass it?

I am in a student residence hall.There is one ethernet socket in the room. I can connect my laptop to the cable, but how can I get internet in my iPad? It will be good to have internet on both of ...
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27 views

Script to email administrator when a duplicate IP is found on the network

I know this is a bit of a custom requirement but I was hoping someone currently has (or can put together) a script that checks for duplicate IP addresses on a network (something that might occur when ...
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21 views

DLink 614+ Connect two LANs

I have a DI-Link 614 router. As WAN connection I have a LAN which has access to internet and I do not manage it. I have 2 computers (PC1, PC2) and 2 devices connected to the router. I have ...
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163 views

Internet slow down after Setting up Domain Controller on VM

I running Hyper-V on 12 computer and windows server 2012 on 1 computer. I set up 2 Virtual machine Domain Controller on 2 separate computer. The second one is just a failover read only DC. My whole ...
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23 views

Additional ip addresses along dhcp

On windows it seems possible to add arbitrary ip addresses on the interface, but as soon as you add one, the addresses obtained with DHCP is removed. Is it possible to set static ip addresses while ...
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524 views

IP attributed with Microsoft Virtual Wifi Miniport Adapter

I created a "Wireless Hosted Network" using this very helpful command : netsh wlan set hostednetwork mode=allow ssid=YourVirtualNetworkName key=YourNetworkPassword (It is a very interesting ...
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82 views

How to setup private network using 2 routers with the following setup, one with ddwrt: internet modem > router > router?

I just purchased a DDWRT router with ddwrt v24 installed. Now I have a regular netgear router (R6300) that is connected to an internet cable modem. Internet Cable Modem > Netgear Router > DDWRT ...
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135 views

Relinux Live CD - waiting for network configuration

I installed ubuntu 12.04 base system via minimal ubuntu iso. I make a script to get hostname from dhcp server which explained here. It works perfect. I don't install network manager because I dont ...
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448 views

Windows 7: can I renew DHCP lease through GUI?

In Windows XP, there was a GUI option within each network interface to renew the DHCP lease of the interface. Does Windows 7 Professional no longer offer a GUI to renew DHCP? Else, how and where do ...