Questions tagged [dhcp]

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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DHCPv6 isn't updating DNS

I asked this on the Debian Users mailing list, but thought I'd ask here as well. I'm using Ubuntu 16.04 on ISC DHCP 4.3.3 and BIND9 9.10.3. I'm having trouble getting my DHCPv6 server to update DNS ...
Joshua Schaeffer's user avatar
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StrongSwan: Pushing DHCP Routes (code 121) to Windows 10 clients

my Roadwarriors usually use the same network address as my company's network does (192.168.0.0/24). By default the Windows clients install a new route which routes all traffic with destination to 192....
Andreas's user avatar
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DHCP, AD all stops every day

I have a serious issue with our Active Directory network. I'll try and keep this brief and to the point. Problem:- DHCP, AD all stop working every day. Background:- 1 single server 2012 R2, running ...
Stevey G's user avatar
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Windows Server - redirect all DNS lookups to a specific address

This is using Windows Server 2016, Linux is not an option in this case. I need to set up something like a captive portal but much simpler. I have a Windows Server machine set up to advertise a WiFi ...
Charlie Skilbeck's user avatar
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Unable to mount root via NFS

I have an NFS server connected to a reconfigurable computer (with a BORPH system). I'm using minicom with "run netboot" to boot via DHCP+TFTP+NFS, and I see the following error: Sending DHCP requests ...
user418751's user avatar
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Multiple DHCP servers for two seperate domain on one vlan

I would like to setup 3 DHCP servers for two domains so one will be failover for both. I have 2 DCs (AA, AB) in domain A and 1 DC (BB) in domain B. All three DCs are on the same vlan (192.168.1.XXX). ...
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Vanishing network connectivity in HPC cluster

Hello and thanks to everyone in advance! My team and I have been plagued by the stability of a cluster that we use for scientific research. We have a lot of science and software engineering ...
Joshua Gevirtz's user avatar
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Distributed DHCP probabilities

I'm building a mesh network. All nodes have an "AP-level" router/AP [as we call it to distinguish it from the "MESH-level" router/AP] that takes care of handling client connections via a traditional ...
Nikksno's user avatar
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Name resolution and DNS registration for a CentOS 7 Azure VM

I have a Linux VM (CentOS 7.2) running on Azure, which is configured as a DHCP client because this is required by the Azure platform; Azure DHCP correctly supplies a network configuration to the VM, ...
Massimo's user avatar
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Multiple DHCP REQUESTs from the same box - with address provided

Please share how to stop/block/identify the rogue device. Lease time is 1 hour. Eventually I may run out of addresses. Attached is log data. My DHCP server provides an address to the Windows 2003 ...
birchard tech's user avatar
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isc-dhcp issuing wrong ip for subnet

i've configured a range of IP pools to a new server i've configured. the client contacts the correct router IP for the assigned subnet, but receives an IP completely out of scope for the subnet. the ...
Simon Elliott's user avatar
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Debian DHCPv6 get static configured IPv6

I configured the DHCPv6 server to return a fixed IPv6 for a specific DUID, how can I get this IP on a Debian client? If I release the current lease with dhclient -6 -r the current DUID is lost and ...
Stezy's user avatar
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suse isc dhcpd dhcrelay no ipaddress

I have the following setup: Client --> eth2(10.4.0.1/16) - router / - eth1(10.3.0.1/16) --> dhcp-server(10.3.0.150) dhcp-relay If the client starts a dhcp-request ...
JonesK's user avatar
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Iptables setup with 2 nic using DHCP(isc) and DNS(Bind9) issue on Ubuntu

Having an issue with my Linux as a gateway setup. Not sure what I'm doing wrong here. What is expected: Computers have services forwarded based on DHCP reserved ip addresses. I can reach the servers ...
timcoolmode's user avatar
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How to assure that DNS requests are asked to a specific DNS server

I have a set of virtual machines that I have to configure for an assignment. I configured a DHCP and a DNS server at my server machine. At the DHCP file the option-domain-name servers is pointing to ...
hello world's user avatar
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pfSense: Local subdomain per Interface w/ DHCP

I am running pfSense 2.3.2-RELEASE-p1 with multiple local interfaces, each with a DHCP service configured. The DNS Resolver service is configured to register DHCP leases and DHCP static mappings. In ...
Tim Jones's user avatar
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How do I allow clients to lease ip addresses with DHCP through iptables?

I have looked around and I am very confused on how I can forward dhcp request to client using iptables. I understand that DHCP works on two UDP ports 67 for server side and 68 for client side. My ...
Scott Summers's user avatar
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network drops, dhcp renewal fails

I'm struggling with a dhcp problem at work and can't seem to find a solution. I'm not sure if you can help me but I thought I could give it a try, as I have the feeling I tried almost everything in my ...
Lord Pou's user avatar
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DHCP/DNS and multiple VLANs

I'm having an issue regarding DNS/DHCP and multiple VLANs, the following network scheme is in-place: The DNS Server is running along the AD Server on one VM (Windows Server 2008R2 version) and the ...
rgomez's user avatar
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Validating DHCP Rebroadcast by Router?

I have a datacenter network in which I need to test DHCP across subnets. I have a smart switch which is configured to rebroadcast DHCP requests in any subnet to the broadcast address in my admin ...
Naftuli Kay's user avatar
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Setting dnsmasq_config_file with Puppet managed OpenStack installation

Our OpenStack installation is rolled out with Puppet. We use the excellent puppetlabs-openstack module for that. Due to the slow turnover cycles we are still stuck with version 5.0.2, right now we ...
Matthias Steinbauer's user avatar
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DHCP Relay agent not working

I'm quite new to the DHCP Relay Agent thing, but it seems to be best solution. So here is the deal: DHCP server (Win 2012R2) is at 10.0.3.1/24; ServerB (Win 2012R2) is at 10.0.3.3/24 and 10.0.2.1/24. ...
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DHCP snooping on distribution layer stops cliens on access from getting ip address

Here is my topology: sw1(gi0/1 trusted port)->sw2(gi0/1 trusted port)->core-sw(gi0/1)->DHCP_server at the beginning i only configured sw1: ip dhcp snooping ip dhcp snooping vlan 18 int gi0/...
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Multiple interface Red Hat 6 ISC DHCP Server sending Incorrect PXE next-server

My setup: Red Hat 6.7 isd dhcp server 2x networks connected (A and B) One DHCP pool configured on Network A When I had this server set up on a single network ("A") it worked fine, now that I added a ...
phealy3330's user avatar
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Why was the previous authenticity of the host ignored?

I'm on Ubuntu 14.04 Desktop. I have just logged into other machine (Ubuntu 14.04 Server) using ssh in one terminal. I'm still connected. When I did scp in another terminal (opened earlier) to move a ...
Rodrigo's user avatar
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DHCP removing existing DNS records when asked for leases and none are available

I'm having a problem with my Dynamic DNS and DHCP setup where clients requesting leases when none are available causes a cascading failure where existing clients have their forward and reverse DNS ...
frozenfoxx's user avatar
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DHCP: bad configuration fixed-address?

My configuration of DHCP is: dns-update-style interim; default-lease-time 86400; max-lease-time 86400; authoritative; log-facility local7; subnet 192.0.1.0 netmask 255.255.255.0 { pool { option ...
Kintaro Oe's user avatar
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Sonicwall DHCP timeout after AWS VPN tunnel

I have just setup an AWS VPC with a hardware VPN tunnel to our datacenter via a Sonicwall NSA 4600. Everything is working fine with the VPN between Amazon and our datacenter, but the DHCP has stopped ...
David Flahive's user avatar
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DHCP Server Port-Based Address Allocation on Cisco switch 2960-x

I am trying to configure DHCP Server on a Cisco 2960-X switch to achieve port-based address allocation. I would like the IP address assigned to any device connected to that port to be the same every ...
Allay Desai's user avatar
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975 views

dnsmasq dhcp-range for different access points

Is there a way to configure dnsmasq to hand out IPs from different range to different wireless access points? I have a basic Asus router configured as access point (it does no routing and doesn't run ...
Budric's user avatar
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ip dhcp excluded-address command no work

I want to provide 1.1.1.101 to 1.1.1.126 using dhcp pool. Here is my configuration no ip dhcp use vrf connected ip dhcp excluded-address 1.1.1.1 1.1.1.100 ip dhcp excluded-address 1.1.1.127 1.1.1.254 ...
primary chicken's user avatar
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Dual stack linux router, can't forward IPv6 prefix

I have a small offic here with a few workstations and I would like to implement a small server for stuff like a proxy server, samba etc. This is the topology of said network: +-----+ dynamic +---...
Leo's user avatar
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set host-name failed on Ubuntu vivid

With Ubuntu vivid, I cannot bind the hostname of my server with the IP address gotten by a DHCP server I tried to add in dhclient.conf (and reboot) set host-name "myserver"; But, still doesn't work....
Stef's user avatar
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Using Clonezill/DRBL DHCP as main DHCP server

Right now in my department we are running a DHCP server on some older hardware that is looking like it might fail soon(ish) and is also running CentOS 4. We'd like to upgrade to a new DHCP server but ...
Ian's user avatar
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DHCP failover/DNS not working when primary server is offline

In a VMware environment we deploy daily many new virtual hosts and for this we need a failover DHCP/DNS. Based of CentOS 7 I setup two virtual hosts as failover DHCP and dynamic DNS (dns01/dns02). I ...
Werner's user avatar
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Wireless clients loosing network access randomly

We have the following setup at the office: Windows Server 2012 DHCP Unifi AP (one of these rounded beauties) set up to use WPA2 with AES Zyxel ZyWALL 110 as firewall Some of the clients (laptops) ...
sfThomas's user avatar
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Weird behavior with multiple pool inside shared networks on isc-dhcp-server

I have a weird behavior on my dhcp-server, I am using a load balance configuration and using multiple pool inside that shared-network, I have this configuration: shared-network "my-shared-network" { ...
Roberto De Oliveira's user avatar
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383 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 ...
PGP's user avatar
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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 ...
Mehdi Yedes's user avatar
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309 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 ...
ZorbaTHut's user avatar
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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 ...
Laurentiu's user avatar
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1 answer
859 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....
Tillebeck's user avatar
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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 ...
David Mackintosh's user avatar
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749 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 ...
3iron's user avatar
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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 ...
Jhon Castro's user avatar
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499 views

How to set up a simple Cisco ISG config for controlling internet access

First off, here is my config so far. http://pastebin.com/fV2NGCE2 I've gone through a few guides online and the 15.2s manual and the xe3 manual for Cisco's ISG (intelligent services gateway) and ...
lukeismighty's user avatar
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Incorrect DHCP ID (MAC address) listed for clients on Windows 2012 Server

System Info: I have an Active Directory domain controller, Windows 2012r2, running DNS, and acting as a DHCP Server. In the domain I have four Apple Mac OS X client systems (running Yosemite, 10.10.2) ...
TheMessenger's user avatar
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691 views

2008R2 DHCP Server Becomes Unresponsive

At the end of 2013, our single Windows Server 2008R2 DHCP server started becoming unresponsive once every week or so. The server itself was up, but the DHCP server was unresponsive. Attempts to ...
wizardscantswim's user avatar
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1 answer
2k views

Ubuntu 14.04 can only access outside networks if using DHCP, not static IPs

I am configuring some server on Ubuntu Server 14.04 (no GUI) and I am have the following configuration: auto lo iface lo inet loopback ## Management network eth0 auto eth0 iface eth0 inet static ...
Ethode's user avatar
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dhcp relay with failover to local service

I'd like to set up a dhcp server which normally relays to a central site, but has a pool of addresses to hand out if the link to the central site goes down. I'm using isc dhcp server on Debian, but ...
AlexKing's user avatar

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