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

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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 ...
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178 views

Detect network clients connect and disconnect

I have a linux gateway/server, which sharing PPPoE internet connection between network users. Seeking for a proper way to detect when network clients are connected to and disconnected from the ...
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199 views

Using BT Business Hub 3 with separate DNS server

We have a BT Business Hub 3 in our office to connect to the internet. We are a web development company and we have internal servers in our office that we want to be able to access from mobile phones ...
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567 views

WRT54G router with tomato firmware doesn't connect to internet if Windows 8 PC is suspended

This problem began occurring within the past couple of days, and to my knowledge I made no changes to any hardware or to my network layout. I have a Windows 8 PC connected to a gigabit switch (D-Link ...
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67 views

Telephone Server, Telephones, Printers, PCs & Servers on Individual VLAN's, DHCP clashing

Stuck at work tonight with a big issue. As a requirement for being taken over by a corporation we have been asked to stop using a firewall (juniper ssg-140) to separate our telephone system from the ...
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48 views

Correct usage of Windows Server on network?

I have two routers, one with dhcp turned on and the other with it off. this is a functioning home network. Now, I am trying to integrate into it a windows server. Should the windows server be doing ...
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2k views

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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1k views

How do I configure Windows 7 to get its timezone from DHCP?

The DHCP protocol supports setting the time zone and the Windows DHCP Server implements this feature. The time zone on my company laptop (a member of a Windows domain) never changes when I connect to ...
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16 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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21 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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55 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 ...
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32 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 & ...
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33 views

dhcp no lease because of not-DAD mode

My virtual machine does not receive an IP lease anymore. Manually requesting a new ip lease by 'ifdown/ifup eth0' or 'dhclient eth0' or 'service network restart' don't work either. The error is ...
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70 views

why the ping doesn't get a reply?

I have an embedded board that has the CFE, a minimal loader. I have a host machine - linux FC16, where I am running a dhcpd server. My interface is p3p1. Here are the details of the ifcfg-p3p1. ...
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310 views

Using DHCP to get multiple IP addresses on single NIC on RedHat

I am trying to obtain multiple IP addresses using the ISC dhclient supplied with Red Hat Enterprise Linux 5 in order to provide the IPs to multiple applications, which will run on separate virtual ...
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646 views

Why won't my DHCP addresses “stick”?

I've been having some addressing issues that I've been unable to solve, and I'm hoping I can get some guidance about other things to research. Service provider is Time Warner cable. A static IP is ...
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212 views

How to set up a VM gateway/DHCP and virtual network in CentOS KVM?

Today I have a working setup where the physical host runs W2k3. It has 2 physical NIC's. It runs Vmware server and I have a ClearOS VM installed acting as a FW/DHCP/DNS for both the host and all the ...
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170 views

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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166 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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59 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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298 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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122 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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44 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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90 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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1k 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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122 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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320 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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1k views

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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1k 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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426 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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532 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 ...
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296 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

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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28 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

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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24 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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27 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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13 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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51 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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26 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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28 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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10 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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53 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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29 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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32 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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19 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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38 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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20 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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59 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: ...