Questions tagged [dhcp-server]
Dynamic Host Configuration Protocol (DHCP)
541
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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 ...
- 21
2
votes
1
answer
371
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Is it possible to bring down a network with DHCP discover?
When a DHCP server receives a DHCP discover message it broadcasts the offer across the entire network. If a malicious machine joined a network and somehow began spamming DHCP discover messages, would ...
- 135
2
votes
1
answer
122
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Are MAC ID passed via DHCP Relay
Do MAC ID pass through dhcp relay? Even if its connected on the WAN from the internet?
So if the DHCP Server is on the WAN of the router and connected to a DHCP server on the internet is it passed?
- 181
2
votes
2
answers
7k
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Windows Server set multiple Gateways and metrics
I would like to configure my DHCP Server (Windows Server 2008 R2) so that it assigns to each host two gateways. The client should use the gateway which is closer (less number of hops). I can do this ...
- 177
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1
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Can Windows Server 2003 DHCP Server assign multiple IP Addresses to a single host?
I have Windows 2003 Server handling DHCP for our network. We use reservations to assign some hosts IP addresses. Is it possible for the server to assign a single host two IP addresses in different ...
- 213
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2
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Static lease IP dhcp within dynamic range pool
I am using fedora 13.
I want to statically bind a MAC to IP. Now the problem is if the IP is within the range pool, it may get allocated to some other host also. For that I use a tweak, where I ...
- 129
2
votes
2
answers
372
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DHCP/static IP nomenclature
I've just inherited systems administration for a small network, on which we have exclusive access to the first 128 IPs on a private virtual subnet. We have a DHCP server which binds IP addresses to ...
- 471
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1
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When does ISC dhcpd expire leases
When exactly does ISC dhcpd forget a lease that is not explicitly freed by the client?
Context: I am running an installation with many small pools (3 address) and it does not seem to cope well when ...
- 3,999
2
votes
1
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132
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Computers using ::1 for DNS server on DHCP ipv6
When ever i look at ipconfig /all i see that my computers are getting ::1 for the first DNS server from my dhcp server. I have removed this entry from the list of DNS server in the options, but the ...
- 231
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votes
2
answers
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Active Directory and VPN on single server setup
I've attempted this several times now and never got it exactly correct. I am looking to setup my ML5 server as a VPN Server, Domain server, DHCP Server and file server. However every time i have ...
- 187
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votes
1
answer
137
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DHCP Server that will hand out tiny leases?
I am attempting to reproduce a condition in a lab and am hopeful to find a DHCP Server in which I can configure it to hand out tiny leases (20 seconds). So far, all I can find will not hand out leases ...
- 651
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1
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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 ...
- 649
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1
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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 ...
- 155
2
votes
1
answer
13k
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configure a dhcp server to serve two different scope on the same subnet with multiple interfaces
Ok, so here I am with a pretty complicated problem on a Debian Wheezy server
I have three interfaces : eth0, eth1 and wlan0 on a single server, eth0 will act as a gateway for eth1 and wlan0, I have a ...
- 121
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1
answer
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How to find out IP address held by a Windows DHCP client yesterday?
We have a Windows Server 2008 with DHCP server running.
I can see the current leases and reservations, is there a way to see the status of yesterday (or at least what IP a particular client had ...
- 1,868
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is it possible to run bootp/pxe server using dnsmasq without act as dhcp server
on my network its already exist a router that do dhcp, boot in this network i need to boot a diskless system that use pxe to boot from network, while the pxe server is using dnsmasq to serve O/S, but ...
- 255
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Removing DHCP role, cleaning up AD data
Back story.
So we had a development engineer (who just happened to have access to a domain admin account) who set up a handful of DHCP servers on our domain. This caused headaches, as the new DHCP ...
- 880
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2
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deny unknown-clients dhcpd.conf
I'm having troubles figuring out how to set up my dhcpd.conf. I am rather new to this.
I want to allow booting and only allow the clients listed below to get their fixed address.
I do not know how to ...
- 123
2
votes
2
answers
5k
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What's the difference between REBOUND and RENEW state on DHCP Client?
According to various DHCP description after reaching 50% client will enter RENEW state and will start sending DHCPREQUEST messages to the server in order to renew the lease. It will continue to send ...
- 834
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4
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4k
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Monitoring an ISC DHCP Failover Status Using Nagios
I recently implemented ISC DHCP Failover and it's working beautifully, but I'd like to monitor the current status of the failover using Nagios.
Ultimately, I would like my Nagios check to:
report ...
user81598
2
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1
answer
3k
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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 [...
- 21
2
votes
1
answer
981
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Have a script receive an IP from the DHCP server?
None of the Nagios DHCP check plugins can actually take an IP from the DHCP server as a real test. All they do is ask which IP it would give to a certain mac address.
Our DHCP server failed, where ...
- 486
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2
answers
2k
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DHCP server is saying 'host unknown' before sending DHCPOFFER
I am trying to PXE boot a machine. In the system log, I can see:
dhcpd[28030]: DHCPDISCOVER from 98:90:96:bc:fc:e3 via 10.65.240.2
dhcpd[28030]: none: host unknown.
dhcpd[28030]: DHCPOFFER on 10.65....
- 3,513
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dhcp 'next-server' outside broadcast domain, without using ip helpers(aka dhcp relay)
Can you set a 'next-server' option in dhcp that is outside of the client's broadcast domain? I'm trying to pxe-boot from a server outside my client's network, using isc-dhcpd
In my lab I see the next-...
- 155
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How can I set the Ethernet infrace classid through Powershell?
Hey guys I wonder if it's possible to set classid on Ethernet interface via Powershell? I tried that on server 2k12 R2 via ifconfig but I get no results.
- 248
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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 ...
- 196
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1
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5k
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DHCP Relay behind two router
If i have a DHCP Server above two routers and a cleint computer below and the client computer is connected to a router with DHCP Relay, will dhcp pass through those two routers?
Here is an example
...
- 181
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2
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How to setup redundant dns and dhcp servers with automatic dns updates on Ubuntu?
I'm trying to configure two virtual servers running Ubuntu to act as primary and secondary DNS and DHCP servers in my lan.
I was able to get bind9 working as master and slave DNS servers.
I was able ...
- 289
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1
answer
3k
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Multiple DHCP Server on same subnet and range assignement
Is it possible to have two DHCP Server on the same subnet for address two range of IP?
Is it possible to configure one of this DHCP server to serve only a certain range of mac address ?
for example ...
- 3,220
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1
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Identifying current main DHCP server
There are two DHCP server of the same IP address example.(10.100.9.12 and 10.100.9.13).
The gateway, subnet mask, and DNS is the same.
The current DHCP are running on Vlan9.
Is there any possible way ...
2
votes
1
answer
427
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Dns configuration in windows changes unintentionally to manual mode
We have a Domain controller (windows server 2012) in our LAN, there is also a DHCP server for clients to get them IP automatically.
all clients give right ip and dns configurations and work as well ...
- 123
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2
answers
2k
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How to fix DHCP server after main switch replacement
I am a computer science teacher in a small school who is getting to grips with a role as server/network admin. Today, we all lost internet connection and were unable to access the server remotely.
It ...
- 121
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2
answers
3k
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DHCP not sharing Internet access
I have several Virtual Machines in Vmware ESXi 6.5 with 2 Network Groups.
Created a DHCP Server Machine on CentOs with 2 networks interface.
1 / vm network from which it takes a network and has IP ...
- 23
2
votes
1
answer
3k
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ISC DHCPD class is not assigned
I'm trying to setup a boot server which only answers to devices which want to boot over the network. Depending on the boot rom, I need to deliver different boot images, the other settings are common.
...
- 545
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1
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2k
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Windows Server 2012 DHCP and OSX Devices
I've recently put together a small office network (around 20 devices) with an attached machine running Windows Server 2012. Our gateway router provided by our ISP was pretty useless and started ...
- 21
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3
answers
2k
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DHCPD assigning wrong DNS server
I just installed two Ubuntu 14.04LTS servers. The first one I installed bind9 and isc-dhcp-server on. The second one was left as installed to use DHCP. I created a new private network using VMware ...
- 1,505
2
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1
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591
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Use Windows Server 2012 R2 IPAM Role to Manage a DHCP Cluster
My Google-fu is failing me today. I would like to blame the bad office coffee, the fact that it is a Monday, and the lack of information online...but maybe it is my fault. Either way, I hope that you ...
- 3,469
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1
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Changing DHCPv6 server
I have a DHCPv6 daemon that is answering for requests of some machines and everything is working fine. So I decided to remove this DHCPv6 daemon e start another daemon on another server, but the ...
- 335
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2
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91
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Why is a computer on my network not resolving correctly?
I am running Windows 2003 Server with Active Directory and DHCP enabled.
the machine: laptop1 receives the IP: 10.2.6.134 from the Windows 2003 DHCP Server.
the machine name and IP does not show up ...
2
votes
1
answer
6k
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DDNS Not Creating Journal (Dhcpd and Named)
* EDIT 1 *
After monkeying with additional debug logging I see some log entries of interest.
27-Jul-2012 23:45:26.537 general: error: zone example.lan/IN/internal: journal rollforward failed: no more
...
- 21
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2
answers
316
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DNS for locally defined domians not working in regular intervals
I have been having a strange problem with our locally hosted DNS (bind on ubuntu server). We have a DNS server that hosts several locally defined domains (for example, myserver.localnetwork). ...
- 251
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2
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Recommended dhcpd Web Interfaces?
Can anyone recommend a solid dhcpd web interface? Google searches turn up all kinds of results, including projects that haven't been updated since 2002. I'm looking for something that is a little more ...
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FreeBSD DHCP server on multiple interfaces
I have FreeBSD server (7.2) which has a lot of interfaces (vlans, count near 100). I want to configure DHCP server with separate pools for each interface. What program should I use? Thanks for any ...
- 194
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0
answers
995
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Clear routes from DHCP option 121
I have 3 subnets
192.168.10.0/24
192.168.103.0/24
192.168.2.0/24
Most of them can route to each other via static routes defined in their respective default gateways.
However due to some ...
- 36
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1
answer
3k
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UEFI Enabled; unable to get IP address from DHCP, WDS
I'm trying to boot PCs from a Windows 2012R2 WDS server in UEFI mode. it works fine BIOS mode, but I want to boot from UEFI mode.
I have change the boot setting to UEFI mode; secure boot in BIOS.
I ...
- 1,142
2
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0
answers
651
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Weird answer of linux DHCP server to gratitious ARP causes DHCP failure
This is a problem, that I ran into recently on a quite heavily configured linux server. This machine runs Samba as an Active Directory Domain Controller, a mail server, a web server, two virtual ...
- 438
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votes
0
answers
869
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DNS issue when communicating with Windows Server 2012 R2
I have upgraded my Windows Server 2008 R2 to a new Windows Server 2012 R2 and installed AD DS, but when to trying to join other PCs to the domain it gives the following error:
The specified domain ...
- 23
2
votes
0
answers
167
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ISC DHCP (Infoblox) takes 30+ seconds to respond to DISCOVERS
Client's DISCOVER packets reach the Infoblox DHCP server through DHCP relays, but Infoblox doesn't seem to be responding.
I checked the pcap taken from the DHCP server, I can see there is 3 DISCOVERS ...
- 129
2
votes
1
answer
1k
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DHCP server is not selecting IPs inside of the specified range
I have my DHCP server which I specificaly set the ip range to be between: 10.53.70.100 -- 10.53.70.200 but there are sometimes I get IPs outside from this range. For example, the last server I created ...
- 231
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1
answer
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pxe and dhcp on dfferent subnets
Good Day
Please help , i have a dhcp on 192.168.21.0/24 and pxe server on 192.168.1.0/24. Now i want to install hosts in 192.168.21.0/24 using this pxe tftp netboot on 192.168.1.0/24. My hosts in ...
