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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117 views

How to automate running the dhclient for wwan0?

in Linux Mint 17 I have to run sudo dhclient every time I connect and disconnect to/from the Internet using a mobile broadband dongle, because otherwise the connection is declared active but when I ...
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84 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 ...
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255 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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233 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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659 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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73 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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3k 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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53 views

IPv6: Cannot reach outside of LAN (OpenWrt Router connected to ISP Router through Wi-Fi)

Hello dear server expert, I would like to ask for you help for my installation. I have a Freebox Revolution (I am French and my ISP is Free). The box provides IPv4 and IPv6. Every computer connected ...
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17 views

Can I seed what DHCP options are offered on my network connection WITHOUT server access

When you get a DHCP address from a DHCP server it comes with options. I want to see all of the options set. Yes, I know that I could bug one of our extremely busy sysadmins and get them listed off to ...
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17 views

Linux IP aliasing with single DHCP and single STATIC IP address

I'm working on an embedded system with a single physical ethernet device. Using aliasing, I'd like the device configured such that one static IP address (call it s.s.s.s) is ALWAYS available. The ...
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33 views

DHCP server in separate broadcast domain and option 82

Recently studies of DHCP servers raise some questions, which I cannot find the answers to using Google. Many documentations state: "If there is only one subnet declaration, and no network interfaces ...
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57 views

2 Routers on network, can i have them do different DHCP

I'm trying to fix a network that we want to have private and public access. Currently they have Verizon service with the actiontec wireless modem/router as the main router. They have the office ...
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32 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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33 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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25 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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124 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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144 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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69 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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51 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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96 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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384 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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1k 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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282 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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181 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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205 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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64 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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441 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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151 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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199 views

Does Windows internet connection sharing support DHCP reservation?

I have a rack full of computers connected to the internet via internet connection sharing (ICS) on one of the Windows 7 machines. Two Axis IP cameras are connected to the rack. Each time the system ...
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45 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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95 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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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': ...
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136 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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429 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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2k 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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461 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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589 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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307 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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9 views

Connected to OpenVPN server (through WiFi), changing DNS on unprotected adapter stops Internet entirely

So whenever I connect to an OpenVPN with a configuration file I notice two things: The TAP- adapter has no gateway of it's own. Is that normal? Trying to resolve this problem: I copied all the ...
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9 views

Static LAN IP address not being saved. Always reverts to DHCP

I am running Windows 8.1 (64 bit) and going to my local network connections, right clicking and then going to properties of my Broadcom wireless connection I change from DHCP to static ip (IPv4) by ...
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13 views

How to locate and add hostnames on LAN managed by DNSMasq on DD-WRT

I am running DNSMasq as both my DHCP and DNS server on my DD-WRT router. I had thought that DNSMasq was adding hosts that it registered in DHCP to the DNS server automatically, but I have a few ...
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26 views

Windows 10 preview PC getting served static and DHCP address

Setup PC: Latest Windows Tech Preview IP address set to static. Router: R7000/DDWRT Lately I've notice, when checking devices that are connected to my router, that this PC has been showing the ...
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59 views

How to bridge two interfaces both on different networks with different IP addresses in OpenWRT?

My embedded Linux device—running OpenWRT—has two interfaces that are ath0 and ath1. ath0 is a WLAN port also runs a DHCP server. ath1 is used for Internet connection. Now, I have to setup these ...
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23 views

two different name servers for home network and vpn network

As a disclaimer: I am new to linux. I have the following setup: At home I have a router (AVM fritz box) that serves as a dhcp server and "dns" server for my local network. I don't know if it is a ...
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42 views

How to force “DHCP Discover” on Windows 7

I found that at certain network, Ubuntu, installed in my laptop, could not get DHCP address, whereas Windows 7 can get DHCP address. Thus, I tried to dump packets related to DHCP address acqusition ...
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41 views

Trouble with Static Leases on DD-wrt router

I'm having real issues trying to set up a new DD-WRT router. It is a netgear R7000 with build DD-WRT:- v24-sp2 (12/15/14) std - build build r25344 My set up is basically:- BT Home Hub 4 (Using just ...