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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How to setup metric for routers on CentOS DHCP server

I have a simple DHCP server running on CentOS 6 with the following configuration: subnet 192.168.1.0 netmask 255.255.255.0 { allow booting; allow bootp; ddns-update-style none; range ...
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0answers
89 views

How can I find which application is changing my routing table? [closed]

My setup is: Panda <--> PC. PC runs DHCP server. Panda gets IP settings from PC. After DHCP is done Panda has the following routing table: Destination Gateway Genmask Flags ...
2
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2answers
200 views

DHCPD clean leases on client disconnect

Is there a way to force ISC DHCPD to trigger expire or release for static lease right after client disconnect? I want to trigger a script right after client connects ("on commit" DHCPD event) and ...
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3answers
125 views

Prevent IP conflict from untrusted network machines

I maintain a small LAN (192.168.1.0/24) on which we have several untrusted machines, where the users of those machines have administrative rights or are able to connect their own machines to the ...
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1answer
225 views

Windows 2008 R2 DHCP - client renewing too frequently

We are running a Windows 2008 R2 DHCP server. We just added a new DHCP server and removed the old one about three weeks ago. I have an employee who is reporting IP conflict errors every day now for ...
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1answer
58 views

PXE Booting: Default boot file name?

When implementing PXE booting, is it necessary to specify a specific boot file in the DHCP options, or can you have a default boot file and so not specify that option?
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1answer
253 views

Push hostnames to a DNS server without DHCP

Considering the complete lack of luck I've had googling any terms related to this question, this may not even be possible, but: Is there a reasonably standard way to set a hostname on a machine, and ...
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1answer
96 views

Multiple DHCP servers on a single physical network?

Today i got put on a project to solve a networking project for a friend who rents out multiple office suites. Internet is provided to all suites in the rent cost. The guy who originally set everything ...
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2answers
83 views

Assign private IP via DHCP + public IP

I would like my Ubuntu VM to have both a private IP and a public IP. The private IP should be supplied by my DHCP server. Currently I am trying this: auto lo iface lo inet loopback # The primary ...
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1answer
96 views

Enterprise DHCP server solution? [closed]

I have a network of about 1000 assorted devices, all of witch are running by static IP addressing. Given the size of the network and the lapse of technical advice, the addressing scheme is in chaos ...
2
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1answer
2k views

What else does “netsh int ip reset” do?

According to this KB article when you run the "netsh int ip reset" command, all it does is to reset the content of two registry keys: SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\ ...
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2answers
396 views

PXE DHCP configuration with existing DHCP server

How am I to configure my DHCP service, so that it handles PXE requests while there is still another DHCP server on the network? I managed to set up a working PXE system in a separate environment (One ...
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2answers
79 views

Centos TFTP boot server without a dhcpd server

Good Day, I want to ask the comunity if it is possible to setup a TFTP boot server without running a local dhcpd server on the local box? The setup currently looks like this? What is currently ...
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1answer
30 views

Setting up DNS for Remote Access

I have Windows 2012 with the DNS/DHCP features installed. Do I need to install Active Directory and then add all my machines to the domain of local.FQDN.com for example? I can do this and still use ...
0
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1answer
182 views

CentOS 5 domain-search from DHCP server ignored by dhclient

I have a DHCP server running ISC dhcpd which offers the option domain-search "domain.local"; option. This is being ignored by a particular CentOS 5 dhclient which is removing the search parameter in ...
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0answers
76 views

Issue with routing across two networks with DHCP and NAS involved

I have a Linux network set up with three sub networks 192.168.1.0 (chaos), 192.168.3.0 (chaos-hs), and 192.168.5.0 (ute-netz) with three machines casimir, ute, raspberry, a nas server nas and a router ...
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1answer
113 views

2 DHCP Server it is possible to set a default server and a second

i have the following question (Problem) i have a AVM Fritzbox 7390 as WLAN Router and there is DHCP-service running with a range of 50 adresse. so far i works nice. Know i would like to have a PXE ...
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0answers
34 views

DHCP Randomly Not Assigning Addresses

Having a strange issue for the past day or so. Some users (probably about a dozen, dozen and a half out of 100 or so) are having trouble pulling DHCP. They are getting the private IP address. If I ...
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3answers
104 views

Why first dhcp server not used? [closed]

I have hardware connected to router with DHCP server. That router has MAC reservation to make sure hardware be assigned to specific IP. When this setup isolated everything is fine, but if I connect ...
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0answers
97 views

How do I stop a Linux computer from sending a DHCP hostname?

I need to set up a Linux computer so that it uses DHCP but doesn't send any hostname at all. I'm using isc-dhclient-4.2.4 /etc/dhcp/dhclient.conf contains the line send host-name = gethostname(); ...
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0answers
70 views

dhcpd set ddns-hostname from client supplied hostname

Basic issue: I'm trying to setup BIND and DHCPD. I have both working and the only problem is DHCPD cannot update BIND zones with names of dynamic clients (those without static leases). By trial and ...
2
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2answers
180 views

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 ...
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0answers
152 views

Static IP installation of AD domain server and DHCP [closed]

I have recently obtained 5 static IP addresses from my ISP. I now want to install a Windows 2008 server 2008 with domain controller and DHCP roles and use these static IP addresses. I have a ...
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2answers
152 views

Set specific DHCP options on a static IP address connection

Our network has some not-commonly used DHCP options on it, including some vendor-specific options (e.g. option 002 for Time Offset set to 0x9AB0). I have one particular computer that for whatever ...
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1answer
127 views

dhcpd update bind dns server on non standard port

I have most of a dynamic dns set up working. I can manually update the DNS entries using nsupdate and my dhcpd.conf file will attempt to set the DNS entries. However this fails as I don't have bind ...
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101 views

Laptop using DHCP lease from another network

We have a laptop with intermittent wifi connectivity problems. Rebooting often helps. Today while digging around I noticed that its DHCP IP address and gateway are not addresses on our subnet. The ...
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1answer
404 views

WDS deploying Different architectures (64-bit and 32-bit) with a single boot image

At the moment I have a WDS server set up with 2 Windows 7 boot images (32 Bit and 64 Bit) because we are running a mixed environment which will stay mixed for the near future. We are moving to a VLAN ...
1
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1answer
51 views

Lost as to what I'm not doing in setting up a home lan network [closed]

I'm a PC repair tech and this is a problem I've recently been trying to troubleshoot for a customer. Upstairs they have the main router which servers as the gateway and router, both hardwired and ...
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2answers
211 views

How to DHCP request a second, different, IP for the same physical interface?

(Similar to this question, but with two different DHCP-assigned IPs) Is there any way to let dhclient or dhcpcd request two different IPs for one physical interface, e.g. via virtual interfaces eth0 ...
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0answers
62 views

DHCP server with ability to update mac address dynamically

Is there a better way to maintain MAC to IP specification in dhcp with out restarting dhcp service each time when there is an update. is it possible to use DHCP with database in Linux to save all ...
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1answer
999 views

Aliased network interfaces and isc dhcp server

I have been banging my head on this for a long time now. There are many discussions on the net about this and similar problems, but none of the solutions seems to work for me. I have a Debian server ...
13
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4answers
1k views

Windows DHCP Server - get notification when a non-AD joined device gets an IP address

SCENARIO To simplify this down to it's easiest example: I have a Windows 2008 R2 standard DC with the DHCP server role. It hands out IPs via various IPv4 scopes, no problem there. WHAT I'D LIKE I ...
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1answer
372 views

pfSense - DHCP Relay

I have 3 pfSense boxes acting as routers on a single subnet (172.22.12.0/26). Router A - 172.22.12.1 Router B - 172.22.12.17 Router C - 172.22.12.33 I want Router A to be the only DHCP server. ...
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1answer
740 views

Assign two static IP addresses to one mac address

Can Isc-dhcp-server give two static ip addresses to one mac address? I have several Genexis terminals in my network. Each terminal have two interfaces, one for public traffic and one for a management ...
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2answers
87 views

Controlling 2 DHCP servers in one network

In my customer network, we have 2 DHCP servers. One is fully controlled by me and another by a different vendor. I want to make sure a set of devices (my devices) when connected, should get IP address ...
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0answers
645 views

CentOS 6.4 - Cant get an IP from DHCP

I have a Ubuntu and CentOS system running on XenServer. The Ubuntu Box gets and IP from DHCP no problem. The CentOS will not take a DHCP but a static address works fine. [root@XenCentOS ~]# service ...
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3answers
1k views

How do I protect a low budget network from rogue DHCP servers?

I am helping a friend manage a shared internet connection in an apartment buildling with 80 apartments - 8 stairways with 10 apartments in each. The network is laid out with the internet router at ...
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0answers
132 views

ISC DHCPD IPv6 for multiple interfaces

I want to assign multiple IPv6 to a server with multiple NIC. As IPv6 RFC defines, each server has a unique DUID that can have one of the 3 formats (LL, LLT or enterprise). And each NIC has an IAID. ...
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46 views

How to treat DHCP_REQUEST with xid different from the last DHCP_OFFER?

I am maintaining a custom DHCP server implementation. There is a client that consistently changes xid after receiving our DHCP_OFFER, thus, xid in its DHCP_REQUEST is different from the one used in ...
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2answers
225 views

DHCP serving has stopped working

Something happened in our server room over the weekend that had me in the office late Saturday night replacing two switches. After powering down both racks, I have an issue where none of the computers ...
0
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1answer
44 views

Changing from router DHCP to Server DHCP [closed]

I want to setup a Linux DHCP server instead of a router based DHCP. I'm guessing that I will need to turn off the router DHCP, but keep the router as the gateway. I think that the BCAST DHCP requests ...
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1answer
140 views

Using DHCP on virtual servers (ESXI) [closed]

I am setting up a small lab with 5 virtual servers running on VMware ESXi 5. The servers are: Network Services server (CentOS 6.4) LAMP server (CentOS 6.4) File server (CentOS 6.4) Zimbra mail ...
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0answers
52 views

BOOTP on Juniper 4200 stack works one one subnet, not another

I have a Juniper Stack that connects vlans 10,11 and 50. 10 is servers, 11 is desktops and 50 management. Bootp is redirecting DHCP requests to a AD box on 10.x just fine for 50 vlan, and worked well ...
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2answers
194 views

DHCP split-scope using Windows 2008 and Windows 2012 servers

Can I configure DHCP split scope using our current Windows 2008 server with DHCP, and a new Windows 2012 server which I have installed DHCP on?
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3answers
241 views

How to get machines to use a DNS without a fixed IP, which does not appear in the DHCP lease? [closed]

I have some machines on a network. This network has a DHCP server - which I have no control over, and no DNS server, i.e. the DHCP lease refer you to some ISP's server and do not serve IPs for local ...
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3answers
236 views

Windows 2008 Domain - DHCP on Server vs Firewall

I currently administer a Windows 2008 domain network with DHCP running on the DC. Clients obtain addresses dynamically and servers are assigned static addresses. In the case that the DC fails ...
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1answer
221 views

DHCP over PXE fails, but in the OS it works - with configured (R)STP

I'm trying to PXE-boot desktop-machines to install a new OS over the network, but it isn't picking up an IP address via DHCP during boot. When an OS is already booted on the machine, it is working ...
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2answers
364 views

how to disable RRAS on windows 2008 r2 pre-reserving blocks of IPs

I have a problem where one of the DHCP scopes has exhausted its scope of IPs. Investigating, I found that a couple of the window 2008 r2 servers were reserving blocks of IPs for RAS running on the ...
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1answer
83 views

Private DHCP through a switch using two eth interfaces?

Right now, I have an Scientific Linux blade connected to the internet on eth3, and connected to a 48 port Cisco switch on eth2. This Cisco switch is connected to the eth2 of 24 blank blades (which are ...
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0answers
103 views

How to send several instances of the vendor-specific options to a DHCP server using dhclient?

I need to send vendor-options to DHCP server using dhclient (ISC). I've added following lines in the dhclient.conf: option dhcp6.vendor-class code 16 = {integer 32, integer 16, string}; send ...