Questions tagged [dhcp-server]
Dynamic Host Configuration Protocol (DHCP)
542
questions
1
vote
1
answer
3k
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-...
1
vote
1
answer
2k
views
CentOS DHCP server gives DHCPNAK upon DHCPREQUEST from client
I'm trying to setup a DHCP server on a virtualized host only network and I'm having some issues. Currently I'm only running two VMs one being the server and the other being the client both VMs are ...
1
vote
1
answer
3k
views
Why are DHCP leases not included in DHCP Log?
Running Windows Server 2008r2. DHCP Logging is enabled (Server Manager, Roles, DHCP Server, , IPv4, Properties, General, Enable DHCP Audit Logging).
In the DHCP event log (Event Viewer, Custom Views,...
1
vote
1
answer
150
views
Failover DHCP Windows 2012
Is Windows 2012 failover DHCP (hot standby) compatible with Windows 2003?
I'm not sure if it's enough to create a Windows 2012 DHCP server and configure failover options.
1
vote
1
answer
243
views
Server 2003 DHCP Server with Low-Access user account
I'm trying to run the DHCP Server service under a low-permissions account (partly to reduce attack-vectors, and partly just for kicks), as it runs under LOCAL SYSTEM by default.
I've successfully ...
1
vote
2
answers
12k
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 ...
1
vote
1
answer
12k
views
Setting up routing in CentOS 6.4 as a router/DHCP server with two nics
I am stumped about how to setup centOS 6.4 to route packets.
|Local Network| -eth0- |CentOS 6.4 box| -eth1- |Internet|
The centOS box has a dhcp server running. Currently it is handing out IP ...
1
vote
1
answer
1k
views
How to override the network DHCP Server settings to be specific to my own .conf file?
Basically, I have want to test out WPAD(Web Proxy Autodiscovery Protocol ) , PAC. But I would like to do it without touching the Network DHCP server. So, can you suggest a way in which I can achieve ...
1
vote
1
answer
7k
views
What is the ip-forwarding option in dhcpd.conf?
From O'Reilly's book "TCP/IP Network Administration":
option ip-forwarding 0 | 1;
Specifies if the client should do IP forwarding. 0 disables IP forwarding, and 1 enables it.
The only IP ...
1
vote
1
answer
713
views
Guest Internet access for an hotel
First of all, thanks so much for all the help from all the techies on this site.
We have to implement the ability for guests to use the internet over wireless for an hotel.
When guests check into ...
1
vote
2
answers
3k
views
Why is DNS updating every hour on the hour?
I have a Server with a statically set IP address of 10.200.0.30
It has a Dynamic DNS entry matching its computer name to its IP
Every hour on the hour it changes its DNS entry to a random IP address ...
1
vote
4
answers
4k
views
problem dhcp3-server ubuntu server 11.04
I installed dhcp3-server in ubuntu server 11.04
apt-get install dhcp3-server
However, an error message during installation:
Traitement des actions différées (« triggers ») pour « man-db »...
...
1
vote
1
answer
3k
views
Can't find dhcp configuration file
I've installed dhcp server on my ubuntu natty (11.04) by typing this:
sudo apt-get install dhcp3-server
but, I can't locate the dhcp configuration file (dhcpd.conf) in /etc/dhcp3/ or in /etc/dhcp/
...
1
vote
1
answer
1k
views
Moving from ISC DHCPd to Windows Server 2008 R2 DHCP
I currently have a Linux server running ISC DHCPd and I'd like to eliminate this server and move to a Windows DHCP server. I'm wondering if there is an easy way to accomplish this or if someone could ...
1
vote
2
answers
305
views
how to Centrally manage multiple IP's for machines single Nics
We are a web dev shop and all use laptops and at the moment use static IP's. Each machine has one NIC but we need multiple IP's to deal with the multiple IIS Sites we have. The more machines / users ...
1
vote
1
answer
71
views
Using dhcpd hosting web site fedora?
how do we host a web site for small group located across country on dhcpd ipaddress, we have fedora install server with httpd config on right now we can use that web site only on same network. If we ...
1
vote
2
answers
601
views
Devices keep getting IP from previous VLAN
Some devices (printers and laptops) that are moved to another building with a different VLAN will not release the IP address assigned. I noticed this first when a laptop reported no network ...
1
vote
1
answer
222
views
DHCP failover with PXE
I'm trying to set up DHCP failover with PXE booting allowed from one of the DHCP servers. As required by the DHCP specification, I've setup separate pools for "regular" DHCP and for PXE ...
1
vote
1
answer
4k
views
DHCP NTP Server Option 042 not propagated by Windows Server 2016
I am trying to make NTP server settings available to our non-Microsoft devices on local wired and wireless network. Obviously, they don't know how to use MS AD time info from domain controller.
Our ...
1
vote
1
answer
1k
views
Process to migrate DNS and DHCP from on-premise, Windows domain controller
Our organization has an on-premise, Windows, domain controller that we'd like eliminate in favor of a local DHCP/DNS server on either our Unify switch (first choice) or FortiGate VPN appliance (second ...
1
vote
1
answer
1k
views
Why do we need both DHCPOFFER and DHCPREQUEST?
In DHCP DORA process, the server offers a client an IP address with DHCPOFFER message. Why does the client have to send an explicit DHCPREQUEST message again to the server? Why not send a DHCPACCEPT ...
1
vote
1
answer
2k
views
DNSMASQ Not recieving DHCP requests/ DNSMASQ Not sending
I have a Fedroa 31 BOX that I'm trying to use as a dhcp server. It doesnt appear to be functioning. I have used dhcping 192.168.1.xxx where xxx is ip address of server and the output is always no ...
1
vote
1
answer
1k
views
How to configure OpenVPN to update Bind9 entries for local domain?
I have found an article describing how to configure dhcp3 server to update a Bind9 zone with the hostnames and assigned ip addresses.
I want to achieve the same effect, but inside a VPN subnet, where ...
1
vote
1
answer
6k
views
Windows Server 2016 Dhcp failover configuration
I've built a new AD domain and I've got 2 dhcp servers (2016 & 2019) that have been setup in a Failover partnership. I've tested it and it's working correctly. I decided to RENAME both of these ...
1
vote
1
answer
3k
views
DNS server information not provided to DHCP clients by dnsmasq
I am trying to utilize a Raspberry Pi with Raspbian Stretch (Linux) so provide additional network monitoring and also routing capabilities. To this end I have the following setup:
Internet router [...
1
vote
1
answer
212
views
Isc Dhcp-allow only 1 lease from opt82 tag
I'm implementing an isc dhcp server that will be utilizing option 82 tags from our switches to hand out dhcp information/addresses I'd like to deny multiple requests with the same tag (if someone ...
1
vote
1
answer
1k
views
Why would ISC dhcpd ignore vendor options?
I'm trying to use an existing dhcpd to autoconfigure Raritan networked PDUs. This works roughly like PXE booting: there are additional DHCP options that direct the device to fetch a config file via ...
1
vote
1
answer
10k
views
How to reserve a static-ip on Mikrotik router for a device that is attached to a fixed router's Ethernet port
I am trying hard to figure out how can I force any DHCP client device connects to the port ETH10 on Mikrotik router get assigned a fixed IP-address.
Please note that the device MAC address is unknown ...
1
vote
1
answer
1k
views
Is it possible to declare two ethernet interfaces for the same host in dhcpd.conf?
Ubuntu Server 16.04 with isc-dhcp-server.
Within the /etc/dhcp/dhcpd.conf configuration I have stated a reserved address for a host provisioned with dhcp this way:
host laptop {
hardware ...
1
vote
1
answer
2k
views
dhcpd option 82 logging not working
We are implementing Option 82 in our network and I am just scratching the surface of how to setup my server. I have successfully created my first Option 82 ACL based on the agent circuit ID that is ...
1
vote
2
answers
2k
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 ...
1
vote
3
answers
1k
views
Setup DNS on Windows Server 2012 with DHCP running router connected to it
I have a Cisco router connected to a server running a fresh installation of Windows Server 2012.
What should I do to configure DNS on the server if I leave the DHCP enabled on the Cisco router?
1
vote
1
answer
4k
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: ...
1
vote
1
answer
9k
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 ...
1
vote
1
answer
641
views
Obtaining the running config for dhcpd
Is it possible to obtain the current running config for dhcpd? I inadvertently wiped dhcpd.conf but have not yet restarted the service. It is currently assigning the correct IPs to my test ...
1
vote
1
answer
3k
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 ...
1
vote
1
answer
853
views
Multiple DNS mappings for a host via DDNS
I have a network in which DNS is automatically updated with a record for hosts when they get an address via DHCP (isc-dhcp-server & Bind configured with DDNS updates). The DHCP server is ...
1
vote
1
answer
627
views
DHCP server not assigning IPs - Linux (CentOS)
I am having a main issue with the DHCP server. It is not assigning IPs and the dhcp.leases file is increasing in size as it is logging multiple entries for same IP. Started and stopped the service ...
1
vote
1
answer
1k
views
HyperV Migration and DHCP Reservation
In my company network we've 2 HyperV-2012 host with DAS, every server has a DHCP reservation in the DHCP server (windows server 2008).
Yesterday we've migrated (using shared with nothing migration) ...
1
vote
2
answers
4k
views
DHCPD on FreeNAS?
I've got a FreeNAS install I've been using for a while, and wanted to set it up to serve as a network boot server. I downloaded and installed the isc-dhcpd-server, configured the tftp+iscsi+etc ...
1
vote
1
answer
2k
views
dhcpd: varying vendor-class-identifier
I'm having trouble selectively sending parameters in response to a DHCP Inform packet using groups (or even without, just using host declarations) for bootp stuff. My configuration file right now ...
1
vote
1
answer
453
views
Parsing the results returned via DHCPd's OMAPI interface
I'm experimenting with OMAPI as a means of giving our support staff additional insight into the state of a subscriber's service. Anyone who's ever played with OMAPI knows two things:
The ...
1
vote
1
answer
2k
views
Microsoft DHCP Known and Unknown Clients
With ISC DHCPd under Linux, I can define separate pools for "known" and "unknown" clients, like this:
subnet 10.0.0.0 netmask 255.255.255.0 {
option routers 10.0.0.254;
# Unknown clients get this ...
1
vote
2
answers
2k
views
DHCP log only visible from some programs
We recently changed the DHCP service at my workplace from a RHEL server to a Windows 2008 R2 server. As I'm used to monitoring the logfiles with "tail -f" I thought I'd try to read the logs on the new ...
1
vote
1
answer
2k
views
dhcpd: How to tell how many leases are available?
I'm a little bit new to dhcpd. I'm trying to figure out how many leases we have available on our network.
The /var/lib/dhcpd/dhcpd.leases file appears to show almost a history of leases and some of ...
1
vote
0
answers
276
views
Different gateway for a single host in DHCP server
I am using ISC DHCP Server and I want to assign a different default gateway for one of the devices using that DHCP.
I have the network 192.168.0.0/24, and two redundant ISC DHCP servers assign IP ...
1
vote
0
answers
511
views
deploying pfSense in OVH public cloud as a DHCP server in HA
I am trying to deploy two pfSense in the OVH public cloud (OpenStack).
Each has its own public IPs and public connectivity works without any problem.
Things become more complicated on the vRack part (...
1
vote
1
answer
408
views
DHCP server does not provide correct filename for PXE
I'm trying to configure PXE server for both Legacy/UEFI support. So I need to provide different bootloaders based on architecture of machine.
Here's part of dhcpd.conf:
option architecture-type code ...
1
vote
1
answer
347
views
How to send custom DHCP option on all Offer and Ack packets in kea?
I'm using the Kea dhcp server, and I want to use the DHCP options to send data to the server's clients. Following the instructions here, I listed the option with the "always-send": true ...
1
vote
0
answers
128
views
libvirt and dnsmasq does not allow to start Kea DHCP server
I have libvirt installed which instantiates dnsmasq process per each virtual bridge interface, e.g. virbr0, however for some reason I can't start kea-dhcp server on other interfaces in the system, ...