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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1answer
186 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 ?
4
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1answer
1k 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
64 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 ...
2
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1answer
285 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, ...
0
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1answer
208 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 ...
2
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3answers
407 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. ...
2
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1answer
85 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 ...
3
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1answer
538 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
557 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
449 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 ...
1
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1answer
40 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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0answers
109 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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1answer
466 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 ...
2
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1answer
470 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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0answers
40 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 ...
0
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1answer
79 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
627 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 ...
3
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2answers
1k 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
1k 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 ...
0
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1answer
113 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
129 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 ...
1
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1answer
262 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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2answers
94 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
1k 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.. ...
2
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1answer
187 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
121 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, ...
0
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1answer
78 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 ...
0
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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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2answers
258 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
292 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
323 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
487 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
6k 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 ...
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0answers
81 views

Cisco 5508 - One WLAN not pulling from Windows DHCP

We have an existing Cisco 5508 doing all our WLAN/WAP functions. Windows 2008R2 DHCP server. There are currently 4 WLAN's, functioning properly. We are running out of addresses on our corporate ...
0
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1answer
302 views

Using isc-dhcp-server to allocate addresses from subnet different from server subnet

I'm trying to break my network into different subnets. Server is located into 192.168.15.0/24 subnet. I have the following declaration in my dhcp.conf: subnet 192.168.15.0 netmask 255.255.255.0 ...
2
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1answer
1k views

Very long 'Unique ID' in Windows 2008 DHCP Server Leases - why? What is the device?

I notice on one Windows 2008 R2 DHCP server the device with the first IP in the range has a strange looking Unique ID of the format ...
0
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1answer
752 views

Is there any difference between DHCP helper & DHCP relay agent [closed]

The DHCP helper is the device that knows where the DHCP server is The DHCP agent knows where the helper is on the network and points a device to the router or switch ..
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0answers
350 views

2 DCHP servers and 1 WDS server, same subnet

I have DC1 hosting DCHP. DC2 also has DHCP although it is configured as a failover DHCP server. I have WDS installed on DC2. So I have DHCP and WDS on same server. I have tried all kinds of DHCP ...
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1answer
58 views

Determining if imaging is required with WDS

We are a business of under 200 PC's that are looking at implementing preventative maintenance tasks such as regular imaging or updates but would like to see if there is a better method then IT coming ...
2
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1answer
366 views

Can Windows Server 2003 DHCP Server assign multiple IP Addresses to a single host?

I have Windows 2003 Server handling DHCP for our network. We use reservations to assign some hosts IP addresses. Is it possible for the server to assign a single host two IP addresses in different ...
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1answer
2k views

Shouldn't we exclude a static IP from the DHCP pool?

In my office, I have a printer with static IP 192.168.0.254/24. Normally, it should be excluded from the DHCP pool in the router. So I just set the DHCP pool to be in the range of 192.168.0.2/24 - ...
3
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2answers
2k views

Force DHCP Reservation Updates to Secondary DHCP Server in Windows Server 2012 R2

I have setup and configured two DHCP servers on my private network in load balancing mode as outlined in the following technet article: http://technet.microsoft.com/en-us/library/dn338979.aspx Both ...
0
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1answer
38 views

2 NICS using Windows Server 2012 as “gate”

I want to use my windows server as a gateway and DHCP for my local network. It have 2 NICs where one will be connected to the internet and the other to my local network. There are no router on the ...
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0answers
319 views

Libvirt providing bootp options without being configured to do so

I have a virtual network configured in libvirt and configured to provide DHCP (via dnsmasq) but not configured to provide bootp information (see below), but when I boot an iPXE ISO and look at the ...
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1answer
74 views

DHCPD: permanently leased IP being offered (twice) to random node and assignee

Greeting. On a small LAN (< 20 networked devices) with a cento6 5.9 server/dhcp-3.0.5-33.el5_9). I am configuring permanent leases thusly (dhcpd.conf, partial): range 10.115.64.60 ...
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1answer
944 views

Cross-VLAN sharing and auto-discovery of selective resources

I have a network with several VLANs that each contain resources or clients with different access rights. For simplicity, let's say I have 3 VLANs: ID 10: Contains privileged clients and private ...
0
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1answer
155 views

Migrating from static IP adresses to DHCP

I've just landed my first job as a sysadmin, and my workplace is still using static IP adresses. Informations about adresses are kept in a textfile that is not up to date. So, my first task here will ...
0
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1answer
59 views

Is there a Linux DHCP server that supports assigning different DNS servers to a given host?

Is there a DHCP server that runs on Linux which will allow me to configure what DNS servers get assigned to which host? E.g. If I have 192.168.0.10 and 192.168.0.20 on my network, I'd like to make it ...
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1answer
816 views

DNS A records disappear, but PTR records still remain

We've been having issues with DNS records dropping. Usually it is from DHCP reservations, like printers. Yesterday it was two of our main servers, also DHCP-reserved. Right now I'm looking at a ...
0
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1answer
235 views

Cross over cable network with DHCP On in one machine [closed]

Network novice here. I need to setup a small network (cross over cable) between a windows server 2008 and Raspbery Pi. And I need to have DHCP service running in my windows server and it should assign ...