Dynamic Host Configuration Protocol (DHCP)

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Ubuntu server dhcp - duplicate leases

So we have an ubuntu server running DHCP & DNS managed through webmin (because it's less effort ) Nothing is BROKEN, but I noticed duplicate leases showing. Anyone know why and how I can prevent ...
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1answer
680 views

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 ...
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1answer
450 views

Combine static and dynamic setup in dhcpd.conf

I'm trying to migrate from a situation with static ip addresses and a dhcp server on a router to one new dhcp server. My idea was to add the current static ip addresses as static ip addresses in the ...
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309 views

ISC-DHCPD: why does it cease to work when the internet is down?

For as long as I've been using a DHCP server on Linux or even FreeBSD (all come from ISC if I recall correctly), it seems that it just doesn't know what to do with DHCP requests when the Internet goes ...
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3answers
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Ranges for Multiple DHCP Server: Better to overlap or separate? wireless vs ethernet clients?

I know there are mixed feelings about running multiple DHCP servers on one LAN, but I'm wondering about the best way to set their ranges. In my case, I have a router which performs DHCP and also my ...
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3answers
3k views

Stop DHCP client from receiving old IP address on new VLAN

I have one DHCP server running Windows Server 2008 R2. It is configured with one Superscope which contains 5 member scopes. One scope for each one of my subnets. Here is the problem, if I am on VLAN ...
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1answer
107 views

DHCP IPV6 Environment [duplicate]

Possible Duplicate: DHCP IPV6 Environment in DHCPV4 for discover, request we mention the source ip as 0.0.0.0,what it could be the in DHCPv6.Similarly we mention the multicast address as ...
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4answers
684 views

Can ONE dhcp server serve 2+ network ip range

I have only One dhcp server which has only one interface with ip address 10.0.0.1/24. The dhcpd.conf are like: subnet 10.0.0.0 netmask 255.255.255.0 { <-------working host yyy { ...
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1answer
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ISC-DHCP-SERVER - Can different reservations get different options (router, DNS, etc)?

Suppose there's just one Ubuntu / ISC-DHCP (v3) server on the network. I've successfully been able to provide "DHCP reservations" meaning MAC foo gets ip 1.2.3.4, whereas everyone else just gets an ...
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1answer
4k views

Hyper-V virtual machine unable to get IP address from DHCP server running on same physical box

We have a Windows server 2008 R2 with two network cards running AD, DHCP, DNS and Hyper-V The first nic is setup with a static IP address and DHCP, WDS, and DNS are bound to it. The second nic is ...
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98 views

Windows Deployment Services

I have a slightly advanced Windows Deployment Services setup. My router hands out DHCP addresses, including the following config. ip dhcp pool Servers_100 network 192.168.100.0 255.255.255.0 ...
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1answer
181 views

DHCP IPV6 Environment

May I know what are the changes needed in the DHCP message formats if I want to convert into ipv6 environment? Now I am using ipv4 dhcp client and ipv4 dhcp server. But I want to implement this using ...
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1answer
5k views

Can a DHCP reservation use an IP address in the exclusion range?

Windows Server 2008 R2, running the DHCP service. DHCP Scope: 192.168.1.1 - 192.168.1.254 Exclusions: 192.168.1.1 - 192.168.1.99 If a reservation uses an IP address in the exclusion range (like ...
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2answers
1k views

Install a dhcp/tftp server on debian

I'm trying to configure a dhcp server on my Debian computer in order to run a tftp server. I have 1 nic which is eth0. I followed several tutorials but none of them worked with me. I installed ...
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1answer
273 views

Setup dhcpd without gateway on purpose

I have an XP machine with two network interfaces. One is connected to my company's network (and the Internet). The other is a very local network which connects some hardware with my PC. Both the ...
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4answers
2k views

How to configure TFTPD32 to ignore non PXE DHCP requests?

I want to give our Windows guy a way of easily PXE booting machines for deployment by plugging his laptop into one of our site networks. I've set up a TFTPD32 configuration which does just that, and ...
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1answer
480 views

How do I setup Ubuntu interfaces so one interface is “mapped” to another?

I have recently setup a DHCP-Server on an Ubuntu 10.04 server machine. The machine has two interfaces (eth0, eth1). I have the DHCP server setup correctly because computers connecting to the network ...
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2answers
545 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 ...
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1answer
71 views

Setting Windows Server 2003 DHCP

I have a Windows server 2003 with two NIC one is setup to connect to the network with static IP/internet, and the other one is supposed to be used internally as DHCP server. However I am having ...
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2answers
17k views

Linux DHCP server option 43 vendor-encapsulated-options, how to format/encode?

I admin the network for a small business which has an IPCop firewall box providing DHCP services to the network (and various other services). The DHCP server in IPCop appears to be dhcpd and IPCop ...
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1answer
541 views

Is it possible to make ISC dhcpd (IPv6) 4.2.2 unicast-only?

I ask because the server is handling DHCPv6 for two VLANs and I can see some requests both via DHCPv6-relay from our ProCurve switch and via the ff02::0:2 anycast address and responds to both ...
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1answer
263 views

View DHCP Server Leases

How can I view the dhcpd.leases without having to SSH into the box and view using vi/nano etc. I used to have webadmin set up on another box but that was when I used the GUI to configure dhcp. Now I ...
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2answers
240 views

DHCP configuration problem

EDIT: We have following setup: User comes to building, he gets address from range for unknown clients (192.168.100.0/25) and can only get to our web site. We call it anonymous range. Let's say our ...
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2answers
2k views

Two DHCP server in the same subnet

So I change jobs recently and in this new workplace I've found that we've actually got two DHCP servers. In the very same subnet, and they both have the same scope. I did not set up this but I see ...
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4answers
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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 »... ...
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3answers
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Windows 2008 R2 DHCP for two scope on two interfaces

I'm setting up a brand new DHCP Server over Windows 2008 R2 Standard edition server, and I'm planning to serv two differents lan with this one. Here is my configuration: 1 AD/DNS/DHCP Server with ...
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1answer
801 views

dhcp-server + iptables: Can't share ppp internet connection

I had this configuration before, and it used to work well, but now I got a new server and I can't setup it to share the internet connection from ppp0. I'm on Debian testing. The client connects ...
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1answer
263 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 ...
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3answers
1k views

How to forward DHCP requests through router to Win 2k8R2 server?

I have a D-Link DGL-4500 and I've been using that for a long time as my DHCP server. I now have a Windows Server 2008 R2 machine plugged into it and I have set it up as a DHCP server. I don't have 2 ...
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4answers
20k views

How does a computer obtain an IP address via DHCP?

How does the computer know which device on the network to query? How does the default gateway factor into this? Pretty much, what is the chain of events that occurs when a computer tries to obtain an ...
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1answer
82 views

Problem with accessing a website hosted on a local device connected to the local wireless network

I am running Lighttpd 1.4.28 on an embedded device. Apart from the webserver, I run udhcpd and dnsmasq to allow other devices to connect to my embedded device to access the website. My device has the ...
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1answer
840 views

DHCP requests from wlan client not reaching server

I have a dhcp (and dns) server running on a centos/linux pc, which is the only dhcp server on my network. I have two wireless routers - a Netgear DG834G, and a Netgear DGND3700. The DGND3700 is also ...
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1answer
1k 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 ...
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2answers
436 views

Ubuntu server as DHCP Server and Internet Gateway

In my work environment there is one ubuntu server (dynamic ip) and 6 win7 systems all connected to a switch which is connected to a modem(isp internet). Right now the modem acts as dhcp server and ...
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4answers
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Resolving IP address conflicts on a LAN

We have our LAN set up with DHCPD providing fixed IP addresses to the systems. However we are facing IP address conflicts if some one connects a laptop and assigns an IP address belonging to another ...
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2answers
273 views

Questions on DHCP server setup

I'm fairly new to networking of this so I have a lot of questions... any help is appreciated. I'm setting up a DHCP server and I've run into a few problems... Here is my current setup: Router IP: ...
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3answers
5k views

Multiple PXE server same subnet

I've been struggling with this for some time. I have a few test machines that boot from the network, they receive the boot data from the DHCP server, this tells them who is the boot server where is ...
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1answer
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How to configure vlans with server 2003 DHCP

How do you configure Server 2003 to handle vlans? I believe I need to use the IP Helper in DHCP, but am unsure and am unable to find a decent tutorial or guide on doing this. Can someone help me or ...
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557 views

dhcp-server with 2 subnet problem

How can I have 2 subnets (net1 and net2), one that alloweds all and the other only allowes selected hosts based on mac address? Here is my dhcpd.conf ddns-update-style none; log-facility local7; not ...
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1answer
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DHCP not starting CentOS 5.6

I am having a lot of trouble getting my dhcpd service to start on CentOS 5.6. No matter what configuration I use it fails to start. So I started looking around in the server, I noticed I have no ...
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1answer
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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 ...
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2answers
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Why some DHCP clients are not showing DNS names?

I have a Linux server running ISC DHCPd and BIND DNS. Clients that receive their IP from DHCPd sometimes seem to update the DNS with their DNS info., but sometimes not. Any ideas why this might occur? ...
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1answer
628 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 ...
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3answers
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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 ...
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2answers
452 views

two DHCP servers on the same network - possible?

On my network, I have 3 remote sites and one local that all receive DHCP through our central dhcp server. all the sites have ASAs with dhcprelay and so on. I have two domain controllers - is it ...
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1answer
96 views

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 ...
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2answers
144 views

Can I just drop in a new DHCP server in place of my old one without breaking everything?

Right now, in my office, we have a Cradlepoint MBR1000 wireless router as our DHCP server. It's not as configurable as I'd like for it to be, and I need to set up a VPN, so I am considering replacing ...
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0answers
228 views

dhcpd.conf rule-based mapping

We have ~100 physical nodes which can host a large number of VMs apiece. We need to set up dhcpd on one machine to distribute addresses in a predictable fashion based on MAC address. We'd like to go ...
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2answers
1k views

How do I set SBS 2008 as DHCP-server? I had the router as DHCP-server before

Until yesterday, we had no server at our network, so we used our router, D-Link DFL 200 as DHCP server. The router has IP: 192.168.1.1 and all clients has IP in the range: 192.168.1.10 - 192.168.1.20. ...
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4answers
8k views

Configuring DHCP on RHEL 6

I have a fresh install of RHEL6 and I am unable to find any config file to do advanced configuration for dhclient. I am trying to find something like dhclient.conf on Ubuntu so I can modify options ...