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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Sonicwall L2TP Server is using a “phantom” internal DHCP server

Following a few articles on options 121 and 249, I'd like to push out routes to the L2TP VPN clients using the internal DHCP server on the Sonicwall. However, the Sonicwall seems to be using a ...
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167 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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64 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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538 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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163 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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546 views

How to manage gateway assignment in different VLAN's with 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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42 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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318 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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477 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 agent....
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175 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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65 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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121 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 LAN/...
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568 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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457 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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146 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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267 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 dhcp6....
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40 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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1k 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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213 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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172 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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423 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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150 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 ...
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657 views

Slow Starting DHCP Client Service - HP Thin Clients

We have recently began adding XPe thin clients to our domain in preperation for a new citrix environment. One thing that has been picked up on in testing is that they appear slow to boot. The issue ...
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429 views

Sonicwall bulk DHCP reservation

We are migrating over to using SonicWALL as our firewall from Microsoft Forefront TMG. I have managed to export our DHCP Reservations from the DHCP Service running on our TMG box but want to avoid ...
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143 views

Given IP address, but can only ping sometimes

I have a debian server that acts as a wifi router and DHCP and FTP server. I want to connect to this server using a Canon Wireless File Transmitter. I can connect and receive an IP address. I can ...
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1k views

RRAS with DHCP when the IP pool is on a different subnet

I run a small business network and the last couple of days I have been setting up some equipment to add VPN capabilities to our network. I've got the following set up: Windows 2008 R2 with RRAS - ...
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1k views

DHCPD Offering ip address on wrong subnet

I just recently added a new subnet for our wireless network to our DHCP configuration for the 192.168.254.0 subnet. Most of the time when wireless clients connect it works just fine. However, ...
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256 views

Can multiple VLANs be provided with multicast addresses by a single MADCAP server?

Can a single DHCP server provide dynamic multicast addresses for hosts in many VLANs using MADCAP, just like it can provide hosts with unicast addresses via ip-helper? Or from a Cisco perspective, ...
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487 views

Logging dhcrelay, other than redirecting the -d debug option?

I am hoping to find a way to log the activity of the isc dhcrelay service, apart from redirecting it's "-d" debugging output to a file and logrotating it. I need a long-term record of what the ...
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153 views

Multiple NICs config, disconnecting eth0 disconnects all other interfaces

Good Day, I'm using hardware that streams data, it has 4 Lan ports and is running Linux 2.6.23. I've run into some strange behavior with ARP tables reporting multiple IP addresses to single MAC ...
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151 views

Wireless router not allocating correct IP addresses

I have a WAG320N wireless router setup as a DHCP relay to my Windows 2003 R2 Enterprise server. The IP of the router is 137.248.21.1 The IP of the server is 137.248.21.10 The scope for the server is ...
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542 views

How can you route DHCP requests through a non-default gateway?

I'm hosting some KVM virtual machines on a server with two NICs, eth0 and eth1. I have two networks 192.168.100/24 and 192.168.200/24. I have set up bridges as per http://www.linux-kvm.com/content/...
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334 views

Windows Server 2008 DHCP with RRAS

I have a Windows Server 2008 R2 which is a member of a domain, but is placed in a remote location. The server is directly connected to Internet. Clients need to access a particular insecure TCP ...
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340 views

associate dhcp requests with subdomains in dnsmasq

I have dnsmasq running as a dns server with a number of linux boxes using static ips that run several virtual hosts on subdomains. I currently have the following address line in my dnsmasq.conf to ...
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17 views

Can Windows request multiple addresses with different client identifiers?

Is it possible for Windows to request multiple IP addresses for the same interface by making requests with different client identifiers? (Similar to the 'pseudo interface' functionality in Linux's ...
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12 views

How to get unbound to forward DDNS updates?

We use bind on CentOS as our primary name server but also recently (again) started using unbound in front of it (on port 53) so that domains can be (partially) overridden transparently. The only ...
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19 views

powershell: Remove-DhcpServerv4Lease does not remove existing leases

I want to delete all DHCP leases and reservation from server WSKELLER. From the documentation I seem to understand that this would be accomplished with: Get-DhcpServerv4Scope -ComputerName WSKELLER | ...
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25 views

powershell: delete all DHCP reservations/DNS entries in a scope/forward/reverse lookup zone

I have made a little powershell script that takes a fixed-width text file and populates a DHCP scope, a DNS forward lookup zone, and a DNS reverse lookup zone. My next step shall be to have the script ...
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13 views

Sending custom DHCP option to server with dhcpcd

I've been trying for several days to configure dhcpcd to send a non-standard option to a DHCP server without any success. On the other hand dhclient works fine. I need to send an option with code 90 ...
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28 views

Cisco 6500 - spike of DHCP_SNOOPING-4-QUEUE_FULL causing clients to lose connectivity

Today we had an incident that started with people complaining they couldn't connect to our wifi after coming back from lunch. Long story short, clients were no longer able to get IP addresses from ...
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30 views

dhcpcd: static IP without cable attached

I'm trying to setup a Raspberry Pi 3 (debian jessie) using static ip. It will also be running a dhcp server. It will not be connected to a network. From time to time it will be connected to another ...
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16 views

Linux - bind DNS+DHCP@LAN - dynamic update not working

This is my first attempt to make bind dns and dhcp server on Linux, and I have some issue. Have this: one DHCP/DNS server (hostname:services) 192.168.3.10 few hosts (host1, host2, ...) few vlans (...
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23 views

How to setup DHCP Relay in Debian 8?

I have three VMs. One VM is a DNS and DHCP server, one is a Linux router running Debian 8 and the last VM is a test machine. I am trying to configure the Debian 8 machine as a DHCP relay. I have ...
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43 views

DHCP server assigning same IP address even if Computer is connected in different VLAN

DHCP Server OS - Windows Server Standard 2008 R2 DHCP Client OS - Windows 7, Linux based OS etc.. I have configured DHCP Server on Windows Server Standard 2008 R2 with SuperScope. Let assume that i ...
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39 views

static network setup still using DHCP

I'm configuring an Ubuntu 14.04LTS server on our internal network. Everything works and runs as expected. Its assigned a static IP, here's /etc/network/interfaces # The loopback network interface ...
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16 views

De-authenticating Wi-Fi without turning off the device

I have established Wi-Fi access point using hostapd and the IP address is configured via DHCP. This is my configuration file hostpad.conf interface=wlan0 driver=nl80211 ssid=User hw_mode=g channel=...
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44 views

Get an IP from DHCP behind a few routers

I know that there few posts for this subject (i read them all) but they don't cover my case I'm new in the company and having some beginners problems... The context: Users LAN - SW Access - SW ...
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53 views

How to configure isc-dhcpd-server to update reverse zone without client pre configuration?

I'm trying to set up isc-dhcpd-server from ubuntu 16.04 (4.3.3-5ubuntu12) to configuring heterogeneous network with ubuntu, windows, macos, other ip devices. I'm already setuped bind to store ip ...
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28 views

Do DHCP server messages have to be sent from port 67?

I know DHCP servers receive messages (e.g. Discover, Request) at port 67. Can a DHCP server send responses (e.g. Offer, ACK) to port 68 from a port other than 67? I thought the client should not ...
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10 views

What data is stored in DHCID RR by rfc 4701 (in lay terms)?

To understand what is going on my dhcp server I need to understand what is stored in this record that idenities my dhcp clients. I have long read this standart. But cannot understand. In lay terms I ...