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

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ISC DHCP Server scope error

Why am I getting the following error after modifying my dhcpd server config? option space definitions may not be scoped
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2k views

Windows Server DNS with non-Windows (Linux, Mac) Computers [duplicate]

How do I get my non-Windows (Linux, Mac) computers to properly register their IP address into my DNS server? Server Name: AD1 OS: Windows Server 2008 R2 Roles: DNS, AD, DHCP DNS SETTINGS Dynamic ...
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DHCP Server Not Offering to PXE Client

DHCP Server Not Offering to PXE Client BACKGROUND: I'm in the process of adding PXE services to an existing SCCM 2007 server. The SCCM server is separate from the DHCP server (Server 2008 x86) and ...
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1answer
135 views

Best Practices Analyzer on Windows 8.1 erroneously complaining about DHCP Default Gateway

I'm using Server Manager on Win 8.1 Update and have DHCP installed and running on a Server Core 2012 R2 domain controller. The BPA believes Option 3 (Default Gateway/Router) is not set. But it ...
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1answer
22 views

2008 DC DHCP Inquiry

We have a few servers mainly for SVN, File and nightly builds. We only use the DC for ALC. Currently, I'm using the Sonicwall's Built in DHCP to issue IP's to developers. Of course if the firewall ...
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1answer
581 views

Windows 2012 DHCP Failover: Scope refuses failover config Error: 20044

I have a scope configured on a Windows 2012 DHCP server (primary in a hot standby config) with two Cisco Vendor class options. I've added the Vendor class options, identically, to the standby server. ...
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1answer
1k views

Retrieving kickstart and other .img file in pxe remote installation in CentOS

I am trying to installation CentOS through pxe tftp installation. Installation starts but it fails to download image files from the http server. but file are accessible on the http server. Logs from ...
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14 views

IBMi DHCP Dynamic DNS not communicating to DNS Server

I have a single IBMi server set up with a DHCP and DNS server running on it. I have set up the DNS forward and reverse zones for the local network to allow for dynamic updates, and I have set the ...
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2answers
64 views

IP auto changed on Win2k8 VM

I'm having a problem with my Win2k8 virtual machine. After the virtual machine boot, it gets an IP address from DHCP. But later on, NTP makes a big time shift, so Windows automatically renew (in fact ...
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2answers
833 views

Windows 2012 DHCP server with 2 NICs

I have a Windows 2012 Server with 2 NICs running as a DHCP server. Each NIC is connected to a different subnet. I'd like to run DHCP service on each subnet from the same server. Is that possible? ...
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1answer
180 views

how can I block internet access for non-domain computer windows server 2012 [closed]

Is there any GPOs that allow me to block an non-domain computers ? I tried to use IPAM for blocking an ip address but it does not work! What should i use ?
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1answer
837 views

Incorrect lease times from Windows 2012 R2 DHCP

Env: Two Windows 2012 R2 DHCP servers in active/passive (hot standby) mode serving one scope. Scope lease duration: 1 day. MCLT: 1 hour. Situation: New dhcp client gets IP configuration with a ...
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0answers
62 views

DNS Registration Using Non Windows DHCP

We are searching for a solution for our VPN users. We use a Fortinet SSLVPN. The Fortinet appliance issues DHCP to our clients. It is configured to have the clients use our internal Windows DNS ...
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1answer
255 views

Motorola SB6141 assigns 192.168.100.0/24 IP via DHCP when cable dies; can I prohibit systemd-networkd from using 192.168.100.0/24 addresses?

I have a Motorola SB6141 cable modem connected to a Linux firewall that obtains an IP via systemd-networkd's DHCP function. Every so often, the ISP will have issues, and for some reason, ...
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1answer
187 views

ISC DHCP - different subnet for specific mac addresses

I'm attempting to create a different subnet for a few specific mac addresses, and have my DHCP config set up as follows: authoritative; shared-network local { subnet 192.168.2.0 netmask ...
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3answers
316 views

DHCP Relay vs Multi-Homed DHCP Server

I'm sketching out a new network topology and I'm unsure of how to solve the issue of DHCP between two VLANs. 10.50.2.0/23 will hold the majority of our users, corporate wifi, printers etc. ...
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1answer
72 views

How to show other columns in Windows DHCP server?

In the Windows Server DHCP server, the only column that shows for "Reservations" is the "Reservations" column. That's not very helpful. It would be so much more helpful if I could see the ...
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1answer
373 views

Have DHCP use different scopes based on MAC address using Server 2012

I'd like my Windows 2012 DHCP server to give ShoreTel phones IP addresses from one scope, and everything else IP addresses from another scope. For example, I'd like to give phones IPs from ...
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1answer
466 views

DHCP troubleshooting - client timeouts

I have setup two ubuntu 13.10 serwers - one of them is in a small test network + two more clients, separated from our company's main network but connected to the Internet. This server is my testbox, ...
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1answer
304 views

Is there a limit to the number of DHCP scopes I can have?

Some context: Currently all devices in our remote sites are setup on 1 VLAN. We have 400 remote sites. A project wants to split our sites into multiple VLAN's which on the whole seems like a good ...
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1answer
39 views

DHCP frames (DISCOVER/REQUEST frames) have AutoIp address as source IPv4 address in Ipv4 header

In my TcpIp stack, I want to trigger AutoIp/LinkLocal and DHCP addresss assignemtn parellelly. But the response from the DHCP server is too slow. By the time I get a reponse from DHCP server the ...
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98 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 ...
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90 views

Server 2012 DHCP Policy for Polycom MAC addresses

I am setting up a Server 2012 DHCP Server and I want to apply a Policy to assign our Polycom phone within a specific IP range. I have created a policy using MAC address equals 0004f2, which is the ...
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1answer
413 views

Windows Server 2008 DHCP: Lease offered, but not accepted

My Windows Server 2008 should be configured to work as a DHCP Server in the Network. Therefore I setup the Role and configured everything. I have downloaded a tiny tool, that can show DHCP-Offers on ...
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1answer
368 views

DHCP Warning Sign Icon On Windows Server

I have a Windows Server 2008 R2 SP1 Domain Controller. I have the roles AD, DHCP, and DNS installed on this server. I noticed today that there was a warning sign on my IPv4 setting, but not on my IPv6 ...
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37 views

Windows Dynamic DNS Update Sequence

I'm trying to get the Windows DDNS update sequence straight in my head. Here's what I think happens: Windows Client == DHCP Discover Windows DHCP Server == DHCP Offer Windows ...
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1answer
73 views

DHCP Reservation being ignored in Windows 2008 R2

I have multiple scopes on my dhcp server. 192.168.10.x and 192.168.20.x I have reservations for certain mac addresses on the 192.168.10.x network. However occasionally they will pull 192.168.20.x ...
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1answer
548 views

How do I configure an ASA 5505 to pull a DHCP address from a bridged DSL modem/router?

I have a remote office that I am hooking up to our corporate network and this particular site has a centurylink adsl2+ router that I need to negotiate an rfc 1483 via DHCP connection across. The dsl ...
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2answers
893 views

Can you use WMI to determine if a connection gets its DNS servers from DHCP?

The DNS server search order for a network interface can be read from Win32_NetworkAdapterConfiguration like this in Powershell, or programmatically using .Net ManagementObjects: > $NICs = ...
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2answers
982 views

Can a Windows DHCP server serve a scope that it is not a part of?

The situation I have a windows SBS 2008 box running as DC/DNS/DHCP/Exchange/File Server to a network on 192.168.1.0/24. Suffice it to say that the IP of the SBS box is immutable. At some point in the ...
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101 views

What is changing the network interfaces?

I installed Ubuntu 12.04 to virtual machine. I have edited /etc/network/interfaces like this: auto lo iface lo inet loopback auto eth0 iface eth0 inet dhcp Then I created a livecd.iso using ...
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1answer
119 views

Is there a way to emulate a DHCP server (overlay network) [closed]

I have created an overlay Level 2 network using VLAN tags with Open vSwitch. I want a Level 3 one so I need to give each VM a consistent IP address. I'd like every host on this VLAN to get an IP ...
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1answer
202 views

How can I configure dhcpd to only update the reverse zone in bind?

I've got dhcpd pushing updates to bind, and it seems to be working fine: named[24161]: client 192.168.10.1#59141: signer "dhcp_updater" approved named[24161]: client 192.168.10.1#59141: updating zone ...
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224 views

How to get host-name from DHCP server via Network Manager?

I can get hostname and ip address from DHCP server with invoking the script under /etc/dhcp/dhclient-exit-hooks.d/ directory as explained here on client side. I assigned host-name and ip address in ...
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101 views

isc-dhcp-server sends OFFER to ip and not broadcast

I'm trying to set up the isc dhcp server. My config looks like: ddns-update-style none; default-lease-time 600; max-lease-time 7200; # If this DHCP server is the official DHCP server for the local ...
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167 views

theforeman 1.4: foreman-proxied external dns/dhcp server puts provisioned domainname twice in dns server

I have a strange problem with our foreman. we use .localdomain as our internal domainname (eg. a host gets the fqdn test.localdomain) we use the standard dhcpd and named from CentOS6, both on the ...
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234 views

No A records created by DNS client on Windows Embedded Standard 2009

Windows Embedded Standard 2009 is basically Windows XP. I have thin clients running this OS which get configured through DHCP. I haven't been able to make them register an A record with the DNS server ...
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222 views

dhcpd log being flooded with duplicate and uid leases

I am runnig centos 6.4, isc-dhcpd-4.1.1-P1. I have over 100 desktop laptops on win7. my dhcpd.log file is being flooded with following messages Mar 3 11:08:06 tanaga dhcpd: DHCPREQUEST for ...
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2answers
88 views

Multiple DHCP servers [duplicate]

In what circumstances should you configure multiple DHCP servers on the same subnet? My understanding of using more than one DHCP server is that your clients will use the nearest DHCP which could be ...
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1answer
885 views

How can I set one hostname and IP for multiple MACs in DHCPd (isc-dhcpd-4.1.1-P1) on CentOS 6.x?

I am trying to get my DHCP server (isc-dhcpd-4.1.1-P1) in CentOS to give the same IP and hostname to two different MAC addresses (LAN and WLAN) on the same computer depending on which is connected.. ...
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1answer
163 views

How can i prevent TINC from relaying DHCP

I am running tinc in several NAT routers running Debian 7 Wheezy, the VPN works fine for months, except because i've set it up in switch mode it relays DHCP requests and answers over all the VPN. The ...
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2answers
105 views

How do I set up my office network so unqualified domain names resolve as if they have a default suffix added?

I want to type "go/something" in my browser address bar, and have my browser request "http://go.mydomain.com/something". The use case is where go.mydomain.com is our internal URL shortening service, ...
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1answer
68 views

DHCP wont release allocated IPs [closed]

I have a TP-Link td28151 router and I am using DHCP. I need to connect 40 devices to my router by Ethernet. I have set the count of my clients to 100, and my subnet mask is 255.255.255.0. I have ...
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1answer
1k views

Binding DHCP scope to particular network card

I have a windows 2012 server running DHCP. This server has in two network cards. I need to assign Ip addresses across two Vlans. Can this server be configured to assign addresses via scope1 via ...
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96 views

BMC nics are blocking DHCP offers from reaching target nic

In our environment we have a range of Dell and HP servers with two mac addresses for one interface, one mac for the BMC and one mac for the nic itself, but they share the same physical interface. ...
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2answers
211 views

DHCP complicates using IP Address Source in Amazon EC2 Security group settings

Background: I am learning to setup my amazon web services account. I watched a video tutorial(http://youtu.be/-xVyuLJZFYc), where they mention that within the security groups dashboard, one could ...
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1answer
243 views

How to configure linux DHCP servier for MPLS?

We are set up with a two-branch MPLS with a DCHP Helper on the Remote subnet. The DHCP service is running on a CentOS box. So I have two subnets: HostRange: 192.168.0.1 - 192.168.1.254 ...
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1answer
305 views

Building a Windows Server 2008 R2 (DNS, DHCP, AD, etc…) [closed]

I'm looking forward to build my own Windows Server 2008 R2 machine for a company that is in the process of establishment. I have some questions regarding the Windows Server. I'm pretty new to it .. I ...
2
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3answers
381 views

Can I run a single DHCP Server for all branches of an MPLS?

We have a two-location MPLS. I am told by the ISP that I can have a single DHCP server to service both branches. But I don't understand this. Consider this: Location1 (Host branch with the DHCP ...
3
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1answer
4k views

Move DHCP Scopes to existing DHCP Server

We have a remote Domain Controller that is running Server 03'. I'm wanting to retire this box and move to the 03' box that we have locally. I was looking at this guide, but wanted to ensure that it ...