Dynamic Host Configuration Protocol; allows computers on the same network to automatically obtain unique IP addresses and other network configuration parameters.

learn more… | top users | synonyms

1
vote
2answers
504 views

Linux not resolving linux hostnames but does resolve windows hostnames

I have a network of computers, mainly Windows machines on a windows domain. I have 2 Linux machines, which are connected to the network and get their IP's via DHCP from the Windows 2003 server. My ...
1
vote
2answers
803 views

Can a DHCP router with MAC address whitelist be hacked with a VM?

I locked down my whole network’s MAC addresses so that only CPU’s on the whitelist can get an IP from the AirPort Extreme DHCP server and router. Well, guess what. A Mavericks VM with a completely ...
2
votes
2answers
527 views

Cannot reach the computer in WAN

I wanted to split the internet connection in my room. And my brother also wanted a better wifi accessability. So we bought a router (NETGEAR JWNR2010v5). All we wanted works great, good wifi. I have ...
0
votes
2answers
139 views

Running DHCP for ipv4 and ipv6 on different servers in the same network

I have a network where ipv4 addresses are assigned via DHCP on the router. The router, however, is capable of routing ipv6 but does not support ipv6 DHCP. Would running 2 DHCP servers (one for ipv4 ...
0
votes
0answers
75 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 ...
0
votes
1answer
69 views

How to create a DHCP server at home

I'm running Ubuntu 14.04 LTS on my server I have at home (just an old computer) I installed MAAS and I have a few netbook images I'm trying to boot, I have created a node in maas, but when I boot my ...
0
votes
1answer
25 views

2 dhcp server with one pool

I want to know if there is an option to have two DHCP servers with one pool. The reason for this unorthodox setup is, I have two router in remote locations on the same LAN (10.0.0.0) And sometimes, ...
1
vote
0answers
208 views

Why does “sudo ifconfig eth0 down” followed by “sudo ifconfig eth0 up” stop dhcp?

I am playing around in Ubuntu 12.04 trying to learn about networking. I learned that you can delete a network interface by running sudo ifconfig name_of_network_interface down However, when I do ...
0
votes
1answer
129 views

Server 2008 VPN isn't working, DHCP coming from a different source

Alright, I have a Windows 2008 server running. It serves up DNS but not DHCP. I want to have VPN running on it, and my understanding is that you can do this as long as you set the DHCP relay server ...
1
vote
1answer
31 views

Difference between configuring DHCP and starting service

On http://technet.microsoft.com/en-us/library/ee441263(v=ws.10).aspx, it says to configure and start DHCP on server core, do the following: At a command prompt, type: sc config dhcpserver start= ...
2
votes
3answers
12k views

Why can't my router connect to Internet?

I have UPC internet connection (chello.pl). My router is D-Link DIR-300. When I use provided modem to connect to the internet there is no problem. When I try to do it via router, I can't get a ...
0
votes
1answer
258 views

Ubuntu getting wrong hostname from DHCP

When provisioning new Ubuntu Precise (12.04) servers, the hostname they're getting seems to be generated from the DNS search path, not a reverse lookup on the hostname. Take the following ...
0
votes
0answers
94 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 ...
0
votes
2answers
218 views

Two IPv4 adapters in same PC on same network valid?

Is it valid to have two network adapters on the same PC have the same network portion in their IPv4 address? If not why is my DHCP server doing so and how should I setup my DHCP server to have it ...
1
vote
2answers
364 views

Why can't I get an IP address when switching access points until I reset the DHCP server

I read the article How can I get the same SSID for multiple access points? which is exactly how I set up my network. My main router with built in wifi, functions as DHCP server, then I have 2 ...
1
vote
4answers
3k views

2 routers, both DHCP, no IP assigned

I can't get DHCP to assign IP to my wireless devices. My network config is as follows: Nanostation5 Linksys WRT350N, which is connected with Nanostation via its INTERNET port. Nanostation: LAN ...
0
votes
0answers
77 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 ...
0
votes
0answers
67 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 ...
0
votes
1answer
289 views

Is IPV6 blocking my DHCP on Fedora?

I’m running Fedora 20 with KDE on a laptop I use for work. When I’m at home I use DHCP and when at work I have to statically assign an IP. When I came home the other day for some reason it doesn’t ...
0
votes
2answers
528 views

Linux NetworkManager not writing resolv.conf or running dhclient

I'm on a ubuntu based linux distro (linaro) running xfce. My networkmanager connects to wireless access points, but is unable to do two things: dynamically acquire a nameserver, and write a dynamic ...
3
votes
1answer
4k views

Ethernet connection shows unidentified network with no internet access

For years I've used a physical Ethernet connection for my internet access, then a few days ago it went down and said it was an unidentified network with no internet access. I dug out a wifi card and ...
0
votes
2answers
69 views

How to detect the presence of network devices without assigning an IP address

I want to be able to detect if a certain device with a given MAC address is on the network, without requiring that the testing device's interface has an IP address at all. One way I could do it is by ...
2
votes
0answers
104 views

Removed VirtualBox DHCP still offers addresses. Why? How can I make it stop?

I have VirtualBox installed on a Windows 8 host. I was using the VirtualBox DHCP server for a while, but now I'm trying to switch over to a DHCP server installed on one of the guests. The VirtualBox ...
0
votes
0answers
38 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 ...
0
votes
3answers
60 views

What specific roles does firmware play on routers?

If routers properly implement standard networking protocols (DNS, DHTCP, TCP/IP, etc.), then wouldn't the same firmware (implementing these protocols) be applicable to all routers? I guess I'm ...
0
votes
0answers
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?
0
votes
0answers
155 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 ...
0
votes
1answer
922 views

Netgear DHCP server doesn't provide the inputted dns servers to the connecting computer

I have NETGEAR JWNR2010v3 Router and I have configured it to static IP provided by the ISP. I have configured the preferred and alternate DNS servers provided by the ISP into the router. When I ...
1
vote
0answers
162 views

custom dhcp client on windows -manualy send discover and request packets?

My ISP has lease time 1 minute on its wifi connection. It basicly means that my system constatntly resets interface while setting same IP over and over on IP. When I set IP, gateway, netmask manualy ...
0
votes
0answers
144 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 ...
0
votes
2answers
98 views

How to configure Windows 7 to disable all network interfaces before hibernation and enable them on waking up?

Whenever I hibernate my laptop at home, go to the office an wake it up there I get an IP address conflict warning. IP is configured by DHCP (without any MAC binding) at both places so I think it would ...
1
vote
1answer
4k views

Active Directory Domain Controller with pfSense as DHCP and DNS server

I've read some conflicting posts, so hopefully I can get a clear answer. I have pfSense running as a DHCP server and DNS Forwarder. I'd like to try out Active Directory as a Domain Controller at home ...
2
votes
1answer
390 views

Will Windows renew IP address sometime after “ipconfig /release”?

On a Windows 2000 PC, I did a "ipconfig /release" to disconnect it from the network. After about 6 hours, I checked it again and it was still disconnected. But then about 17 hours after that, I ...
1
vote
1answer
293 views

Ubuntu failing to acquire IPv4 over I217-V, Windows failing do the same over a USB Ethernet adapter

Just installed a fresh copy of 14.04, and ran into a very upsetting issue, which I wouldn't expect to encounter in 2014: Ubuntu refuses to work with my integrated network controller - Intel I217-V. ...
0
votes
2answers
197 views

How to resolve physical device for home LAN's 10.0.1.1?

Main question How can I find out the physical device corresponding to 10.0.1.1 (in my home LAN)? (I tried dig, which gave no physical device info, and nslookup and host, both of which failed. ...
0
votes
2answers
212 views

dhclient can't get ip address

I have two interfaces: eth0 and eth1. eth0 gets ip address upon bootup, but eth1 never gets ip address. Here's what I get with sudo dhclient eth1 Internet Systems Consortium DHCP Client 4.2.4 ...
0
votes
2answers
1k views

SSHD reverse mapping fails, but nslookup, dig, and host resolve correctly

I just set up a dhcp/dns server to manage my home network. After I got everything up and running (and maybe before - I wasn't paying close attention), I noticed that logging into ssh was slow. I ...
5
votes
3answers
3k views

Where does “Client Name” come from in the DHCP client table on router?

I have a Cisco router. The firmware webpage has a tab the displays the DHCP client table. As the name suggests it lists all of the DHCP clients on the network. The first column in the table is the ...
0
votes
2answers
299 views

Static IP hosts on WiFi router with DHCP

I have two wired hosts (a desktop and a laptop) connected to a router that also has a DHCP server enabled for WiFi access. When I restart my wired machines, they get assigned a secondary IP address by ...
1
vote
2answers
313 views

Joining client to Server in VirtualBox

Having installed the trial of Server 2012 and a copy of Win 7 Pro in VirtualBox, I now need to join them together so the client can be in the domain of the server. I need to deactivate dhcp within ...
3
votes
3answers
7k views

What happens when router has been set to incorrect time?

I have a D-Link router for my home Wi-Fi network. Everyday at least once the internet suddenly goes down. I am simply not able to connect to the Wi-Fi network. If I just restart the router, it starts ...
1
vote
0answers
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': ...
0
votes
0answers
141 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 ...
0
votes
0answers
33 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 ...
1
vote
5answers
419 views

How to resolve odd behavior on wireless router, connections hang until DHCP lease is renewed

I just picked up a new wireless router and I am seeing the following odd behavior and I'd like to understand what could cause such a thing: After having internet connectivity through the wireless ...
1
vote
0answers
78 views

Does a flexible (e.g. DHCP) Windows multihomed wifi adapter configuration exist?

Given Location Configuration Internet & wifi modem address: 192.168.0.1 no DHCP iDrac remote server access: 192.168.0.250 Firewall router with NAT: 192.168.0.254 -> 192.168.5.0/24 DHCP & ...
-1
votes
1answer
51 views

How can my server announce its presence to everyone in the network [closed]

The situation is as follows. I want to have an application running on a server. All of the desktops in the company has to connect to it. But I do not want the IP address of the server to be hard coded ...
0
votes
1answer
4k views

Two VirtualBox VMs running in parallel assigned same IP

I had one VM in my VirtualBox and wanted to use it as a template/image so I cloned it. Then I launched both the original and the clone simultaneously (to simulate a server cluster for something I was ...
0
votes
0answers
198 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 ...
0
votes
0answers
86 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 ...