Dynamic Host Configuration Protocol (DHCP)

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How to connect docker containers to physical local network?

I have a automation script which runs clusters docker containers which are need to be in my local network. Right now i am manually collecting list of un-used IP address in an array and i am poping out ...
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CentOS: DHCP Server and DHCP relay on same machine

eth0 IP: 192.168.1.100 Alias interface eth0:dhcp IP: 10.10.1.100 dhcpd.conf: authoritative; local-address 10.10.1.100; subnet 10.10.1.0 netmask 255.255.255.0 { range 10.10.1.10 10.10.1.50; ...
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49 views

DHCP server not found during PXE boot

I'm trying to run a PXE server and encountering the “PXE-E51: No DHCP or proxyDHCP offers were received” error, which usually means that: the PXE client did not receive a reply to its DHCPDISCOVER ...
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2answers
23 views

forward eth0 traffic over tun0

I'm trying to setup a raspberry pi 3 as a vpn access point(?) So far I have wlan0 configured to connect to a mobile hotspot, when this is connected openvpn connects to the vpn server. This works fine,...
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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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Windows 2008 DHCP service fails - “…failed to see a directory server for authorization.”

I have a small environment running Windows 2008 R2 where the DHCP service on the domain controller fails every two weeks. The most-visible error is Event ID 1059 and the Event Viewer message is: "...
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253 views

Enable DHCPv6 in dnsmasq to distribute fixed range IPv6 addresses but failed

Help wanted! I want to create a AP in my Raspbian PI. And i choose dnsmasq as the dhcpv4 and dhcpv6 server. However, my laptop can acquire IPv4 successfully but fail to get a IPv6. Why the dnsmasq ...
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3answers
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Fixed dhcp host to automatically expire any lease

I have the following situation: Multiple offices with multiple firewall/dhcp servers. Every time the IT team of some office plugs a new network printer i need to create a fixed-address entry, and ...
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1answer
66 views

How to get the OS information of all systems connected to a network? [closed]

Suppose there are some Windows systems and some Linux based systems and may be some Android netbooks are connected to a LAN through Ethernet. Using arp -a(from DHCP server) I was able to find out IP ...
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25 views

Sonicwall firewall router dhcp server stops working intermittently

I just bought a Sonicwall SOHO which is the new model that replace TZ105, TZ 205 series. The network stops working intermittently. The whole network is down after every 30~70 minutes of uptime, no ...
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Use Windows RSAT DHCP Server MMC SnapIn with Linux Samba 4 AD to manage dnsmasq/isc-dhcpd

This particular Active Directory installation uses a Samba 4 Domain Controller Forest running on up2date (05-2016) Debian Linux Jessie VMs. Remote Server Administration Tools (RSAT) are used from ...
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1answer
73 views

Few Concern: Migration domain controller 2008 R2 to 2012 R2 Domain

My Topic is Migration of 2008 R2 domain controller to 2012 R2 (All domain Controllers.) Current Set-up. I have 3 Domain Controller. DC2008r201: Running As PDC and DNS Installed. DC2008r201. ...
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52 views

dhcpd class match on hostname or mac address

We are running DHCPD 4.1.1-P1 on a RHEL 6 server. Currently we have 1 class defined for deny purposes. We now have a need for a class match to allow all devices that match a variable and deny ...
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16 views

Smaller subnet mask to “merge” VPN-connected LANs?

I have two LANs connected to different internet connections (in different cities, in fact): ISP1 -> LAN 1: 192.168.10.0/24 ISP2 -> LAN 2: 192.168.11.0/24 On each LAN is a router. Both routers ...
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74 views

Why does a DHCP4 client not respond to the DHCP Offer from a DHCP server?

An extremely simple DHCP server works reliably with Windows 10 PCs and Android devices. It receives DHCP Discover from a client, replies with DHCP Offer, then receives DHCP Request from a client. ...
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41 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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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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1answer
32 views

Wireless devices are detecting DHCP/DNS but Wired are not

I set up a server hosting AD, DNS, and DHCP. My wireless devices are successfully contacting the server and receiving an IP address, but my wired devices are not connecting. I have 2 virtual servers ...
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61 views

windows server 2008 R2 DC/ Dhcp server

windows server 2008 R2 DC/ Dhcp server. my workstations (windows 10 and windows 7) are having problems with connection. they are getting limited connection. the err they are getting on the work ...
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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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DHCP Server Dynamically Updating DNS on Other Server (Both Windows 2012 R2, No AD)

We have had a single Windows Server 2012 R2 server (with no Active Directory) running DNS and DHCP for our main network for a good few months with dynamic DNS updates from DHCP working fine. We have ...
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how dhcpd handles static IPs vs DHCP reservations

We have a RHEL 6.7 server for DHCP. I am needing some clarification on how dhcpd handles network addressing when someone wants a permanent IP address. Here is a sample config from one of our servers. ...
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Unable to access VM after DHCPACK libvirt

The installation of a particular software makes my VM lose its connectivity. The point where it hangs is 2016-04-05 16:49:11.996 | Listening on LPF/o-hm0/fa:16:3e:b2:43:4c 2016-04-05 16:49:11....
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1answer
88 views

Does a Windows host correctly interpret dnsmasq parameters?

I have a network of Windows 10 machines served (DNS and DHCP) by a dnsmasq instance on a Ubuntu server (Ubuntu 15.10, dnsmasq 2.75). The setup basically works (dnsmasq provides addresses and manages ...
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1answer
77 views

Windows Server 2012 Failover DHCP

I've been tasked with migrating from our current 50/50 scope resilient DHCP servers to new hot standby failover DHCP in Server 2012 R2. Built a test bed with the two DHCP server VMs and created a ...
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58 views

How to discard a DHCP request's old IP address (and provide a new one)?

I switched from a 192.168.0.0/24 network to 10.10.10.0/24. The addresses are provided by dnsmasq-dhcp. The switch went fine for all devices but one - a printer (called PRINTER). This printer was ...
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33 views

DHCP issue with Cumulus and ESXi

So my switch has Cumulus Linux running on it and I have ESXi running in my network. So my main network is on 172.22.0.0/24 which has my my esxi. The networks I want esxi vms to run on is 172.22.20.0/...
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3k views

DHCP Post-Install configuration wizard hangs

I'm attempting to set up a Windows 2012 Active Directory demo environment on a Hyper-V VM, but when I run the DHCP Post-Install configuration wizard to authorize the DHCP server in AD DS, the wizard ...
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2answers
77 views

Microsoft DHCP only for reserved addresses

We are runing a Windows Server 2012 DC which also takes care of DHCP. Now I want to limit the DHCP-Server to all the reserved hosts to prevent DHCP leases for foreign devices as laptops, smartphones,.....
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IPv6 Ping is unsuccessful when IP is obtained from DHCP server

I just faced this problem and it's driving me crazy. I have DHCP server for both IPv4 and IPv6. IPv4 works like a charm but the problem is IPv6. My client gets IPv6 (fc50::a9 to be exact) from DHCP ...
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dhclient bound to recorded lease even if no DHCP server is availabe

My Ubuntu machine is connected to switch and switch is connected to DHCP server(router).Now whenever DHCP server is down but link is available through switch it tries DISCOVER multiple times. But ...
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DHCP option 43 on switch Dell PowerConnect 5500

I have Dell PowerConnect 5524. Put SW01(config-dhcp)# option 43 hex f104ac1338fa got Option code 43 is not a valid HEX string. Strange. Its worked ok for me on Cisco device. Looking at User ...
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1answer
213 views

DHCP: Create a scope within a scope

Before I joined the company I am currently working for, they set up a scope to encompass the 10.2.0.0/18 range of IP addresses (10.2.0.0-10.2.63.254). I was recently tasked with adding reservations ...
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70 views

Possible to configure DHCP server to only hand out IP's to PXE clients

Is there a way when you are setting up a Red Hat DHCP server for PXE boot to ONLY hand out IPs to PXE clients? We already have a Windows DHCP server on the network (a server which we do not manage)and ...
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1answer
47 views

Does a Linux DHCP server have IP conflict prevention?

Scenario: We are migrating DHCP off our Cisco gear and onto a Red Hat 6.7 server. I am concerned about clients who will not release and renew for several days. Since the new server will not have any ...
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2answers
53 views

DHCP Reservation Without Knowing MAC

Is there any possible way to have a DHCP reservation set for a device which I do NOT know the MAC address for? In other words, is there any thing that might just be unique for a certain model of ...
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1answer
110 views

How to generate DHCP Decline scenario / packets

I have a dhcp packets sniffer, which needs to log if it sees dhcp decline response coming from client.I need to know the scenario where client can send dhcp decline response to dhcp server. I tried to ...
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134 views

Force isc-dhcpd to disregard client hostname in ddns updates

I have the following configuration of isc-dhcpd-4.3.1: ignore client-updates; ddns-update-style interim; subnet 192.168.128.0 netmask 255.255.255.0 { use-host-decl-names on; update-static-...
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Can I use isc-dhcpd to provide an IP address based upon the request parameters?

I've got a dhcp request to be served with ISC-DHCPD: Gateway-IP 10.128.1.9 Client-Ethernet-Address 00:01:23:45:67:89 Vendor-rfc1048 Extensions Magic Cookie 0x63825363 DHCP-Message ...
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1answer
1k views

DHCP Warning Sign Icon On Windows Server

I have a Windows Server 2008 R2 SP1 Domain Controller. I have the roles AD, DHCP, and DNS installed on this server. I noticed today that there was a warning sign on my IPv4 setting, but not on my IPv6 ...
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1answer
125 views

ISC DHCP Server “Dynamic and static leases present”

i have a problem similar to Fixed and dynamic IPs in ISC DHPD lead to double lease In my DHCP-Log I often receive warnings like Jan 21 10:20:56 dc2 dhcpd: Dynamic and static leases present for 192....
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1answer
52 views

How to force DHCP server to provide a new IP? [closed]

I am using DHCP option 50 (client is an embedded device running eCos RTOS) to request a specific IP from the DHCP server (DHCP server is a built-in one with Windows 2003 server). First DHCP client ...
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139 views

DHCP scope not being created or created incorrectly [closed]

I'm trying to automate the creation of DHCP scopes, but have run into a tricky pickle. When I try to create a scope via the commandline like so: netsh dhcp server add scope 10.10.15.0 255.255.254.0 "...
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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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1answer
25 views

DHCPD configuration by interfaces

I have two interfaces on a machine running Ubuntu 14.04 LTS. Which has two different interfaces namely eth0 and eth1. I need to give IP addresses to the clients by the interfaces. For example, Any ...
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1answer
218 views

dhcpd not offering reserved static IP returns unknown lease

typically when I reserve an IP for a MAC addr the device when booting up and requesting a dhcp address, will pick up the address I reserved. However recently the request looks like it comes in but ...
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1answer
20 views

How to interpret certain aspects of dhcpd logs

I have a DHCP server running on RHEL 6.6. I understand the process (somewhat) involving how the conversation goes from a protocol standpoint to set up a lease. 1 - The DHCPDISCOVER message. 2- The ...
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1answer
472 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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75 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 ...