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

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Accesing internet with Host-Only network VirtualBox

I have two VMs in my VirtualBox. Both are FreeBSD and should communicate between each other. I have created network with DHCP enabled and set like this: Server Address 10.10.10.1 Server Mask ...
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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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116 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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1answer
574 views

DHCP server with multiple interfaces on ubuntu, destroys default gateway

I use Ubuntu, and I have many interfaces. eth0, which is my internet connection, and it gets its info from a DHCP-server totally outisde of my control. I then have eth1,eth2,eth3 and eth4 which I ...
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821 views

Two routers in a LAN

router A no wifi +--- pc01 +--- pc02 | +--- router B wifi +--- pc03 +--- printer In my LAN I have a ...
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275 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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1answer
4k views

How to request a specific IP address from DHCP server?

How to request a specific IP address from DHCP server? This question also touches the topic of DHCP address reservation in a router. Background: My home routers DHCP table only allows to create an ...
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95 views

Can I run a mix of static addressing and NAT?

Let's say that an ISP offers a plan with 5 static IP addresses, but I have more than 5 devices, many of which (such as a networked printer, for instance) I do not want or need to have a static IP ...
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460 views

Failed to connect to server: The requested address is a broadcast address, but the appropriate flag was not set

My server IP address starts with 128.xxx.xxx.xxx and my laptop gets its address as a DHCP and is of the for 10.254.xxx.xxx I configured the server to look for my laptop and when I start the server it ...
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Windows Server 2003 DHCP

I have a scenario where user had ip's 192.168.1.100 to 192.168.1.160 previously it was 192.168.1.10 to 192.168.1.254 The problem is that the ip of the users on 192.168.1.19 and 192.168.1.42 is not ...
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Windows 7 machine not pulling DHCP-issued address

Not sure where to go on this one. netsh winsock reset and netsh int ip reset did not help. If I set a static IP on the machine, it communicates fine. But it won't pull a DHCP address. Here's where ...
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How could I fix “No subnet declaration for restart (0.0.0.0)”?

I have a DHCP service installed on my distribution, Backtrack 5 R2 (ubuntu 10.04) and it was working fine, but when I began to configure DNS it suddenly stoped working, how can I make it work again?? ...
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“dhcpd failed” error when starting DHCP server

I am setting up a DHCP server on Debain (virtual machine) on Ubuntu 12.04 host, but unable to get it up and running. My configuration is like this, dhcpd.conf ddns-update-style none; option ...
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How to only obtain information from DHCP server without applying it on Linux [duplicate]

If I do dhclient eth1, it obtains the information (IP address, router, DNS, etc.) and applies it to routing table, /etc/resolv.conf and so on. How to only get and print the information from DHCP ...
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2answers
95 views

Reserve DHCP slots for certian users?

My company has alot of outside suppliers and contractors who need access to our wifi network. Currently, we only allow DHCP to hand out 20 addresses for our quest Wifi network. This typically fill up ...
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2answers
129 views

Enabling access to a home server from “Internet” side

I wish to enable remote access to my linux home server, so I can use it when I'm not home. I tried doing so using port forwarding as follows: http://<RouterInternetIP>:<SomePort> => ...
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2answers
125 views

DHCP: server behavior in a two server situation

This is a question w.r.t server behavior in the DHCP standard. I've read the RFC and it's still not clear to me. Situation is this: There are two DHCP servers on a network. My client initially get ...
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1answer
663 views

How to make WinServer's AD work with Linux DNS/DHCP on VMware?

I got 2 virtual machines : Windows Server 2008 with Active Directory installed. Linux that works as a DNS and DHCP Server I need to make them work together, but I don't if this is going to be ...
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3answers
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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 ...
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5answers
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How to force Windows 7 to ask for a “fresh” IP address from DHCP server?

I'm troubleshooting a certain issue with my DHCP configuration, and need my Windows machine to ask for a "fresh" IP address, so I can see which address DHCP server gives by default. When I do ...
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1answer
363 views

USB Ethernet Adapter Link Local - DHCP Assignment for Link-Local Not Working

I have a rather interesting problem with a Belcarra USBLAN ethernet adapter. According to the manufacturer's tools my host adapter is getting an IP address. According to Windows, however, it is not. ...
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69 views

setting up a WGR614v7 behind a linux box

Here's the setup, I have an openSUSE box with 2 NICs, one goes to my home network router, the other has DHCP running and it attached to a wireless router. I'm trying to get this setup to work before ...
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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 ...
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What to expect in permanent installations of ethernet cable

In my line of work I recently encountered someone who had a DHCP problem, but only with certain hardware and only via certain cables. The cables that we found out caused the problems were in the walls ...
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304 views

IP address changes frequently & Computer is not available via hostname

I have a cable modem from my ISP to which I can only connect wirelessly. Currently I have a desktop PC(windows 7 x64) a dell laptop(windows 7 x64) an iPod(iOS 3.1.3) and a linksys wrt54g router (v8 ...
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No internet connection when connected via wi-fi, but fine via ethernet (DD-WRT)

I just bought a new router and installed DD-WRT on it. When I connect to the router via wi-fi, I cannot get an outside internet connection (and in fact, can not connect to the router admin interface ...
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How to connect wireless router to work network with NAT?

I want to connect a wireless router to my work network, but I want all the wireless clients connected to the router to appear as a single IP address to the "men in black" network admins. So I believe ...
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404 views

Can a broken ethernet cable give link but no ip?

I'm just wondering what the structure is here. Can an ethernet cable give link and seemingly work fine, but cause problems with DHCP traffic between two nodes? One part of me is thinking that link ...
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WiFi cannot connect to internet in two router setup

I am struggling to setup my home network. I have the following setup, also shown in the diagram below (sorry for the MS Word screenshot!): My landlord has an ADSL connection, established by Router ...
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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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2answers
512 views

Laptop kicks other users off the wifi when it connects, then gets disconnected itself

I've got an Acer Aspire One running Linux. When I connect to my building's wifi, everything seems fine for a short period of time (I can google a few things or start downloading an Apt package), but ...
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77 views

DHCP: is DNS configuration optional?

As suggested by title: is there possibility that after a successful DHCP session, DNS server is not configured? Thanks,
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334 views

How to get new IP address on boot up?

In Debian Linux, how can I get a new IP assignment on boot up? I'm working with VMs and I am required that every machine gets a new unique IP after booting up.
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1answer
5k views

PC does not get ip address from router using wired connection

I have an ASUS WL-520GU wireless router with four LAN ports. When my laptop is running Windows 7, and I make a wired connection from the laptop to the router, the laptop does not get an IP address. ...
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4answers
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Obtaining a DHCP IP address if static address is not available

I have seen some questions that are similar to my problem but not a good solution. Ex. User has a laptop and has a static IP address at the office. They also take the laptop off site where they also ...
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982 views

Make dhcp assign same IP and hostname for different interfaces at one machine

I have a feeling that question itself looks stupid but it is not. Please let me clarify. I have dynamic DNS with BIND and NIS configured at my LAN and have laptop which I am using in both wireless ...
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1answer
3k views

Change default DNS server in Arch Linux

I'm in Viet Nam and most social websites (Facebook, Twitter and the likes - even reddit) are blocked by the ISP DNS server. I tried to change the DNS server of my Arch box using the resolv.conf file, ...
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DHCP Client Can't Find DHCP Server

I currently have 3 machines: CentOS (router) eth1 - 18.0.168.1 eth2 - 145.165.34.1 Windows Server 2008 (server) 18.0.168.2 DHCP scope - 145.165.34.10 - 145.165.34.20 Windows 7 (client) Supposed ...
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357 views

Restart Linux without losing IP address

I am using a computer on a network I have no control over (at work) that uses DHCP to assign me an IP Address. Each time I reboot the network assigns me a new IP address (which is annoying as I am ...
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Preventing SSH RSA host key warnings for change of key vs IP address

I have a network with DHCP enabled, and also a computer that dual boots operating systems and has different SSH keys on each (and yes, I would like to keep different keys on each rather than copying ...
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1answer
1k views

Two DHCP interfaces asigned to two default gateways to OS

I have a Ubuntu box that has two networking interfaces (eth0 and wlan0). They are both configured for DHCP in /etc/network/interfaces, but they both assign a default gateway: /etc/network/interfaces ...
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699 views

Testing dhcp server locally on one physical machine with virtual machine

I'm writing simple program to configure and monitor DHCP server on my Ubuntu 12.04. What I'm trying to achieve that my physical machine will be DHCP server and my VM (virtual machine) get one lease ...
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6answers
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A switch and router between the printer and PC that want to print but cannot

IP 192.168.1.5 has a wireless connection to a Linksys router (192.168.1.1) which then is connected to a switch. The switch is connected to a server (192.168.0.2). My printer has IP address of ...
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1answer
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No IP address given to router until after cloning MAC address from another computer

This problem had me occupied most of the day until I finally solved it just a little while ago. Unfortunately I still don't understand why the problem surfaced in the first place or why my final ...
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2answers
307 views

DHCPD (Slackware) - Disabling auto-generation of gateway as DNS server

Good day, I am using a Linux workstation on Slackware 13.37. One "problem" I have had to deal with ever since 11.0 is the following: DNS servers are queried and determined at startup by DHCP ...
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201 views

NAT on MAC-filtered network

My ISP (Hyperion S.A.) provides internet using a UTP cable with MAC filtering. I'm trying to set up a router so that I can connect multiple computers to the network. Most computers would connect ...
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Windoews 7 doesn't Take the right IP configuration when it set to obtain IP automatically

Every time I connect to a network wireless or LAN The laptop does not take the right IP Configuration while the adapters are set to obtain the IP Configuration Automatically, after connecting to the ...
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Access point as DHCP server

My level of knowledge on networking is moderate. I have the following scenario: Our internet connects to the LAN into a normal port (Dlink DS 1008D Switch) Some of the computers in the office ...
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2answers
9k views

Pinging own machine returns an IPv6 address instead of IPv4

When I ping my own machine I get an IPv6 address: Reply from fe80::1004:p8f0:9e40:a42c%10: time<1ms Reply from fe80::1004:p8f0:9e40:a42c%10: time<1ms I used to get the IPv4 address (eg. ...
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435 views

DHCP Not Communicating with Wireless

Hi there I have just setup a DHCP server (experiment) on Windows Server 2008; as I have not done this before I have come across a problem. It will issue out Ethernet IP's however when it comes to ...