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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Can I include another file from /etc/dhcpcd.conf? [on hold]

Is there a way to "include" another file from the /etc/dhcpcd.conf file? I have a web server running on a (headless) Raspberry Pi. I'm writing a cgi script that lets me see the current fallback ...
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1answer
15 views

pfsense NAT router - “live with” double nat (airport express)

I have a setup that have worked for years with a fiber to a NAT router to clients. Clients are typically cheap NAT routers of any kind. Setup like this Fiber from ISP | Router, pfsense -WAN - ...
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1answer
25 views

How to configure dhclient on CentOS to get IP from a specific DHCP server

I have a situation where I am able to launch CentOS 6.6 images on a subnet such that the VM instances get their IP addresses from the virtual gateway of the subnet. Now this gateway has gone wonky and ...
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1answer
41 views

Multiple DHCP servers in multiple subnets, one DNS server

I have existing network with two subnets - one is the main company subnet (192.168.1.0/24), the other is completely separate VLAN for Guest Wireless and BYOD devices (192.168.2.0/24). There's Windows ...
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1answer
17 views

Is it possible to configure proxy setting through dhcp?

I have a small LAN with 12 devices connected to it, ubuntu box running dnsmasq acting as a dhcp server and another ubuntu box acting as a web proxy. Is it possible to configure all of the devices in ...
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15 views

Setup server hosting hyper-v as a router

I have a windows 2012 server hosting several windows VMs by hyper-V. As I was building this infrastructure at home all VMs got IPs assigned from my home router (DHCP). So both hyper-v manager and VMs ...
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1answer
37 views

Using dnsmasq to service multiple subnets

I'm pretty new to using dnsmasq, and I would like to keep utilizing it in my lab environment. However, being new, I am unsure what commands/files to use. I've spent two days doing research and ...
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14 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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1answer
17 views

Assigning different IP from range on dnsmasq DHCP server

I have an installed dnsmasq DHCP server. I want to assign different IP address from defined range. For instance my IP range is 10.11.12.10 - 10.11.12.50 but I want to assign different IP ...
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31 views

DHCP binding on Windows Server 2012 R2 won't stay checked

I've got a DHCP role running on a Windows Server 2012 R2 machine. The scope is set in the proper IPv4 subnet. When I select "Add/Remove Bindings..." I see both the NIC with the configured static IP ...
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13 views

DCHP Policies Server 2012R2

Tell me, please, is it possible to define a policy on the Windows Server 2012R2 DHCP which lease IP address to workstations based on the host name? For example, there are a host OFF-CONTOSO. I want ...
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17 views

DHCP reservation for Forefront TMG VPN clients

We have a remote computer connect to our cloud VPN network. VPN server is Forefront TMG. FF TMG is configured to server IP addresses based on the netowork's DHCP server. In DHCP I see leases to VPN ...
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1answer
29 views

Configure StrongSwan to work with DHCP

I have implemented a StrongSwan VPN server and would like to configure it to dynamically assign IPs to the end client. The VPN works if I give it an IP range however not if I set it to DHCP. This is ...
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2answers
50 views

Will computers connected to a switch have a different ip? [closed]

I want to set up a network switch with several servers connected to it that must be port forwarded. Please refer to the below diqgram for my setup: ___Computer 2 | ...
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1answer
48 views

When installing Windows Server 2012 R2 Essentials, should DHCP be turned off first on router? [closed]

Or should it be left on for setup, then DHCP on router turned off after setup so server does DHCP. Thank you.
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43 views

Windows DHCP Clients Randomly Revert To Old DNS Servers

In this one network I have, I am moving from a linux infrastructure to a Windows infrastructure. This has been a staged process. Originally there was no Windows infrastructure. DNS, NIS, and DHCP ...
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4answers
856 views

When the internet is down, so is Active Directory?

I am setting up business servers for a small office use with 5 users / 5 devices or so. Nothing elaborate here. I've set up a SINGLE Lenovo TS440 server (single NIC) with Windows Server 2012 R2 ...
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1answer
46 views

Getting “Connection timed out” on a tftp server though it seems everything is configured correctly, what could be the reason?

I've just installed a cobbler (with tftp/dhcp) server on a CentOS 6.6 machine at work. I've configured tftp to run under xinetd and the conf file looks like so: service tftp { disable ...
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1answer
16 views

Is it possible for networks to be assigned the same external ip [closed]

Is it possible for networks to be assigned the same external ip, not necessarily simultaneously, for example being assigned another users old external ip address? I am a programming student but my ...
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1answer
42 views

Auto DHCP IP Phones to a different subnet

I'm standing up a 3CX PBX system in my office and would like to set my DHCP to assign IP phones a 10.10.8.x address, while giving everything else a 10.10.0.x address (our current net). What would be ...
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0answers
32 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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74 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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2answers
44 views

Is there any lower bound on DHCP lease time?

Currently I am facing an issue to change the value of the DHCP lease time option in the server and configuring the the client with the same value. I have used dhcp-server package and have put the ...
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1answer
35 views

Certain PC's on vlan using link local 169.254.x even though communication present to DHCP Server?

I would really appreciate thoughts and opinions on this strange issue experienced recently. Consistent behaviour noted from problem clients: Up to a certain time in the morning user PC's were ...
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1answer
43 views

Cascade 2 routers with dhcp [closed]

I'm wanting to cascade 2 routers, one is a Linksys E3000 Router, the other is a wireless Cable Modem/Router made by Arris. As of now their cascaded via WAN to LAN, in other words, the internet port ...
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32 views

specific IP Attribution with isc-dhcp-server with freeradius authentication

I would like to assign specific address to my clients, regarding their radius authentication. For exemple, user1 (group user) authenticate on radius, dhcp gives him 192.168.1.1 as IP user2 (group ...
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27 views

Polycom phone not requesting DHCP offer

My Polycom IP550 phone is not requesting the DHCP address that my windows 2012 server offered it. I have done a wireshark capture on a mirrored port on our switch and you can see that the phone is ...
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40 views

Under CentOS6.5, DNS Server build with DHCP, Client can't ping domain-name, but IP can

I'm trying to build a DHCP and DNS server. I check that client ip is ok to capture (11.11.0.1), ping server ip (11.11.0.9) is ok, but ping domain name (example.com) is not ok. On the server, ping ...
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2answers
134 views

Can I disable DHCP client on my Windows 2012R2 server (which uses static IP)?

I looking through the services list on some of the Windows 2012 R2 servers here and noticed that DHCP client is running, despite the servers using static IP on all interfaces. This seemed like a ...
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1answer
53 views

Under Centos 6.5, restart dhcpd with dhcpd.conf failed: expecting IP address or hostname option domain-name-servers “11.11.0.9”

I'm trying to build a DHCP and DNS server. I check that client ip is ok to capture (11.11.0.1), ping server ip (11.11.0.9) is ok, but ping domain name (example.com) is not ok. On the server, ping IP ...
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1answer
34 views

How to set DHCP IPs of stanard lxc containers?

When you create some containers on a host, e.g: sudo xlc-create -n container1 -t ubuntu sudo xlc-create -n container1 -t ubuntu the lxs system creates IP address for the hosts on a new subnet, e.g. ...
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1answer
36 views

Setup Windows Deployment Services when option 66 is already in use

I am currently trying to setup WDS at my company. The WDS and DHCP are running on two different servers. However, our IP telephony system is currently using option 66 (Boot Server Host Name) in ...
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1answer
25 views

DHCP attribution without DHCP client

j'ai un serveur DHCP qui attribue des IP selon les adresses MAC des clients. J'ai un client qui n'a pas de client DHCP installé (pas que je sache). I have a DHCP server (on linux) which gives IP ...
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2answers
53 views

How to block DHCP traffic using iptables

First let me describe my environment: There is a VM (CentOS) acting as a gateway The gateway VM has to NICs, eth0 connects to public network, eth1 connects to private network eth0 get IP from public ...
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1answer
30 views

Different lease time for all clients DNSMASQ

We are running a small DHCP server on Raspberry PI using DNSMASQ. We need to give out lease time based on a script that gives us the time span. This means that all clients will have a different lease ...
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2answers
153 views

Debian Jessie : dhclient always active

On fresh installs of Debian Jessie, after I set a static ip address, the DHCP client is still active. It even revert back to the dhcp ip address when the lease is renewed. step 1: I modify ...
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1answer
65 views

Multi Vlans with one DHCP server [closed]

We have multiple vlans configured on Cisco 4506, two of them with dhcp enabled to serve living area inside our company and wireless. I installed a new DHCP on windows server 2008 r2 and planning to ...
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1answer
28 views

Ubuntu DHCP Server not assigning itself an address

I am setting up a virtual environment inside an ESXi server. I have a version of Ubuntu Server running isc dhcp. When the server boots up I issue the command ifdown eth0 followed by the ifup eth0. ...
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4answers
84 views

Misunderstanding of DHCP/DNS - What is the IP of a machine before DHCPOFFER/DHCPREQUEST

From what little I understand, DHCP allows for dynamic assignment of IP addresses to client machines on a network from a DHCP server. The client transmits a DHCPDISCOVER packet, followed by a ...
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0answers
30 views

Using Microsoft DHCP with Linux PXE/TFTP/kickstart

I have a microsoft dhcp server already in the network and i have linux servers for pxe/tftp/kickstart. I would think that it would work using a ms dchp server with pxe/tftp on linux but im not sure, ...
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138 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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1answer
56 views

DHCP Server Not Registering PTR Records

I've got a DHCP server that's configured to "Always dynamically update DNS records". Unfortunately, it's not doing its job. The client sends an Option 81 with its FQDN and all flags at 0. The ACK back ...
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1answer
49 views

Linux Server Update Windows Server DNS (DHCP Not Windows)

I have Linux machines that are DHCP clients that have send hostname enabled but are not updating DNS on the Windows servers. DHCP is coming from the firewall, NOT Windows. Other windows machines ...
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1answer
56 views

Internet bandwidth split with HP1810-8G, using “DSCP QoS policies” and VLANs

I have the following scenario: We are a small company (~10 clients) with little resources and we rented out office space to another company(<5 clients). We ordered a 20 Mbit fiber connection which ...
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1answer
47 views

DHCP with fixed IP hosts (Ubuntu)

I'm managing an office system that assigns IPs based on the MAC address. The fixed hosts are added in a dhcpd-hosts.conf file which is included in dhcpd.conf. There are some PCs that are not in the ...
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2answers
87 views

DHCP server on subinterfaces

I have created two subinterfaces on eth0 : eth0:0 with IP 192.168.10.1/24 eth0:1 with IP 192.168.11.1/24 Configured /etc/dhcp/dhcpd.conf like that: option domain-name-server 194.204.159.1; ...
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1answer
78 views

lan to wan connection refused by windows firewall

I have plenty of experience with LAN's and bridges however this is my first time using a WAN style setup... here is a diagram of my network WAN (public ip & 10.1.10.1)---COMP1 (10.1.10.2) ...
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27 views

DHCP Config for Server 2012 R2

This question may have been covered before, but it is rather complex and haven't found a similar post, so please be kind! I think my issue is rather unique, so I'll try to explain as best I can. I'm ...
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0answers
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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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3answers
42 views

Can the firewall prevent the DHCP to give an address, how to fix this?

I am not getting an IP in the subnet 10.0.0.0/24 where the DHCP is working and should serve an IP, I am getting instead only an IP in the subnet 169.254.0.0/16(link local address) that is probably ...