Tagged Questions

Dynamic Host Configuration Protocol (DHCP) allows computers on the same network to automatically obtain a unique IP address.

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How to forward DHCP broadcast messages between two interfaces using ebtables?

I have two interfaces, WLAN and LAN, on my linux system. How can I "forward" DHCP broadcast messages received on WLAN to LAN using ebtalbes?
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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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0answers
23 views

PC's and Laptops get IP from DHCP, but other devices don't?

We're having a strange issue. DHCP is setup on a Windows 2013 Server PC, it works fine for laptops and computers, even VoIP phones. But not for our access point (or devices connecting VIA the access ...
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26 views

Kickstart file not being received - rocks cluster

We are setting up a rocks cluster. We have one compute node directly connected via a cat5 ethernet cable. Rocks is installed on our main node, and we are trying to install a compute node. The node is ...
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20 views

How can I configure one of the ubuntu desktops as “dhcp-relay-agent”?

I have two Ubuntu desktops U1 and U2. U1 is connected to a DHCP server using wireless LAN and U2 is connected to U1 using LAN cable. How can I configure U1 as a dhcp-relay-agent so that U2 can also ...
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1answer
30 views

Routers Upstairs / Downstairs, allow them to talk?

I recently installed another router upstairs because the downstairs one didn't reach via WIFI. The second router takes its WAN connection from downstairs (I only have 1 physical connection to the ...
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0answers
28 views

Multiple DHCP servers and clients on multiple VLANs [on hold]

could you please help me with the following question: Describe the server process and the packet by packet communication in an environment that has multiple DHCP servers and clients on multiple VLANs. ...
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2answers
30 views

How can I find any additional DHCP servers that may have been installled on my network by an intruder?

See this question for background: Is it possible to hide one's presence from the DHCP client list nmap finds all connected clients for me, and I haven't had any trouble on this front since ...
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14 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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1answer
31 views

Is it possible to hide one's presence from the DHCP client list

I ask because I recently changed my WiFi password after seeing some unfamiliar devices in the DHCP client list. After that, the client list only has familiar names now, but there is still some ...
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13 views

Static routes in ISC DHCP

I have an Ubuntu 14.04 server at home running bind and ISC DHCP. Bind is caching from unblock-us.com so that I can get access to US Netflix content. This all works fine. I'm running into trouble ...
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1answer
18 views

Defaultgateway do not detect MAC-addresses

Today I was experimenting a bit with the user interface of my cisco router that is the default gateway of my LAN-network. I have two computers and a couple of smartphones atached to it trought WIFI ...
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74 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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0answers
28 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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22 views

How to simulate “global hosts file” on my LAN?

I would like to access machines on my LAN by names. Not with fully qualified names, but with names. Some of machines are Windows, another are Linux. All of them are obtaining IPs over DHCP, some of ...
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1answer
46 views

Hostapd. Devices disassocated even before connected

I am trying to create an Access Point with Hostapd in my laptop, which is running Debian 7.6 (wheezy). The laptop intended to be the AP is connected to the Internet via Ethernet (eth0) with static IP ...
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2answers
102 views

Windows Server 2012 - DNS and DHCP not working on client computers

Help me guys, my dns and dhcp server not working anymore. I used it for more than 2 months but then suddenly all my client computers can't get ip address but still dhcp in my server is running. I ...
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3answers
36 views

Use DHCP to only assign specific ip addresses to certain host names

Good Evening Everyone! Background: In my environment we currently assign all IP addresses manually because we are required to maintain a list of all ip addresses and what computers they go to. My ...
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1answer
36 views

Basic DHCP Leasing

I have really basic dhcp leasing question. When I connect a computer for the first time to my network. My dhcp server gives me an IP address for a specified time (say 1 day for this example). If I ...
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1answer
24 views

Network bridge loses its IP configuration

After certain uptime of my computer, network bridge adapter (includes WLAN and virtual machine) in my Windows 8 computer suddenly deconfigures from 192.168.1.9 (address made static at router's DHCP ...
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0answers
13 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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0answers
20 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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1answer
36 views

how to set a dhcp clientid via netctl via dhcpcd

I'm trying to set a string as dhcp clientid in a netctl profile. Here is what I tried so far: Interface=eth0 Connection=ethernet IP=dhcp #DHCPClient=(dhcpcd 'clientid="string"') #DHCPClient=(dhcpcd ...
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0answers
40 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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1answer
40 views

Understanding DHCP discovery specific subnet

I am learning networking and in class we are talking about DHCP. I understand that when a host just joins a network it does not have an ip yet so it sends out a dicovery message. we are using ...
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3answers
165 views

DHCP Reservation vs Static IP address

So after browsing some websites, some people are telling me that static IP address is the best. But others say the DHCP Reservation is just as good if not the same. So what is better? Or are they ...
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1answer
75 views

DHCP REQUEST is getting no response

I am new to dhcp world. I have a device with dhcp client which does not acquired ip address some times. When i started analyzing the dhcp frames through Wireshark i get following two types of frames. ...
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0answers
22 views

Troubleshooting DHCP relay

I have a home network with two routers connected through LAN. The main router is connected to the Internet. I've had connection issues with WIFI clients walking through the house as the client ...
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0answers
54 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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2answers
107 views

How to force DNS for specific clients?

I'm running Shibby's Tomato firmware on my ASUS RT-N66U. What I'm trying to do is force OpenDNS IP's for certain clients (i.e. my kids) based on MAC address, while other clients get the router's ...
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1answer
128 views

Arch Linux - DHCP - Can someone diagnose this?

Arch Linux Wifi Connection Issues I am currently in the process of trying to install Arch i686 on an Acer Aspire One 532h (32 bit). At this point I am still in the LiveCD environment and setting up ...
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0answers
25 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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2answers
78 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 ...
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2answers
456 views

How can I override comcast's wonky DNS settings in the router resolv.conf?

Whenever I connect my laptop to my Xfinity router (TC8305C), it writes wonky settings into my resolv.conf. Rather than completely hard-codinging the settings on my laptop, can I override the settings ...
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0answers
36 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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1answer
49 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 ...
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1answer
19 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, ...
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0answers
29 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 ...
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2answers
51 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 ...
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1answer
24 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= ...
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1answer
74 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 ...
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0answers
31 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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2answers
112 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 ...
0
votes
1answer
113 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 ...
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2answers
141 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 ...
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0answers
63 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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0answers
36 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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1answer
35 views

Strange Item on DHCP Client Table

I was recently having internet connection issues and looked on my router's DHCP Client Table. An item that stuck out was the name of my neighbor's WiFi Network. The table listed "Neighbor's WiFi ...
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1answer
91 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 ...
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2answers
160 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 ...