DHCP stands for Dynamic Host Configuration Protocol and is an auto configuration protocol used on IP networks and an extension of the Bootstrap Protocol.

learn more… | top users | synonyms

0
votes
2answers
61 views

CentOS 7 is not setting my gateway from DHCP

I have a Minimal Install of CentOS 7. I have disabled the Network Manager as I want to setup my network the "old school" way. systemctl stop NetworkManager systemctl disable NetworkManager ...
-4
votes
2answers
41 views

How to force the network machines to get the ip from a DHCP server? [on hold]

How can I force all the network machines to get the IP from the DHCP server and prevent them from manually editing the network configuration. There are both Linux and Windows machines. The DHCP server ...
-4
votes
0answers
15 views

How to transfer files between computers using Windows 7/8 via Wifi router DHCP enabled [closed]

How to transfer files between computers using Windows 7/8 via Wifi router DHCP enabled. My router is Linksys E900 Cisco. Using it to distribute the cable internet connection stated below. I have a ...
0
votes
0answers
12 views

Change network mask DHCP server

Currently i have a Ubuntu with isc-dhcp-server running with the following configuration authoritative; ddns-update-style interim; ignore client-updates; subnet 192.168.1.0 netmask 255.255.255.0 { ...
-8
votes
0answers
47 views

Windows XP two ip address [closed]

Recently scanned my network and realised that my xp machine has second IP address (same MAC address, same host name on the second IP). The question is why it has second ip address (DHCP) when it has ...
-5
votes
0answers
20 views

Adding a dhcp exclusion range after activating a scope [closed]

If I forgot to add an exclusion range before activating a scope and leases have already been handed out, can I add the exclusion range now without affecting the active leases and will those leases ...
-1
votes
0answers
24 views

OpenVPN and PPTP clients. Get DHCP from server [on hold]

I would like the following: Ubuntu server with PPTP server and OpenVPN server and a DHCP server Ubuntu clients all with the same PPTP username and OpenVPN client certificate. Client connects to the ...
2
votes
2answers
126 views

How to make sure clients use only the IP assigned via DHCP

We want to limit the users Internet usage on a daily traffic basis but not the local network bandwidth. Our users are on different platforms (Windows, Android, IOS), therefore it is not possible to ...
0
votes
1answer
39 views

Computer can't resolve other computer names

I have a network with DHCP/DNS/AD setup with Windows 2012 server. Users cannot resolve computer names on the network without entering their FQDN, i.e. "server", but "server.domain.com" does. The only ...
0
votes
0answers
22 views

OS X bootp acts differently for different clients

I'm working on an OS X NetInstall environment, and having trouble with the BSDP portion. I have some hosts on the same subnet (build) as the server, and other hosts on a different subnet (try). ...
6
votes
1answer
119 views

Is there a downside to always updating DNS from DHCP?

I've got a Windows 2012 Domain Controller running DNS and DHCP servers. The default setting appears to be Dynamically update DNS A and PTR records only if requested by the DHCP clients. (This is ...
0
votes
1answer
52 views

iptables on Linux router does not forward DHCP between two LANs

I have an internal network as follows: A Linux system that serves as router, using iptables, with two network cards A client machine A DHCP Server The Router's eth1 is on the same LAN as the ...
-1
votes
1answer
32 views

Possible to auto assign static IP after first DHCP? [closed]

I'm building networks with 256 devices that can't be pre configured (they all must start from the same configuration, it's not possible to give them static ip beforehand). Is there anyway from a ...
0
votes
1answer
39 views

Network Route Test for DHCP

Is it possible to get a remote client to send a DHCP-style request to a server (which you're on) to test the network routes are open? I can check from server to client, but different ports are used on ...
-1
votes
0answers
14 views

DHCP router and static address to one client

Odd situation here that I have not handled before. I have a DHCP router that gets an external address of 10.x.y.z (IP address space 1). I have four clients to this router (which issues class C ...
-1
votes
1answer
65 views

Network Clients receiving DHCP responses from wrong subnet

This is my first time posting and I have searched for similar question to the best of my abilities yet believe none to be helpful for my cause. My problem is, that I have a Fritz.Box 3270 as router, ...
0
votes
2answers
80 views

Using Router with DHCP and NAT and Windows Server 2012 as DNS

I have a network currently set up as per the image below. We use Regus's shared Internet and I've create a sub network for our office by using DHCP and NAT on the airport extreme router. Now the ...
0
votes
0answers
51 views

Sonicwall L2TP Server is using a “phantom” internal DHCP server

Following a few articles on options 121 and 249, I'd like to push out routes to the L2TP VPN clients using the internal DHCP server on the Sonicwall. However, the Sonicwall seems to be using a ...
0
votes
1answer
34 views

Data only seems to go one way on ethernet over usb connection [closed]

I have a router+modem combo connected via ethernet to a raspberry pi (this part works fine) The pi has a usb wifi device plugged in, and runs hostapd, does NAT and provides internet to a household. ...
0
votes
0answers
7 views

Special type of DMZ? [migrated]

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 ...
5
votes
2answers
262 views

How to correctly configure DNS usage in Ubuntu? Authoritative answers without RA flag are ignored

I have latest clean Ubuntu 14.04.1 64-bit from official website installed in Virtualbox. I connect to a VPN network using vpnc that sets 2 DNS servers using DHCP: user@virtual:~$ cat /etc/resolv.conf ...
0
votes
0answers
24 views

How to identify hosts with bridged adapters

We have an issue with our Windows DHCP server randomly having bad address errors. The current top theory is that there is a host within that pool with bridged network adapters, causing all sorts of ...
13
votes
2answers
2k views

What are the possible issues in using very short DHCP lease time (< 1min)?

We have a network setup for a demo, which lasts about 15mn. Our DHCP server is configured to assign ~ 100 addresses (max number of simultaneous connections or our AP) ... but since people might come ...
-1
votes
2answers
68 views

Windows domain + Linux Domain on One Network

Currently our network is all tied to Active Directory with both Windows and Linux workstations/servers. We would like to implement a Free IPA server that synchronizes authentication between a Linux ...
4
votes
2answers
162 views

How can i locate rogue DHCP servers? [duplicate]

I am investigating some odd behaviour on a sub-net, where host registration doesn’t list some of the IPs that some users report having. Now that I’ve seen evince, i want to passively scan for the ...
-4
votes
2answers
76 views

How can NIC's remember the DHCP address past power off? [closed]

I have now seen an HP ProLiant DL385 G7 (573088-421) and HP ProLiant DL360p Gen8 both being able to remember the DHCP address for its NIC's even though I had powered off the server, and pulled the ...
1
vote
0answers
41 views

Access Denied DHCP Tool

I cannot figure out why this is happening, when opening the DHCP tool on my server, I get the following message. Access Is Denied You do not have access to this DHCP server. To view information ...
0
votes
1answer
60 views

Foreman errors out when provisioning using an ms-dhcp/dns smart proxy

Im running foreman, with smart-proxy on a win2k12 r2 box running ad/dhcp/dns. When i try to provision smart proxy dumps this to the logs: Changed the current scope context to 192.168.20.0 scope. ...
0
votes
1answer
328 views

KVM/libvirt: How to configure static guest IP addresses on the virtualisation host

What I'd like to do is to set the guests' network configuration (IP address, subnet, gateway, broadcast address) from the host system. The used network setup is in bridge mode. How can I configure the ...
0
votes
0answers
78 views

DHCP Name Protection and Dynamic DNS

Will DHCP Name Protection prevent a dynamic DNS update every time the FQDN is found to already be present in the DNS zone? Example: Windows Server DHCP/DNS Two dhcp scopes: Wired vlan 10 scope ...
0
votes
1answer
114 views

Can't Access Network Drives through VPN

My issue is that when I'm outside the office I can't access any of my network drives. I can't UNC to them, through the FQDN or IP address. For example, domain.local\folder, or 172.26.6.2\d$. ...
0
votes
0answers
14 views

What is the default behavior when a RHEL 6.x DHCP client fails to renew its address?

I have had experience with some RHEL 6 servers that were found unreachable, and investigation of the console revealed that they had failed to renew their IP address, and eth0 was without an IP. There ...
0
votes
1answer
85 views

CentOS: DHCP Server and DHCP relay on same machine

eth0 IP: 192.168.1.100 Alias interface eth0:dhcp IP: 10.10.1.100 dhcpd.conf: authoritative; local-address 10.10.1.100; subnet 10.10.1.0 netmask 255.255.255.0 { range 10.10.1.10 10.10.1.50; ...
1
vote
1answer
67 views

DHCP Option 66 ignored?

Im trying to setup a PXE boot server to deploy CloneZilla images easily, using pxelinux.0. I have a tftp-hpa server running on a server, I tested it with a client and it works fine. We are using a ...
0
votes
3answers
66 views

Split a Scope Linux<=>Windows

Is it possible to create a DHCP Failover Cluster between a Linux(Ubuntu) based server and a Windows Server 2012R2 based server. My idea was to include a new data into the dhcp.conf data to exclude a ...
1
vote
1answer
131 views

isc-dhcp leases file never cleaned

When running isc-dhcp the leases file seems to grow indefinitely (several hundred MB). If I restart the isc-dhcp service, the file shrinks to 1.5MB. How can I have isc-dhcp flush expired records ...
1
vote
0answers
134 views

Force Windows DHCP to Update DNS for All Current Leases

Is there are way to force Windows 2008R2 DHCP Server to update all DNS entries for all current leases? (Guess the server-side equivalent of ipconfig /registerdns) We had a configuration issue with ...
0
votes
1answer
36 views

Subnetting new address cannot connect to internet

I re subnetted our network from 10.1.24.1-254 subnet 255.255.255.0 To 10.1.24.1-10.1.25.254 subnet 255.255.254.0 I've changed all the devices subnets. The computers come online and get dhcp. They ...
0
votes
0answers
36 views

DNS options on Cisco switch providing DHCP

At the company work for we decided to move DHCP duties from a Windows server to our 3750-X switch stack that's the gateway for our network. I researched the commands needed and cobbled together the ...
0
votes
1answer
22 views

Windows Network Sharing - DHCP and Gateway pass through

I have several Windows 8 machines that are setup to do connection sharing over a wifi connection with switches behind a gigabit NIC. The devices behind the machines are Cisco phones and they are ...
2
votes
1answer
45 views

Preventing IP Phones from eating up DHCP addresses

We just installed a new IP phone system. The phones get their configuration via DHCP, which includes an option to set the phone to a different VLAN. The phone then requests an address via DHCP on that ...
0
votes
2answers
73 views

DHCP server - No IP for computers out of the domain

I would like to know if there is a way to deny leasing an IP address through my MS DHCP server to computers which are not registered in my domain. Thanks!
0
votes
2answers
504 views

Cannot ping a VM from a Hyper-V host

I am facing a weird situation in my network environment. My infrastructure looks like this: I have a D-LINK DIR-635 acting as my default gateway (192.168.0.1) A physical Windows 2012 Server ...
0
votes
1answer
45 views

Linux static dhcp ip for visitor access internet without requesting MAC address? [closed]

Currently, my company internet access for visitor are required to request MAC address from them if they want to access to internet. Can we do something like the Hotel wifi? they just access to the ...
0
votes
0answers
18 views

Draytek AP Wireless Bridge IP Issues For LAN Devices

OK, I have a very messy network at my office, piggybacking off a neighbor's WIFI for internet (with their permission). I have a Netgear Router + DNS (DGN2200) connecting via LAN to a Draytek 800AP. ...
0
votes
1answer
45 views

Failover DHCP Windows 2012

Is Windows 2012 failover DHCP (hot standby) compatible with Windows 2003? I'm not sure if it's enough to create a Windows 2012 DHCP server and configure failover options.
1
vote
1answer
31 views

Configure DHCP role on windows server without starting it

we want to migrate our dhcp service from a linux server to a windows 2008 r2 server. We have a huge list of mac-ip static leases. Is it possible to install a dhcp role on the windows server and ...
2
votes
1answer
45 views

Two LAN cables when using Remote Access Card?

I recently bought a HP MicroServer N54L and a HP Remote Access Card. Connecting to the server over a KVM viewer for BIOS setup etc. works fine, but when it comes to installing Ubuntu 14.04. the ...
0
votes
0answers
26 views

How to fix stalled connection on large download

I have a cisco 1921 router performing routing and NAT function. Cisco 3750 is performing layer 3 core switching duties. Users are complaining about large file transfers being stalled (not dropped) ...
0
votes
4answers
185 views

Who has the highest priority DHCP or static IP?

I have a printer at work, for some reason the router refuses to assign a specific IP for that printer via DHCP reservation and I had to configure it with a static IP. Sometimes the printer is off. I ...