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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How to reach a private IP (DHCP enabled) from a public facing IP through NAT?

Lets say we have computers C1 and C2 C2 has two network interfaces C2.eth0(public facing) and C2.eth1 local second physical network (addr:10.10.70.101 and Nw:10.10.70.0) Now, there are multiple ...
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1answer
111 views

Adding 4th scope to DHCP and make a superscope in windows 2012

Hope someone can shed some light here. I have a little network drama which I'm trying to get resolve as soon as possible. To give you a little background; We have CISCO SG300 small business switches ...
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0answers
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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1answer
499 views

Multihomed windows server 2012 r2 connectivity fails

I have a Windows Server 2012 r2 with 2 NICs. 1 local(169.254.1.1/24) and 1 "public"(conected to another local network, 10.0.10.47) interfaces. I have configured DNS, DHCP ONLY on the local interface, ...
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1answer
70 views

Split and Reserve DHCP Scope with Same Subnet

For simplicity sake, let's assume I'm trying to split my DHCP scope into two halves. On one of the halves I want to use MAC address filtering. I'm essentially trying to get a certain type of device ...
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2answers
654 views

VMware - VM not getting DHCP address after reboot

We are having a strange behaviour in our ESX-cluster: The Infrastructure: we have 2 ESXi 5.5.0 build 2718055 in a cluster, managed by vCenter. We are using an Essentials licence, so we do not have ...
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0answers
103 views

Windows 7 can't join in Linux domain

I installed a Windows 7 in VirtualBox and a CentOS 7 x64 too. My DHCP config is : subnet 192.168.72.0 netmask 255.255.255.0 { option routers 192.168.72.1; option subnet-mask 255.255.255.0; option ...
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2answers
809 views

Do I need a managed switch for my home network? [closed]

The benefit to home routers is that all you need to do is plug them in, and they pretty much work out of the box, allowing multiple computers to use a single internet connection. Let's say I wanted ...
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1answer
259 views

Nova network DHCP not releasing ip with force_dhcp_release=True

The problem I am seeing is that when nova-network calls dhcprelease upon instance termination (due to forcedhcp_release=True) the address is not always released(syslog are not showing DHCPRELEASE ...
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1answer
245 views

How to change broadcast-flag in Windows or Linux?

As we know there are 4 types of packets involved when a client wants to get an IPv4 address from DHCP Server. These can be seen in the image bellow (from Microsoft web site). From the perspective of ...
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1answer
185 views

Configuring Sonic wall tz 500 LAN interface with a internal dns and dhcp [closed]

I trying to configuring a sonicwall tz500. I have a internal AD server with DHCP and DNS for the domain. 10.0.0.5 is the address of dhcp and DNS. question is on the LAN 0X interface, do I assign it a ...
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1answer
366 views

dhcp not assigning gateway

So I am running a dev server for KVM virtual machines. I have a DHCP server running locally on the host node with the following configuration: /etc/dhcp/dhcpd.conf ddns-update-style none; default-...
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0answers
84 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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1answer
143 views

Linux DHCP for multiple subnet

vlan10---->firewall----->linux dhcp server vlan20---------↑ I have two vlan(vlan10 and vlan20), and I would like to use Linux DHCP server to centralize IP address designation. In fortigate firewall ...
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3answers
246 views

Intel AMT and host get different IP addresses via DHCP. How to fix?

I have a server that's recently been crashing occasionally in odd ways, so I decided to configure up Intel AMT on it in the hope of being able to reset it remotely when this happens. For better or ...
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1answer
113 views

All DNS entries are set to static

I have a WS2008 R2 server acting as DC, DHCP and DNS server. DHCP is set to always dinamically update DNS-A and PTR records on behalf of clients, DHCP name protection is enabled and DHCP credentials ...
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1answer
51 views

Why would a DNS server issue affect only one corner of a building?

I got a complaint today from an end user whose internet was extremely slow only inside his office. Every other location in the building was fine, and the signal strength was very high even inside the ...
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1answer
40 views

Ubuntu ramdisk template

I've been working on a ramdisk template for running a complete root filesystem on the RAM of a baremetal server(over IPMI so no physical access) that boots over PXE. I used debootstrap to create an ...
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0answers
66 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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1answer
126 views

Microsoft DHCP server giving “old” lease to clients switching networks

I have 2 Windows Server 2012 R2 DHCP servers running in active/active load-balancing on one of the networks. DHCP requests from the other networks are DHCP relayed by the router to these DHCP servers. ...
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1answer
278 views

Ubuntu Server 15.04 as Router and DHCP Server with multiple subnets

at my company i got assigned to build a new network, where 1 ubuntu server manages DHCP for 3 subnets, allows communication of these subnets between each other and shares the connection to the public ...
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381 views

no default gateway on interface that is set up with DHCP on CentOS7

I am using CentOS7 with multiple interfaces (ens161, ens192, ens224, ens256). The box has all static IP's with the exception of one interface that is set up to DHCP (ens192). ens192 is set up as ...
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1answer
76 views

Bridged VirtualBox VM with individual IP

On Debian hosts I run VirtualBox VM mainly to run WinX software. Some of these VM shall join AD and as such need fixed IP and shall be reachable from the LAN, i.e. NAT is no option. I considered ...
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1answer
246 views

How to receive email notification of non-AD joined DHCP leases?

This answer to theCleaner's question helped me some Windows DHCP Server - get notification when a non-AD joined device gets an IP address but the answer to his question involved Quest Poweshell ...
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1answer
142 views

Access to local dhcp server via ssh [closed]

I constructed dhcp server on centOS6 (which has a ipaddress 192.168.0.0) to allocate ip address, 192.168.0.5, to other local node. When i use "service network restart" on client node and type ...
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1answer
160 views

Windows Server 2012 r2 standard with dual NIC + DHCP

Currently I have a physical host with Windows Server 2012 r2 standard installed and DHCP role enabled. In addition the physical host has two network interface cards. I am planing to connect the ...
2
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1answer
79 views

Configuring DHCP server (Win 2012)

I am trying to do some basic testing of a DHCP server (Windows Server 2012). I'm trying to do all this testing from a laptop. The VM's are set Host-Only (or 'Private to my Mac' setting) To get ...
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1answer
481 views

TFTP boot file download aborted during PXE boot up

I'm using OpenDHCPServer together with OpenTFTPServer in order to try out network booting. My problem is after acquiring IP address client starts downloading the boot file and halts. Message in TFTP ...
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0answers
32 views

“Add Server” in MMC not showing fqdn. Any ideas?

and Nothing is "broken" but my curiosity (and sadly O.C.D) has my wondering why when I add another server through MMC it doesn't show the fqdn of the "added" server, just the hostname. Tutorials ...
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0answers
491 views

dhclient: No broadcast interfaces found, but eth0 is up and broadcast

I'm experiencing a common problem with dhclient. But I wasn't able to find a clear solution to this problem. System: ReadyNas RN104 Stock Debian for armhf Just upgraded to Debian Jessie (now ...
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1answer
55 views

Why are DHCP request and acknowledgment messages broadcasted and not unicasted?

In 'Request' part of the DORA process, IP and MAC address of the DHCP server is known to the client (as the IP datagram sent in Offer has this information). So if the destination is known, why is the ...
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105 views

Ubuntu MAAS: PXE only booting two nodes at a time

I'm currently setting up an Ubuntu (15.04) MAAS (1.7) cluster for the first time. It seemed quite straight forward and I even figured out how to boot VMs running on vSphere, so I have a nice testing ...
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3answers
696 views

How would a PCAP filter look like to capture all DHCP related traffic?

As I understand it, for IPv4 I would need to capture UDP port 67 and 68, ARP, ICMP echo request and reply, and for IPv6 I would need UDP port 546 and 547, all DHCP-related multicast addresses, ...
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1answer
132 views

Why is my DHCP pool not working?

I'm trying to create a configuration and it's doing most of what I want it to do, but the DHCP pool isn't assigning addresses. Here's the config so far: enable config t hostname xxxxxx enable ...
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2answers
157 views

Using the VLAN of a bridged switch

In our building, we have 2, 6509 core switches, one for our company, and one for another. We have a vlan configured with a /30 which bridges the 2 switches. Both of us are on separate /16 networks. ...
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1answer
483 views

Event ID 1340 - DNS registration for DHCPv4 Client & DHCID has been denied (DHCP Name Protection)

Event ID 1340 warnings are consistently being logged on a Server 2012 R2 domain controller in the System log whenever Apple/Mac clients connect to the network. Here's a log example: Log Name: ...
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1answer
38 views

request ip from dhcp

I'm automating a deployment on a vmware esxi host using some custom shell scripts and I would need to know in advance the IP this VM is going to get from a DHCP prior to it being installed. I know ...
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1k views

What happens when “Auto state switchover interval” is less than “Maximum client lead time” in DHCP?

I was wondering what happens when "Auto state switchover interval" is less than "Maximum client lead time" in DHCP? The question was raised after reading definitions of MCLT & ASSI: Maximum ...
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1answer
72 views

Linux DHCP server to provide unique options to each DHCP request

I am running a DHCP server in CentOS 6.5 and in my network, 3 clients can issue an DHCP request. The host needs to send the address of the tftp server and also the name of a config file. The order in ...
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1answer
76 views

Is it possible to set a dhcp option 77 value in vsphere as a config parameter so vNIC ROM (e1000/vmxnet3) uses it during PXE?

I'd like to set a dhcp option 77 string value in vsphere as a config parameter on a vm or vm template so that the vNIC ROM (e1000/vmxnet3) uses it during the DHCP part of PXE. My goal is to have PXE ...
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1answer
218 views

Symmetric DHCP failover configuration

I have set up a DHCP server on CentOS 7. It runs beautifully, however due to business demands, we are expanding to another site far away. This gives us the opportunity to host a failover DHCP server ...
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1answer
113 views

is it possible to use cobbler using windows dhcp server or without dhcp?

I want to configure cobbler in my network but my network already managing by a windows 2k8r2 dhcp server. Is it any way to configure without dhcp server ?
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1answer
369 views

Setting up stateful DHCPv6 on Linux

I want to set up a DHCP server on my local network for IPv6 that issues addresses and further information like DNS/NTP and so on. From my ISP I got the IPv6 Prefix which I will refer to as in further ...
3
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2answers
2k views

WiFi access point without internet access - iOS devices disconnect

I'm trying to configure a WiFi access point to offer a web service on the local network, without offering clients internet access. The web server has a fixed IP address (let's say 192.168.2.2) and for ...
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1answer
156 views

No internet access for client static ip on linux dhcp server

We are using a dhcp server configured with isc-dhcp-server on debian 8 in a small office network. The server has two network adapters one is connected to a pppoe modem and the other is connected to ...
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122 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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91 views

Why Windows not get DHCP properly?

I have a VM that installs Windows Server 2008 R2 Enterprise. It configures both DHCPv4 and DHCPv6 clients. The VM locates on an isolated network, where a dnsmasq offers both DHCPv4 and DHCPv6 servers....
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1answer
323 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 - x.x.x....
3
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2answers
737 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
357 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 ...