Dynamic Host Configuration Protocol (DHCP)

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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
480 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
70 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
15k 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
521 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
247 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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238 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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776 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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251 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
17k 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
77 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
754 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
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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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415 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
924 views

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
266 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
4k 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
1k views

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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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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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
598 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
1k views

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
444 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
93 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
140 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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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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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
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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 ...
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2answers
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Does NMBD depend on DHCP?

I am trying to debug a SMB share issue on an embedded Linux setup. Before diving into source code, I want to make sure this is not a configuration problem. So here is my case: Scenario-1: dhcp server ...
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2answers
1k views

DHCP log only visible from some programs

We recently changed the DHCP service at my workplace from a RHEL server to a Windows 2008 R2 server. As I'm used to monitoring the logfiles with "tail -f" I thought I'd try to read the logs on the new ...
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1answer
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Linux DHCP Server - Interface Association

I have a question about the dhcp server on linux Basically my server has 2 interface cards eth0 : 192.168.2.201/255.255.255.0 eth1 : 192.168.4.1/255.255.255.0 eth1:0 : 10.1.1.0/24 On this server ...
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2answers
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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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Querying a DHCP server in C#

I have a really large network. Class A network and due to security reasons broadcast and any other PING has been blocked. I want to get all the PC IP that are alive. Is there any way to query DHCP ...
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2answers
280 views

how to Centrally manage multiple IP's for machines single Nics

We are a web dev shop and all use laptops and at the moment use static IP's. Each machine has one NIC but we need multiple IP's to deal with the multiple IIS Sites we have. The more machines / users ...
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2answers
2k views

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 ...
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1answer
63 views

Using dhcpd hosting web site fedora?

how do we host a web site for small group located across country on dhcpd ipaddress, we have fedora install server with httpd config on right now we can use that web site only on same network. If we ...
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1answer
2k views

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 ...
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1answer
7k views

Windows 7 Failing Ping on IPv6 in DHCP Setup

I have set up a test ISC DHCP server that is not connected to an internet with DHCP and DHCPv6. I also have a Cisco 3750G with IPv6 enabled. I have firewalls off on both machines. My Windows 7 ...
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4answers
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Linux: disallowing access to a network when the user has a static-defined IP address

In my network I run dhcpd3 set up to assign IP addresses only to specific MAC addresses. It works wonderfully, I even integrated it with bind9 to automatically create direct and reverse DNS hostnames ...
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1k views

How to run multiple instances of dhcpd or add/remote listen interfaces at runtime?

The same network interfaces interfaces in my laptop (eth1, wifi0, br0) are often connected to different networks (home/work/university network, virtual network with Virtualbox, ad-hoc network with my ...
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1answer
842 views

dhcpd: How to tell how many leases are available?

I'm a little bit new to dhcpd. I'm trying to figure out how many leases we have available on our network. The /var/lib/dhcpd/dhcpd.leases file appears to show almost a history of leases and some of ...
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1answer
2k views

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 ...