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
0answers
50 views

TFTP open timeout with ip helper

I'm setting up a DHCP / TFTP server for server provisioning via PXE. I have two hosts on the same segment (10.1.1.0). One hosts boots, gets its IP, and is able to pull the pxelinux.0 image over TFTP....
0
votes
0answers
48 views

DHCP not working for new pool

I created new dhcp pool(41 pool) in Windows server 2012 called vlan 41,routed with default gateway in router, added interface vlan 41 on core switch 3650, given ip help address as server address. I ...
0
votes
0answers
133 views

Force isc-dhcpd to disregard client hostname in ddns updates

I have the following configuration of isc-dhcpd-4.3.1: ignore client-updates; ddns-update-style interim; subnet 192.168.128.0 netmask 255.255.255.0 { use-host-decl-names on; update-static-...
0
votes
0answers
17 views

How to allow DHCP between 2 networks using Shorewall?

I have a server with hyper-v and 3 networks: eth0 is virtual, eth1 is physical, eth2 is extranet from ISP. Virtual network has a DHCP running and all virtual machines can reach it fine. But not the ...
0
votes
0answers
51 views

Configuring ISC DHCP server to not serve IP's on the local network

Is it possible to have a DHCP server serve subnets for multiple network segments, but not its own local subnet? I have a DHCP server on a subnet 10.x.x.x. It serves approximately 125 subnets on ...
0
votes
0answers
55 views

dhcpd.conf — one-lease-per-client statement having no effect

I have read on this and this man page that the one-lease-per-client true statement in my dhcpd.conf will stop duplicate leases to a single client. However, I am still able to sustain multiple leases ...
0
votes
0answers
30 views

CoreOS docker.service containers can't resolve domains

I have servers PXE booting to CoreOS with persistent state being written to disk. When I start docker containers on the host they work fine. And I have the docker.service set in the cloud-config to ...
0
votes
0answers
84 views

Server 2012: How could I create a DHCP scope just for my RRAS PPTP VPN clients?

I am using Windows Server 2012, and the server in question is both the PPTP server and the primary DHCP server. My current setup has a DHCP scope for this location, and anyone remoting in is assigned ...
0
votes
0answers
139 views

Why do our Windows 2012 R2 DHCP Servers lose reservations?

Windows takes our DHCP reservations, but does not know how to hold-on to the reservations. There is a history of this in Windows 2008 DHCP server, but the closest i could find for Windows 2012 R2 ...
0
votes
0answers
24 views

Ubiquity AP keeps people from connecting sometimes. Happens with a couple other AP's as well

I believe this is ok for server fault, forgive me if not. We have had numerous very cheap AP's and I am trying to purchase a mid tier product now. We had EnGenius ENS 202EXT and a couple home office ...
0
votes
0answers
23 views

Could dhclient be causing haproxy to stop listening?

I've noticed every 7 days HAProxy stops responding to requests correctly - it automatically makes firefox download a blank file in place of the website. Upon inspecting the server - everything seems ...
0
votes
0answers
30 views

Wireless clients loosing network access randomly

We have the following setup at the office: Windows Server 2012 DHCP Unifi AP (one of these rounded beauties) set up to use WPA2 with AES Zyxel ZyWALL 110 as firewall Some of the clients (laptops) ...
0
votes
0answers
93 views

Using dhclient or dhcpcd to assign address for alias interface

I have a Linux machine with one Ethernet interface eth0 which already has one primary static address and one secondary static address (eth0:1) assigned. I would like to use DHCP to dynamically assign ...
0
votes
0answers
72 views

ISC DHCPv6 reservation

I've set up ISC DHCPv6 server on a CentOS 7. Here is the /etc/dhcp/dhcpd6.conf: authoritative; option dhcp6.domain-search "example.com"; default-lease-time 3600; max-lease-time 7200; log-facility ...
0
votes
0answers
30 views

DHCP based Server not updating A record

We have Citrix Servers which get IP from DHCP. After scheduled reboots, some Citrix servers are not pingable via hostname. nslookup is not able to resolve the hostname. OS: Windows 2008 R2 Citrix ...
0
votes
0answers
33 views

How to reach a private IP (DHCP enabled) from a public facing IP through NAT?

Lets say we have computers C1 and C2 C2 has two network interfaces C2.eth0(public facing) and C2.eth1 local second physical network (addr:10.10.70.101 and Nw:10.10.70.0) Now, there are multiple ...
0
votes
0answers
102 views

Windows 7 can't join in Linux domain

I installed a Windows 7 in VirtualBox and a CentOS 7 x64 too. My DHCP config is : subnet 192.168.72.0 netmask 255.255.255.0 { option routers 192.168.72.1; option subnet-mask 255.255.255.0; option ...
0
votes
0answers
377 views

no default gateway on interface that is set up with DHCP on CentOS7

I am using CentOS7 with multiple interfaces (ens161, ens192, ens224, ens256). The box has all static IP's with the exception of one interface that is set up to DHCP (ens192). ens192 is set up as ...
0
votes
0answers
32 views

“Add Server” in MMC not showing fqdn. Any ideas?

and Nothing is "broken" but my curiosity (and sadly O.C.D) has my wondering why when I add another server through MMC it doesn't show the fqdn of the "added" server, just the hostname. Tutorials ...
0
votes
0answers
472 views

dhclient: No broadcast interfaces found, but eth0 is up and broadcast

I'm experiencing a common problem with dhclient. But I wasn't able to find a clear solution to this problem. System: ReadyNas RN104 Stock Debian for armhf Just upgraded to Debian Jessie (now ...
0
votes
0answers
105 views

Ubuntu MAAS: PXE only booting two nodes at a time

I'm currently setting up an Ubuntu (15.04) MAAS (1.7) cluster for the first time. It seemed quite straight forward and I even figured out how to boot VMs running on vSphere, so I have a nice testing ...
0
votes
0answers
1k views

What happens when “Auto state switchover interval” is less than “Maximum client lead time” in DHCP?

I was wondering what happens when "Auto state switchover interval" is less than "Maximum client lead time" in DHCP? The question was raised after reading definitions of MCLT & ASSI: Maximum ...
0
votes
0answers
90 views

Why Windows not get DHCP properly?

I have a VM that installs Windows Server 2008 R2 Enterprise. It configures both DHCPv4 and DHCPv6 clients. The VM locates on an isolated network, where a dnsmasq offers both DHCPv4 and DHCPv6 servers....
0
votes
0answers
88 views

Setup server hosting hyper-v as a router

I have a windows 2012 server hosting several windows VMs by hyper-V. As I was building this infrastructure at home all VMs got IPs assigned from my home router (DHCP). So both hyper-v manager and VMs ...
0
votes
0answers
316 views

DHCP binding on Windows Server 2012 R2 won't stay checked

I've got a DHCP role running on a Windows Server 2012 R2 machine. The scope is set in the proper IPv4 subnet. When I select "Add/Remove Bindings..." I see both the NIC with the configured static IP ...
0
votes
0answers
124 views

DHCP reservation for Forefront TMG VPN clients

We have a remote computer connect to our cloud VPN network. VPN server is Forefront TMG. FF TMG is configured to server IP addresses based on the netowork's DHCP server. In DHCP I see leases to VPN ...
0
votes
0answers
99 views

Under CentOS6.5, DNS Server build with DHCP, Client can't ping domain-name, but IP can

I'm trying to build a DHCP and DNS server. I check that client ip is ok to capture (11.11.0.1), ping server ip (11.11.0.9) is ok, but ping domain name (example.com) is not ok. On the server, ping ...
0
votes
0answers
231 views

How to configure DHCPv6 and DNSv6 configuration in Ubuntu 12.04?

I'm planning to configure DHCPv6 and DNS server in my network. I would like to understand whether both DHCPv4 and DHCPv6 can be configured using isc-dhcp-server service? When i tried nslookup ...
0
votes
0answers
41 views

DHCP export using netsh

I'm trying to export a DHCP database using the following command: netsh dhcp server export c:\dhcpdb.dat all However it completes with the error WARNING: Could not obtain host information from ...
0
votes
0answers
32 views

Unique record per ip address on Windows DNS

I have a little problem with my DNS server under Windows domain. My DNS server gets automatic registration from clients by dhcp. Please consider this situation: Computer PC01 with dhcp address ...
0
votes
0answers
64 views

How can I assign an IP by UID in DHCPd

Here was answered how to assign an IP by MAC address. I want DHCPd server to assign IP by UID. Can i just add record to dhcpd.conf in the same manner? For example: host example { uid 00:...
0
votes
0answers
48 views

DHCP from Cisco 1921 failing after switch nr 2

I have a network which uses a Cisco 1921 router. The router is connected to a Dell Powerconnect 2848 switch and from that switch is a connection to a small SOHO Planet switch which 3 computers connect ...
0
votes
0answers
79 views

Windows Server 2008 reboots when DHCP server is down

I have two Windows Server 2008 servers. Both of them have static ips, both of them are domain controllers. The first one run a server based software, the second one is our dhcp server. Some times the ...
0
votes
0answers
129 views

Windows DHCP client only using one DNS server?

I have a PC running Windows 7 professional. It is a DHCP client. The DHCP server is sending it two DNS servers. This has been verified with packet captures. However, after running ipconfig /release ...
0
votes
0answers
48 views

Small Office WiFi config for iPhones

I purchased an ASUS RT-AC66u wireless router for use in a small office. I have the router configured as an access point, DHCP is turned off. It is using a static IP of 10.10.10.251. My DHCP server ...
0
votes
0answers
218 views

Internet drops out randomly for short periods of time (LAN issue)

I run a network (I'm just a math teacher) at my school. We get random 10 or so minute periods (I'd guess three a day on average) where the Internet is not accessible from within the LAN. If I go to ...
0
votes
0answers
854 views

OpenVPN Linux Client does not bring up tap0 interface

I have an OpenVPN client on Linux connecting to an OpenVPN server. The server assigns IPs via DHCP, thus I connect using the tap interface rather than the tun interface. OpenVPN connects, ...
0
votes
0answers
246 views

Clients do not see DHCP Server… what am I missing?

Old router died and just got the new one in and I can't figure out what I'm missing to forward dhcp and dns to windows server 2012. Old router was a netgear R6300, new one is an N900. Before the ...
0
votes
0answers
142 views

Edge firewall on Ubuntu, dynamic IP address, static DNS

We're setting up a software firewall, and one of the issues we're facing is that eth0 has a dynamic IP address. In /etc/network/interfaces we've got the following: # The loopback network interface ...
0
votes
0answers
805 views

CentOS DHCP server not updating DNS nameserver on Ubuntu Client

I have a working DHCP server on CentOS, with /etc/dhcp/dhcpd.conf set up as follows: subnet 192.168.1.0 netmask 255.255.255.0 { option routers 192.168.1.1; option subnet-mask 255.255.255.0; ...
0
votes
0answers
73 views

DHCP Randomly Not Assigning Addresses

Having a strange issue for the past day or so. Some users (probably about a dozen, dozen and a half out of 100 or so) are having trouble pulling DHCP. They are getting the private IP address. If I ...
0
votes
0answers
163 views

How do I stop a Linux computer from sending a DHCP hostname?

I need to set up a Linux computer so that it uses DHCP but doesn't send any hostname at all. I'm using isc-dhclient-4.2.4 /etc/dhcp/dhclient.conf contains the line send host-name = gethostname(); ...
0
votes
0answers
88 views

DHCP server with ability to update mac address dynamically

Is there a better way to maintain MAC to IP specification in dhcp with out restarting dhcp service each time when there is an update. is it possible to use DHCP with database in Linux to save all ...
0
votes
0answers
2k views

CentOS 6.4 - Cant get an IP from DHCP

I have a Ubuntu and CentOS system running on XenServer. The Ubuntu Box gets and IP from DHCP no problem. The CentOS will not take a DHCP but a static address works fine. [root@XenCentOS ~]# service ...
0
votes
0answers
173 views

How does DNS update work in an environment where DHCP performs registration, and clients may have multiple DHCP leases?

Here are the particulars (all Windows): DNS - Our DNS only stores one A-Record per hostname. Scavenging is not currently enabled. DHCP - DHCP is configured (server level) to perform DNS registration ...
0
votes
0answers
278 views

Configuring HP Proliant iLO using hponcfg

I am configuring an iLO using hponcfg by logging into the machine remotely and running hponcfg with scripts Mod_Directory.xml and then with Mod_Network.xml. I am enabling the DHCP on the device. But ...
0
votes
0answers
620 views

name not resolve in vmware client PC

I have configured DNS server and DHCP sever on centos 6.2 vmware virtual machine. I have a windows xp vmware client machine. nslookup command is work in server terminal But it won't work in windows ...
0
votes
0answers
672 views

Create a DHCP working lab in HyperV (2012) all Internal

I need to create a lab for testing purposes. I got a good desktop on which i have installed a server 2012. In HypverV, i have installed two 2012, one XP and one W8. The idea is that the one and ...
0
votes
0answers
2k views

Windows DHCP client and DNS suffix search list (option 119)

I'm trying to supply the dns search list to my windows clients to make the internal DNS naming scheme usable. Windows AD is not used so no GPO available. The ideal way would be to supply the dns ...
-1
votes
0answers
14 views

Windows Server DHCP not working over 2.4 GHz Network

I have just realized that my Windows Server that is handing out DHCP addresses is not working over my 2.4 GHz network. I have tested both the Wired and 5 GHz networks in our building, but over the 2.4 ...