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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2answers
100 views

Windows domain + Linux Domain on One Network

Currently our network is all tied to Active Directory with both Windows and Linux workstations/servers. We would like to implement a Free IPA server that synchronizes authentication between a Linux ...
4
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2answers
171 views

How can i locate rogue DHCP servers? [duplicate]

I am investigating some odd behaviour on a sub-net, where host registration doesn’t list some of the IPs that some users report having. Now that I’ve seen evince, i want to passively scan for the ...
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2answers
87 views

How can NIC's remember the DHCP address past power off? [closed]

I have now seen an HP ProLiant DL385 G7 (573088-421) and HP ProLiant DL360p Gen8 both being able to remember the DHCP address for its NIC's even though I had powered off the server, and pulled the ...
1
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0answers
56 views

Access Denied DHCP Tool

I cannot figure out why this is happening, when opening the DHCP tool on my server, I get the following message. Access Is Denied You do not have access to this DHCP server. To view information ...
0
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1answer
164 views

Foreman errors out when provisioning using an ms-dhcp/dns smart proxy

Im running foreman, with smart-proxy on a win2k12 r2 box running ad/dhcp/dns. When i try to provision smart proxy dumps this to the logs: Changed the current scope context to 192.168.20.0 scope. ...
0
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1answer
2k views

KVM/libvirt: How to configure static guest IP addresses on the virtualisation host

What I'd like to do is to set the guests' network configuration (IP address, subnet, gateway, broadcast address) from the host system. The used network setup is in bridge mode. How can I configure the ...
0
votes
1answer
221 views

Can't Access Network Drives through VPN

My issue is that when I'm outside the office I can't access any of my network drives. I can't UNC to them, through the FQDN or IP address. For example, domain.local\folder, or 172.26.6.2\d$. ...
0
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0answers
18 views

What is the default behavior when a RHEL 6.x DHCP client fails to renew its address?

I have had experience with some RHEL 6 servers that were found unreachable, and investigation of the console revealed that they had failed to renew their IP address, and eth0 was without an IP. There ...
0
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1answer
164 views

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; ...
1
vote
1answer
123 views

DHCP Option 66 ignored?

Im trying to setup a PXE boot server to deploy CloneZilla images easily, using pxelinux.0. I have a tftp-hpa server running on a server, I tested it with a client and it works fine. We are using a ...
0
votes
3answers
101 views

Split a Scope Linux<=>Windows

Is it possible to create a DHCP Failover Cluster between a Linux(Ubuntu) based server and a Windows Server 2012R2 based server. My idea was to include a new data into the dhcp.conf data to exclude a ...
1
vote
1answer
240 views

isc-dhcp leases file never cleaned

When running isc-dhcp the leases file seems to grow indefinitely (several hundred MB). If I restart the isc-dhcp service, the file shrinks to 1.5MB. How can I have isc-dhcp flush expired records ...
1
vote
0answers
740 views

Force Windows DHCP to Update DNS for All Current Leases

Is there are way to force Windows 2008R2 DHCP Server to update all DNS entries for all current leases? (Guess the server-side equivalent of ipconfig /registerdns) We had a configuration issue with ...
0
votes
1answer
37 views

Subnetting new address cannot connect to internet

I re subnetted our network from 10.1.24.1-254 subnet 255.255.255.0 To 10.1.24.1-10.1.25.254 subnet 255.255.254.0 I've changed all the devices subnets. The computers come online and get dhcp. They ...
0
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0answers
46 views

DNS options on Cisco switch providing DHCP

At the company work for we decided to move DHCP duties from a Windows server to our 3750-X switch stack that's the gateway for our network. I researched the commands needed and cobbled together the ...
0
votes
1answer
53 views

Windows Network Sharing - DHCP and Gateway pass through

I have several Windows 8 machines that are setup to do connection sharing over a wifi connection with switches behind a gigabit NIC. The devices behind the machines are Cisco phones and they are ...
2
votes
1answer
56 views

Preventing IP Phones from eating up DHCP addresses

We just installed a new IP phone system. The phones get their configuration via DHCP, which includes an option to set the phone to a different VLAN. The phone then requests an address via DHCP on that ...
0
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2answers
96 views

DHCP server - No IP for computers out of the domain

I would like to know if there is a way to deny leasing an IP address through my MS DHCP server to computers which are not registered in my domain. Thanks!
0
votes
2answers
2k views

Cannot ping a VM from a Hyper-V host

I am facing a weird situation in my network environment. My infrastructure looks like this: I have a D-LINK DIR-635 acting as my default gateway (192.168.0.1) A physical Windows 2012 Server ...
0
votes
1answer
78 views

Linux static dhcp ip for visitor access internet without requesting MAC address? [closed]

Currently, my company internet access for visitor are required to request MAC address from them if they want to access to internet. Can we do something like the Hotel wifi? they just access to the ...
0
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0answers
26 views

Draytek AP Wireless Bridge IP Issues For LAN Devices

OK, I have a very messy network at my office, piggybacking off a neighbor's WIFI for internet (with their permission). I have a Netgear Router + DNS (DGN2200) connecting via LAN to a Draytek 800AP. ...
0
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1answer
51 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
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1answer
41 views

Configure DHCP role on windows server without starting it

we want to migrate our dhcp service from a linux server to a windows 2008 r2 server. We have a huge list of mac-ip static leases. Is it possible to install a dhcp role on the windows server and ...
2
votes
1answer
58 views

Two LAN cables when using Remote Access Card?

I recently bought a HP MicroServer N54L and a HP Remote Access Card. Connecting to the server over a KVM viewer for BIOS setup etc. works fine, but when it comes to installing Ubuntu 14.04. the ...
0
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0answers
37 views

How to fix stalled connection on large download

I have a cisco 1921 router performing routing and NAT function. Cisco 3750 is performing layer 3 core switching duties. Users are complaining about large file transfers being stalled (not dropped) ...
0
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4answers
240 views

Who has the highest priority DHCP or static IP?

I have a printer at work, for some reason the router refuses to assign a specific IP for that printer via DHCP reservation and I had to configure it with a static IP. Sometimes the printer is off. I ...
1
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1answer
118 views

Cleanup DHCPD leases as well as DDNS Entries

I have a fairly simple set up on a Debian server I'm running. I currently have isc-dhcp-server installed along with bind9. I set up my zone and my reverse lookup zones and set up dynamic updates, it's ...
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votes
1answer
37 views

Get dhcp ip from a specific server [closed]

In a network that comes with two dhcp servers, how can I get network configured from one server instead of the other? Let's say there are 2 dhcp servers named A and B. My computer always get network ...
0
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0answers
41 views

WDS and DHCP - PXE-E11/55 errors

I have been doing some testing with MDT/WDS and yesterday, out-of-blue, my virtual PC doesn't want to boot from a network to WDS server. Here is the setup (all stations are virutulized, vSphere 5.5): ...
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votes
1answer
54 views

Edit dhcpd.conf through the WEB page [closed]

Good afternoon. Please suggest an elegant way to solve the following question: There is a server on Linux (CentOS 6.5 x86) with dhcp/nfs/http/tftp, which is used to load the images on specialized ...
1
vote
1answer
174 views

DHCP Trouble; getting APIPA addresses

I am having trouble with the DHCP Client. I am using a Netgear fvs336gv2 firewall. I recently upgraded to the new firmware and did a factory default reset and reconfigured all the vpn tunnels and LAN. ...
8
votes
2answers
835 views

Domain Controller offline for a few days

My primary domain controller died over the weekend, its motherboard is being replaced tomorrow. I have been told that the mac address of the server may change once the new motherboard is installed. ...
1
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1answer
80 views

DHCP on main interface (eth1) and static on eth1:0

So the configuration is a bit weird, from our internet provider we get an IP via DHCP, there's also a whole subnet that's routed to this IP. I solved it by adding a second interface with the static ...
0
votes
1answer
44 views

incorrent subnet/mask combination

For a network interface, I have defined a range of addresses for DHCP. 3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000 link/ether 08:00:27:5a:3e:be ...
1
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0answers
42 views

force dhcp server to always run

I have an Ubuntu machine with two Ethernet network interfaces and on one of them I am running a DHCP server (isc-dhcp-server). I noticed that the server daemon stops running whenever I suspend the ...
1
vote
1answer
321 views

DHCP_HOSTNAME isn't working consistently in RedHat 7

Under RedHat/Centos 6.x I used DHCP_HOSTNAME=`hostname -s` in /etc/sysconfig/network-scripts/ifcfg-eth0 to pass client hostname to DHCP for registration in DNS and this worked flawlessly. I'm now ...
0
votes
1answer
120 views

Query DHCP with mac address

I am trying to create a dynamic IP resolver using python3 on linux to query a windows DHCP server and return the IP that it would be given. My purpose is to supply the returned IP address as a ...
0
votes
2answers
514 views

Gateway gets stripped from DHCP Reply through OpenVPN tunnel

I have a bridged OpenVPN setup. This is my server config: port 1194 proto udp dev tap0 ca /etc/openvpn/easy-rsa/keys/ca.crt cert /etc/openvpn/easy-rsa/keys/server.crt key ...
2
votes
1answer
108 views

Cisco AP vlan setup

I have been racking my brain since last night and all morning with this problem...luckily it's not in a production environment yet. I have done many searches and have come up with the same responses ...
1
vote
1answer
108 views

Configure OpenNebula to use DHCP

I'm trying to configure OpenNebula to use the DHCP server that already exists on my network. Yes, I already know that OpenNebula manages virtual mac addresses rather than IP addresses, but that ...
2
votes
1answer
50 views

Is it possible to add a description on a Windows DHCP Server exclusion range?

Is there way to set a description on an exclusion range within the DHCP server in Windows Server 2012, beyond the default of "IP addresses excluded from distribution"?
2
votes
2answers
235 views

DHCP failover didn't work when one server was offline

I'm running two DHCP servers both with Windows Server 2012. They are set up as with high availability using "load balanced, split 50/50." They named DC1 and DC2. This morning, DC1 was frozen, there ...
0
votes
2answers
43 views

Can I configure a connection a network with a gateway with a static ip to a network where the gateway address is assigned via dhcp?

I have two networks with each gateway on a separate network device on a single computer. One is a static ip network on the ethernet device, the other is a wifi connection to a router that is assigning ...
1
vote
0answers
27 views

Windows DHCP MAC-Range to Scope allocation

I wonder if there is any options to map a specific Range of MAC addresses to a specific DHCP address scope. The thing is, I want a specific scope for address allocation to bridged Virtual Machines ...
0
votes
0answers
84 views

ISC DHCP Server - Client Uplink Is Not Working

Running a DHCP server, client(s) does not have up-link (0Mbps) and has a downlink (50Mbps.) I am setting up a gateway/router on a PC running Debian Wheezy with ISC-DHCP. I have 1 WAN (eth0) and 2 LAN ...
0
votes
0answers
188 views

OpenVPN Linux Client does not bring up tap0 interface

I have an OpenVPN client on Linux connecting to an OpenVPN server. The server assigns IPs via DHCP, thus I connect using the tap interface rather than the tun interface. OpenVPN connects, ...
0
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0answers
168 views

Issuing 'ip dhcp relay information trusted' command on a VLAN interface

I was reading this article - Allowing option 82 in Cisco DHCP relay agents. It says As a security measure, Cisco IOS will not forward DHCP requests that contain Option 82 information and a ...
2
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0answers
197 views

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 ...
0
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0answers
263 views

Windows 7 Pro - DNS Servers changed on DHCP-enabled workstations over weekend, not sure how

This morning I came in to our SOHO office (>5 users) to reports of the internet not working. I tried all the usual simple fixes like cycling switches (each user has a switch at their desk) then I ...
1
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0answers
67 views

Binding ISC DHCPD to a virtual (heartbeat) interface

I had a DHCP server that acted as a relay endpoint and worked fine. let's say this is a solo machine with eth0 with an ip of 192.168.0.10 I needed to bring this server down and join it to a cluster, ...