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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460 views

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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3k 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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2k 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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3k 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 clients....
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68 views

How can I identify a rogue IPv6 DHCP server on my LAN?

This will be kind of a long post, but I want to give complete information. I have a home/business LAN with isc-dhcp-server running an ipv4 dhcp server and bind as a DNS server running on an ubuntu ...
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72 views

How to create DHCP reservations with long hardware address?

DHCP is managed by a Windows 2008r2 server. I want to convert a lease into a reservation so the IP will be fixed. Normally, I create a reservation based on the assigned IP address, and when the lease ...
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93 views

Cannot renew DHCPV6 lease in SLES12

I need to renew the lease of a certain SLES12 box. The machine is configured to use IPv6 only and so far I have tried the following: From here: dhclient6 -r -v eth0 && rm /var/lib/dhcp6/...
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66 views

Did I cause this DHCP failure?

I asked this here, it was requested that I move it to this forum instead. I have a question that I need some counsel on concerning DHCP and what may happen in a certain situation. I have a case ...
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91 views

Authentication and logging of users for a Wireless ISP?

I have to upgrade a Wireless ISP's (WISP) network. Their current setup consists of a router (Mikrotik RouterBoard 1100AHx2), Ubiquiti Rockets (with sector antennas) for clients, and Ubiquiti ...
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19 views

DHCP Server not responding to relayed DHCP DISCOVER

I'm currently segmenting our network in various subnets. We already have a DHCP server as a part of our Active Directory (Server 2012). I want to use this server for all subnets so I need to work with ...
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60 views

DHCP client not getting IPv4 address from a DHCP server

I configured a DHCP server on a VM in VirtualBox. This machine has 2 network adapters, enp0s3 - NAT (from where I have my network connection) and enp0s8 - Internal Network (intnet). DHCP server is ...
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35 views

Abnormal DHCP Android device traffic cannot be identified

Hi Serverfault community members. I've been trying to identify the source of an abnormal broadcast traffic generated by some Samsung Android devices with no success, so I ask for your help. I have ...
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80 views

Creating additional VLANs on Cisco SG200

I would like to create 2 separate VLANs using a Cisco SG200-series smart switch (layer 2) where the devices would not see each other, while being able to connect to the internet. The setup is simple, ...
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71 views

DHCP Discovery being Ignored

I'm having some real issues with a DHCP server I've setup. I'm at my wit's end, having found no answer anywhere to this problem of mine. Here's the setup: I have a CentOS server machine, running ISC'...
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532 views

Assign a public ip to openvpn client

For learning purposes, I'm trying to set up openvpn server, so that each connected client would get a unique public ip address. I have a vps server and I ordered extra 8 static ips and they are ...
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141 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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153 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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2k 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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5k 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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894 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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214 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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329 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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274 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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985 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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5k 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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279 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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857 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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354 views

ISC-DHCPD failover, Modifying host definitions via OMAPI

Background: I'm working on replacing my single DHCP server with 2 in a failover configuration. When I do a DHCP request I see the lease is created in both dhcpd.leases files on each server. However, I ...
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983 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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1k 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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26 views

Setting dnsmasq_config_file with Puppet managed OpenStack installation

Our OpenStack installation is rolled out with Puppet. We use the excellent puppetlabs-openstack module for that. Due to the slow turnover cycles we are still stuck with version 5.0.2, right now we ...
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45 views

Interface being deleted

I have a cluster consisting of CentOS6.5 and CentOS7 virtual machines. I've come across an issue where the network interface, eth0, is being deleted for reasons unknown and I'm looking for help on how ...
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24 views

Why was the previous authenticity of the host ignored?

I'm on Ubuntu 14.04 Desktop. I have just logged into other machine (Ubuntu 14.04 Server) using ssh in one terminal. I'm still connected. When I did scp in another terminal (opened earlier) to move a ...
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26 views

DHCP: bad configuration fixed-address?

My configuration of DHCP is: dns-update-style interim; default-lease-time 86400; max-lease-time 86400; authoritative; log-facility local7; subnet 192.0.1.0 netmask 255.255.255.0 { pool { option ...
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28 views

Sonicwall DHCP timeout after AWS VPN tunnel

I have just setup an AWS VPC with a hardware VPN tunnel to our datacenter via a Sonicwall NSA 4600. Everything is working fine with the VPN between Amazon and our datacenter, but the DHCP has stopped ...
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46 views

dnsmasq dhcp-range for different access points

Is there a way to configure dnsmasq to hand out IPs from different range to different wireless access points? I have a basic Asus router configured as access point (it does no routing and doesn't run ...
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33 views

ip dhcp excluded-address command no work

I want to provide 1.1.1.101 to 1.1.1.126 using dhcp pool. Here is my configuration no ip dhcp use vrf connected ip dhcp excluded-address 1.1.1.1 1.1.1.100 ip dhcp excluded-address 1.1.1.127 1.1.1.254 ...
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69 views

DHCP failover/DNS not working when primary server is offline

In a VMware environment we deploy daily many new virtual hosts and for this we need a failover DHCP/DNS. Based of CentOS 7 I setup two virtual hosts as failover DHCP and dynamic DNS (dns01/dns02). I ...
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25 views

Weird behavior with multiple pool inside shared networks on isc-dhcp-server

I have a weird behavior on my dhcp-server, I am using a load balance configuration and using multiple pool inside that shared-network, I have this configuration: shared-network "my-shared-network" { ...
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14 views

Setting up developer instance dns

We have a bunch of developers that are coding webbased solutions. They want to share the solutions on their local machines with projectmanagers and QA's etc. to let them access, test and demo the ...
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74 views

Dell PowerConnect 5324 ignoring DHCPOFFER

I've recently procured a "new" Dell PowerConnect 5324. The firmware is updated to the current version and most of it works just fine. The exception is DHCP. When I enable DHCP, it cannot seem to ...
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128 views

AD DC for domain could not be contacted

We are using samba4 on Debian 8 as a AD DC and isc-dhcp on another Debian 8 machine as a DHCP router. The problem is that if I set dhcp ip on a windows client I can't join the domain. If I add the AD ...
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139 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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266 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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279 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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120 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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98 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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724 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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627 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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135 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). ...