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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VLAN ID over DHCP for Management Interface of Fortinet FortiAP

When configuring the FortiAP device it's desirable to configure the VLAN ID for the tagged management network. Accordingly to the manual it's possible to do so by "telnetting" to the FortiAP device ...
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2k 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 ...
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26 views

How did AirPort's DHCP “Welcome Message” work?

I remember that Apple's AirPort base stations used to have a DHCP "Welcome Message" feature, that would display a custom pop-up dialog when computers connected to the network. How was this ...
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77 views

DHCP Failover works but no DNS available

I have a DHCP failover (load balance) configured. DHCP failover works but the clients are not getting any DNS entries. We have 2 DNS servers using AD-integrated zones, and the failover is between ...
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52 views

“Register this connections address in DNS” - unable to automatically tick this box with a VPN connection

Hoping you can help. We have about 70 Microsoft Surface's in our network and they all have a VPN connection that is deployed from our SCCM 2012 Server. the problem I have is they will not update DNS ...
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161 views

DHCP fault tolerant servers: Split pool or failover?

I need to replace an aging DHCP server by a fault tolerant solution. I consider using the ISC dhcp server solution which can be setup either as split servers serving non-overlapping ip ranges or as a ...
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223 views

ISC DHCPD IPv6 for multiple interfaces

I want to assign multiple IPv6 to a server with multiple NIC. As IPv6 RFC defines, each server has a unique DUID that can have one of the 3 formats (LL, LLT or enterprise). And each NIC has an IAID. ...
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216 views

Why is qemu issuing a DHCP discover after it receives a DHCP offer

I'm having some trouble seting up network on qemu. I'm trying the easy option (user). The qemu command I run is this: ./qemu-xilinx/arm-softmmu/qemu-system-arm \ -M xilinx-zynq-a9 -m 1024 ...
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795 views

How to config libvirt network setting about disabling dnsmasq “except-interface=lo”?

Here is the thing. My VMs run with libvirt and use default network libvirt-provide, and I've mad each VM registers its hostname to dnsmasq set by libvirt. so I want to look up its hostname for ...
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3k views

Setting Shoretel phone time correctly with dhcpd

Our Shoretel 230 phones are not picking up time service correctly and thus, the time on the display is wrong. When I go to the diagnostics of the phone, they are using a wrong time server (old). Here ...
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261 views

WBAdmin SystemState Problems

I recently installed DHCP on my 2008R2 Server and now Backup Exec and WBAdmin/WSB is having System State issues. Essentially, after some research, I came across a handy tool called VSHADOW which has ...
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1k views

vmware DNS in host-only configuration

I want to connect a Linux VM running in VMWare on a Windows 7 laptop to an enterprise network using host-only configuration. I was able to setup bidirectional routing between "host-only" VMWare ...
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379 views

Is using GIADDR when relaying DHCP requests beneficial?

I am setting up three Juniper EX3200 switches simply named 1,2, and 3. Switch 2 will have two VLANs, one being the internet uplink from the Firewall and one being the gateway for the Workstations. ...
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833 views

WDS server & Cisco ASA (DHCP)

My setup: WDS server (w2indows 2003 R2) located on subnet 10.1.1.10 Various site locations all on different subnets. Eah site has a Cisco ASA firewall configured to respdon to DHCP requests. ...
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972 views

Cisco ASA - DHCP Relay doesn't seem to be working consistently

I'm having an issue where some users on one of our DMZ networks aren't getting a DHCP address from the Windows DHCP server on our internal interface. Being that not everyone is affected is making ...
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2k views

Windows 7. DHCP option 121 works partially. But it working fine for XP and Mac OS X

I've setup pptp server on cisco router today. The remote client IP addresses are assigned on this cisco router by DHCP. Also I set up option 249 and 121 to provide classless routing for my VPN ...
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54 views

Create Bridge interface on linux board

My current configuration and topology look like below: +++++++++++++++++++++++++++++++++ +++++++++++++++ | Linux Board eth0 | | Switch | | with openWRT ...
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83 views

Use Framed-IP-Address RADIUS attribute for IP allocation with DHCP on Windows Server 2012R2

I have configured a DHCP server on Windows Server with an NPS Policy, connected to a FreeRADIUS2 server running on pfSense. Authentication is based on MAC address. If MAC address is not present in ...
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29 views

How to set up a simple Cisco ISG config for controlling internet access

First off, here is my config so far. http://pastebin.com/fV2NGCE2 I've gone through a few guides online and the 15.2s manual and the xe3 manual for Cisco's ISG (intelligent services gateway) and ...
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97 views

Create IPv4 reservation with DUID in Windows Server 2012 DHCP

Can I configure reservations for IPv4 addresses in Windows Server 2012 DHCP for systems which send DHCP requests with a DUID for their client identifier (Option 61)? I have Linux (e.g., Fedora 21) ...
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109 views

2008R2 DHCP Server Becomes Unresponsive

At the end of 2013, our single Windows Server 2008R2 DHCP server started becoming unresponsive once every week or so. The server itself was up, but the DHCP server was unresponsive. Attempts to ...
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43 views

dhcp relay with failover to local service

I'd like to set up a dhcp server which normally relays to a central site, but has a pool of addresses to hand out if the link to the central site goes down. I'm using isc dhcp server on Debian, but ...
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72 views

ipv6 address assignment via local server from isp assigned block

I have been looking around and found the information confusing as best. Is there a way to have a server "recieve" the /64 ipv6 block from the isp and then use dhcp or something to assign it out to ...
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257 views

One server has multiple IP address leases but just one adapter and no dhcp reservations?

One of our servers' has multiple (10) DHCP Addressleases and I don't know why. The server itself has only one adapter and even if I execute ipconfig /all I only see one IP address defined. Even in the ...
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372 views

How to create a link between GNS3 and a VMWare Workstation VM that is totally isolated from the physical host?

My physical host machine runs windows server 2012 R2 with a DHCP server. I have the following topology in GNS3: Windows Server is the physical machine, it is connected to both VMNet 2 and VMNet 3 ...
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77 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). ...
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93 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 ...
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49 views

force dhcp server to always run

I have an Ubuntu machine with two Ethernet network interfaces and on one of them I am running a DHCP server (isc-dhcp-server). I noticed that the server daemon stops running whenever I suspend the ...
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964 views

DHCP_HOSTNAME isn't working consistently in RedHat 7

Under RedHat/Centos 6.x I used DHCP_HOSTNAME=`hostname -s` in /etc/sysconfig/network-scripts/ifcfg-eth0 to pass client hostname to DHCP for registration in DNS and this worked flawlessly. I'm now ...
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100 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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316 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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3k 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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622 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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33 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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208 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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254 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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76 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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50 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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89 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 ...
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394 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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351 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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281 views

Laptop using DHCP lease from another network

We have a laptop with intermittent wifi connectivity problems. Rebooting often helps. Today while digging around I noticed that its DHCP IP address and gateway are not addresses on our subnet. The ...
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100 views

BOOTP on Juniper 4200 stack works one one subnet, not another

I have a Juniper Stack that connects vlans 10,11 and 50. 10 is servers, 11 is desktops and 50 management. Bootp is redirecting DHCP requests to a AD box on 10.x just fine for 50 vlan, and worked well ...
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192 views

How to send several instances of the vendor-specific options to a DHCP server using dhclient?

I need to send vendor-options to DHCP server using dhclient (ISC). I've added following lines in the dhclient.conf: option dhcp6.vendor-class code 16 = {integer 32, integer 16, string}; send ...
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39 views

Modems unable to acquire dhcp IPs

I work at an ISP where we use routers (7200) for dhcp. I recently reloaded one of our dhcp routers because we had complaints from many users unable to connect and the dhcp database file it was ...
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701 views

ip-helper forwarded DHCP request not reaching DHCP server

The situation--I'm trying to centralize our DHCP services to a single Windows 2008 R2 Server (we're switching to L3 switches that don't provide DHCP services). We currently have Cisco routers at ...
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159 views

ntp.conf being rewritten in Fedora

Something rewrites my ntp.conf on reboot. It's easy to google that DHCP client may do it, and there is a simple solution for that. Just including -N option into dhcpcd_eth in /etc/conf.d/net should be ...
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128 views

Checking Statement of Health (NAP) info on Linux using Dhcp and Radius

I have a Linux DHCP server and windows clients. I want my DHCP server to assign an IP address from a network let's say 10.6.3.0/255.255.255.128 if the client has it's firewall enabled or an IP address ...
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290 views

How do I configure stateful DHCPv6 in Windows Server to allow clients to ping each other?

How do I configure stateful DHCPv6 in Windows Server to allow clients to ping each other? I would like to configure my Windows 2k8 DHCP server to distribute IPv6 addresses in my office network that ...
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128 views

DHCP Requests out of line with lease time, inordinate amount of requests to server

Environment contains an OS X 10.6.8 Server with OS X 10.8.2 clients. DHCP is running on server with a lease time of 1 Day (86400 seconds). The system log is flooded with DHCP REQUEST/ACH messages ...