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 - Client Uplink Is Not Working

Running a DHCP server, client(s) does not have up-link (0Mbps) and has a downlink (50Mbps.) I am setting up a gateway/router on a PC running Debian Wheezy with ISC-DHCP. I have 1 WAN (eth0) and 2 LAN ...
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205 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, ...
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183 views

Issuing 'ip dhcp relay information trusted' command on a VLAN interface

I was reading this article - Allowing option 82 in Cisco DHCP relay agents. It says As a security measure, Cisco IOS will not forward DHCP requests that contain Option 82 information and a ...
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222 views

Windows Server 2012 DHCP and OSX Devices

I've recently put together a small office network (around 20 devices) with an attached machine running Windows Server 2012. Our gateway router provided by our ISP was pretty useless and started ...
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295 views

Windows 7 Pro - DNS Servers changed on DHCP-enabled workstations over weekend, not sure how

This morning I came in to our SOHO office (>5 users) to reports of the internet not working. I tried all the usual simple fixes like cycling switches (each user has a switch at their desk) then I ...
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73 views

Binding ISC DHCPD to a virtual (heartbeat) interface

I had a DHCP server that acted as a relay endpoint and worked fine. let's say this is a solo machine with eth0 with an ip of 192.168.0.10 I needed to bring this server down and join it to a cluster, ...
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2answers
117 views

Rotating DNS servers specified by DHCP

I've got an OpenStack cluster running with about 200 CentOS instances and I've gotten a complaint from my hosting provider that the DNS traffic is getting to be too much for their servers. To address ...
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2answers
100 views

Unable to locate DHCP Server …

I am supporting a mixed Mac OSX and Windows environment. There is a rogue DHCP Server which seems to be providing the ip-addresses to Mac systems on the network. I have used both ZenMap and Wireshark ...
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1answer
70 views

DHCP server hardware [closed]

I have a user who needs to set up a DHCP Server for about 8000 users. Can I set it up on regular PC hardware. So far we have not set it up for more than 200-300 users. Are there anything which I need ...
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4answers
103 views

How does a host receive an IP if there's no DHCP server? [closed]

If a new host connects to a LAN without a DHCP server, how does it receive an IP?
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1answer
3k views

Issue with RHEL7 and disabling NetworkManager

Okay community, let's see if we can figure this one out, cause I'm out of answers. Where I work I am setting up a bunch of RedHat Enterprise Linux servers. There is a collection of RHEL6 and RHEL7 ...
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1answer
90 views

How can my server announce its presence to everyone in the network [closed]

The situation is as follows. I want to have an application running on a server. All of the desktops in the company has to connect to it. But I do not want the IP address of the server to be hard coded ...
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245 views

Advanced DHCP configuration (isc-dhcp-server)

We are managing our network by using DHCP and we sometimes add new subnets (IP Pools) to network through different VLANs. What we want to do is to manage all those IP pools from same DHCP server but ...
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2answers
230 views

Sonicwall SSO with NPS

I have a SonicWall where I want to enable the RADIUS SSO capability. The article for doing this states the RADIUS server Send the user’s IP address in either Framed-IP-Address or Calling-Station-Id ...
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56 views

DHCP User Class ID Notation (numerical vs. ASCII)

Creating a new DHCP User Class (on Windows Server 2008 (R1) 32-Bit) on can set a "Display Name" – here SuperDuperClass – and define the User Class ID numerically (1st & 2nd column) or ...
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1answer
90 views

cmd: create dhcp superscope

On Windows Server 2008 (R1, 32-Bit) I've got that far to create a superscope on the command line via cmd, not PowerShell (yay!) through netsh dhcp server \\SERVER scope IP.ADD.RE.SS set superscope ...
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2k views

Samba4 Internal DNS with DHCP Server

On FreeBSD we run Samba4 as a DC and until recently had our IP addresses handed out by the routers DHCP server. We switched to running a DHCP server on the FreeBSD machine with the following ...
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1answer
493 views

Server is assigned IP by GUID rather than MAC address in DHCP

I recently installed 8 new Dell PowerEdge c6220 II servers with dual 10G ports with CentOS 6. Each server has a DHCP reservation configured from a Microsoft 2003 DHCP server. I am using a Bootutil ...
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118 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 ...
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1answer
138 views

Configure and monitor Windows 2012 DHCP server with Powershell

We've recently been working with the documentation here to set up some access policies for a new DHCP server. I've been able to successfully import 600+ records with the Set-DhcpServerv4Policy -Name ...
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1answer
94 views

Static DHCP binding

Good time of day, SF people. I have created a manual DHCP binding entry on a Cisco router so that a client would always get leased to it. The clients wants to get the same address on both of his ...
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1answer
161 views

keepalived vip removed with dhcp renewal

I am having this strange issue where my vip is being removed from my interface when I receive a new DHCP renewal request. The logs shows the following: Jun 1 17:00:06 lb1 dhclient: DHCPREQUEST of ...
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1answer
580 views

On Windows 2008 R2, how do I back up DHCP if the DHCP .mdb database is always busy?

I get this from my backup software. C:\WINDOWS\system32\dhcp\dhcp.mdb : The process cannot access the file because it is being used by another process. C:\WINDOWS\system32\dhcp\j50.log : The ...
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1answer
5k views

dhclient: What does “RTNETLINK answers: File exists” Mean?

I wanted to update the DHCP lease of an Amazon EC2 instance, so I executed the following command: user@host:~$ sudo dhclient Following that, the system's DHCP lease is updated successfully updated. ...
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0answers
482 views

DHCP offer is unicast but DHCPACK is broadcast

My DHCP server broadcast DHCPACK 0xffffffff . it is not working on layer 3 dhcp relay agent . as it can not forward this broadcast message to my client. can any one help me from exactly the broadcast ...
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1answer
135 views

CentOS 6 DHCP server configuration

I have a CentOS 6 server running on a virtual host. The IP address on this host get assigned through DHCP host and another interface has an static IP ( a test network). I want to setup an private DHCP ...
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2answers
689 views

Assign fixed IP address via DHCP by DNS lookup

Preface I'm building a virtualization environment with Ubuntu 14.04 and LXC. I don't want to write my own template since the upgrade from 12.04 to 14.04 has shown that backwards compatibility is not ...
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3answers
1k views

Superscope DHCP leases and configuration set up

Hello I wanted to see if someone could help with a network problem I am having. Right now we have a super-scope and scopes of 192.168.50.1 and 192.168.51.1, as of now both are activated but only ...
2
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1answer
615 views

How to statically configure DNS servers on a Cisco router when the WAN interface uses DHCP?

I have a Cisco router (model 887VA, IOS 15.4) used to connect a LAN to the Internet via ADSL. The WAN interface uses DHCP: interface ATM0.1 point-to-point ip address dhcp I need the router to use ...
2
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1answer
78 views

Routing DHCP traffic over the internet

i'd like to know if it's possible for the internet to be between a DHCP server and the network it's "assigned" to? so basically, something like this: -------------- ------------- ...
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1answer
112 views

Is there a way to use Bind9 $GENERATE directive for rDNS of ranges bigger than /24?

The $GENERATE directive of bind9 makes it possible to autogenerate the reverse mapping for a range of IPs what is really helpfull for reverse dns of a dhcp range. But it seems that the $GENERATE ...
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30 views

failing to configure a dhcp scope under Oracle Virtualbox

I've got a problem configuring a link between WS 2008 and Windows 7 both running as virtual machines (under Oracle VM 4.2.something). Static addresses do well, with both ping 192.168.1.2 (client) and ...
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165 views

pfSense + Squid, Windows 2008 DHCP

I recently installed pfSense and Squid3-dev on a spare machine. It is now connected to the network and Internet is working alright. The problem is that I can't get my users to go through Squid proxy ...
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201 views

ISC DHCP Option 82 binary-to-ascii for host declaration

If the relay agent encodes the option 82 as binary data (as is the case with Cisco and Brocade systems, at least), How can one perform this match: host 10-24-24-9 { host-identifier option ...
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1answer
751 views

dnsmasq(as DHCP server) isn't working in KVM+libvirt envirmont

I'm using dnsmasq as DHCP server in VM environment. But It didn't working. I disabled basic DHCP feature in libvirt. <network> <name>default</name> ...
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1answer
191 views

Forwarding DHCPOFFER through bridged OpenVPN

Setup: host <---> OpenVPN-client with DHCP-helper <---> OpenVPN-server <---> DHCP-Server Except "host" everything is setup with static IP's and routing works fine. All stations can ping ...
2
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1answer
299 views

DHCP Administrators Group: No Permissions Granted on DHCP Server

I have added 'Group1' as a member of the DHCP Administrators group in my domain. Problem is, Groups and/or Users added to that group are not given permissions to view/manage the DHCP servers. How do I ...
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1answer
74 views

DRBL without modifying the DHCP: Possible?

Following up this question I'd like to ask: I use the company's network, but I have no access to the DHCP. I'd like to set up a DRBL server to be able to (re-)install a Linux image any time I want ...
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102 views

dhclient doesn't get/ack offer on macvlan interface

Following this is excerpts of logs when trying to configure a macvlan interface. For some reason unknown to me, dhclient doesn't seem to get/ack the offer, how come? --- /etc/network/interfaces auto ...
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1answer
148 views

Adding Logic to DHCP Relay Agent

In our environment we have 3 DHCP Servers used for PXE booting. 1 - FreeBSD PXE 1 - Linux PXE 1 - Disked Imaging (clonezilla-like device) Each device requesting DHCP is on a separate subnet ...
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0answers
401 views

Windows DNS clients can't update PTR records, but can update A records (not ACLs) [duplicate]

I have clients configured via GPO with the following settings enabled: Dynamic Update Primary DNS Suffix Register DNS records with connection-specific DNS suffix Register PTR Records: Register I ...
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2answers
112 views

Dns: two pointer (PTR) with same IP resolve to different hosts

I have a Windows 2003 domain. DNS server and DHCP server run on domain controllers. Most workstations have DHCP enabled. Sometimes I have weird network problems and when I diagnose them I can find ...
2
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1answer
244 views

How to assign multiple IPv6 addresses with DHCPv6 to a single interface?

This seems to be possible based on the spec rfc 3315 page 23: Excerpt: The configuration information in an IA consists of one or more IPv6 addresses along with the times T1 and T2 for the IA. See ...
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1answer
197 views

Using DHCP, is it possible to obtain an IP address & MAC address for a cluster? [closed]

I know that DHCP assigns IP addresses, but does it also assign a MAC address? Is this a commonly used paradigm for cluster/cloud computing? Perhaps DHCP could be used to dynamically assign a new IP ...
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2answers
304 views

Clients getting server ip as their default gateway

I have a problem to solve. Scenario: LAN network 192.168.190.0/255 (1 server, 60 clients) Server Windows 2008 (server roles: mail server, print server, dhcp server...etc) 5 pxe-clients Debian ...
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1answer
102 views

Don't want isc-dhcp to ever reallocate reserved ip even if hosts is down

I've allocated ip's to some systems through dhcp and then made entries in dhcpd.conf for reservation so that these ip's are not allocated to other macs. But when the system with reserved ip is offline ...
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1answer
126 views

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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1answer
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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0answers
1k views

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 ...
2
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1answer
134 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 ...