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1
vote
0answers
30 views

One server has multiple IP address leases but just one adapter and no dhcp reservations?

One of our servers' has multiple (10) DHCP Addressleases and I don't know why. The server itself has only one adapter and even if I execute ipconfig /all I only see one IP address defined. Even in the ...
2
votes
1answer
146 views

How to find out IP address held by a Windows DHCP client yesterday?

We have a Windows Server 2008 with DHCP server running. I can see the current leases and reservations, is there a way to see the status of yesterday (or at least what IP a particular client had ...
2
votes
0answers
37 views

DHCPD does not allow filename option with a colon in it

For some reason, tftpboot does not work with a colon in filename parameter: group { filename "node7:linux/pxelinux.0"; host machine_7a { hardware ethernet 02:01:02:02:01:11; ...
-1
votes
2answers
31 views

how to get a connection between Windows and Linux without an existing DHCP server

Scenario: In general a ubuntu machine (called server) runs in a network and gets an IP from it. Due to testing, sometimes a windows machine (client) is physical connected to the ubuntu machine ...
-4
votes
2answers
45 views

How to force the network machines to get the ip from a DHCP server? [closed]

How can I force all the network machines to get the IP from the DHCP server and prevent them from manually editing the network configuration. There are both Linux and Windows machines. The DHCP server ...
-2
votes
0answers
38 views

DHCP server configuration on ubuntu 14.4

so this is my configuration on ubuntu server 14.4 for DHCP server in interface file auto lo inface lo inet loopback auto eth0 iface eth0 inet static adderss 192.168.1.1 netmask 255.255.255.0 ...
0
votes
1answer
47 views

VSS DHCP Jet Writer Experiences Errors During Backup with WBADMIN

Summary My standalone physical server is running Server 2012 R2 Foundation. Two separate backup schedules exist, both using Windows Server Backup. I'm getting VSS errors from the DHCP Jet Writer ...
0
votes
1answer
38 views

Windows Server DHCP import/export scopes using netsh.exe

We have Windows Server 2008R2 as domain controller with DHCP Server functionality. Task was to make reserve server on remote site in case of failure of main one. The reserve one will be running ...
13
votes
2answers
2k views

What are the possible issues in using very short DHCP lease time (< 1min)?

We have a network setup for a demo, which lasts about 15mn. Our DHCP server is configured to assign ~ 100 addresses (max number of simultaneous connections or our AP) ... but since people might come ...
4
votes
2answers
162 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 ...
1
vote
0answers
41 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
votes
1answer
93 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
142 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 ...
0
votes
1answer
46 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
vote
0answers
82 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 ...
1
vote
0answers
39 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 ...
0
votes
1answer
53 views

How to trigger DHCP request and inspect the reply from DHCP server

Is it possible to trigger a DHCP request from my DHCP server and then sniff and inspect the whole DHCP reply from the server to see what options/parameters it sends to the clients?
0
votes
2answers
498 views

is it possible to run bootp/pxe server using dnsmasq without act as dhcp server

on my network its already exist a router that do dhcp, boot in this network i need to boot a diskless system that use pxe to boot from network, while the pxe server is using dnsmasq to serve O/S, but ...
2
votes
0answers
136 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 ...
-1
votes
1answer
73 views

Cisco Router not displaying DHCP client hostnames

I've got a branch office configured to issue IP address from a Cisco Router (IOS 15.0). The router is successfully issuing DHCP addresses just fine. My questions is that when I issue the command "sh ...
0
votes
0answers
21 views

Empty declaration

Someone gave an answer about an unfunctional DHCP server. He said: "Create an empty declaration for your 10.4.1.0/24 network". subnet 10.4.1.0 netmask 255.255.255.0 { } What exactly is an EMPTY ...
2
votes
1answer
72 views

set unlimited lease duration throuth CMD

On Windows Server 2008 (R2, 32-Bit, I found the following way to set the lease duration for, say, 3600 Seconds (1 Hour). netsh dhcp server scope 10.0.0.0 set optionvalue 51 DWORD 3600 [→ source] ...
0
votes
1answer
74 views

Ubuntu server dhcp reservation not working

I need some suggestion, if possible, about a dhcp server and ip address reservation. The system is a Ubuntu server 12.04 LTS. The DHCP is ISC DHCPd version 4.1. This is the /etc/dhcp/dhcpd.conf ...
0
votes
2answers
100 views

DHCPD assigning wrong DNS server

I just installed two Ubuntu 14.04LTS servers. The first one I installed bind9 and isc-dhcp-server on. The second one was left as installed to use DHCP. I created a new private network using VMware ...
1
vote
0answers
307 views

DHCP offer is unicast but DHCPACK is broadcast

My DHCP server broadcast DHCPACK 0xffffffff . it is not working on layer 3 dhcp relay agent . as it can not forward this broadcast message to my client. can any one help me from exactly the broadcast ...
3
votes
2answers
574 views

Assign fixed IP address via DHCP by DNS lookup

Preface I'm building a virtualization environment with Ubuntu 14.04 and LXC. I don't want to write my own template since the upgrade from 12.04 to 14.04 has shown that backwards compatibility is not ...
0
votes
3answers
598 views

Superscope DHCP leases and configuration set up

Hello I wanted to see if someone could help with a network problem I am having. Right now we have a super-scope and scopes of 192.168.50.1 and 192.168.51.1, as of now both are activated but only ...
0
votes
2answers
47 views

Notification of low DHCP pool in split scope setup

In Windows Server 2008 R2, it is possible to read the Event Viewer for EventID 1020 which is an indication that the DHCP pool is running low on addresses. What if I have two DHCP servers in my domain ...
0
votes
3answers
360 views

Fixed dhcp host to automatically expire any lease

I have the following situation: Multiple offices with multiple firewall/dhcp servers. Every time the IT team of some office plugs a new network printer i need to create a fixed-address entry, and ...
2
votes
0answers
630 views

DHCP Server Not Offering to PXE Client

DHCP Server Not Offering to PXE Client BACKGROUND: I'm in the process of adding PXE services to an existing SCCM 2007 server. The SCCM server is separate from the DHCP server (Server 2008 x86) and ...
2
votes
1answer
181 views

Use Windows Server 2012 R2 IPAM Role to Manage a DHCP Cluster

My Google-fu is failing me today. I would like to blame the bad office coffee, the fact that it is a Monday, and the lack of information online...but maybe it is my fault. Either way, I hope that you ...
1
vote
2answers
190 views

Intermittently unable to connect to specific URLs

I have a simple and typical network configuration consisting of an ISP-provided cable modem connected through a SonicWALL router/firewall to a single switch that has been operating flawlessly for ...
1
vote
1answer
143 views

Is there a limit to the number of DHCP scopes I can have?

Some context: Currently all devices in our remote sites are setup on 1 VLAN. We have 400 remote sites. A project wants to split our sites into multiple VLAN's which on the whole seems like a good ...
2
votes
1answer
211 views

DHCP Warning Sign Icon On Windows Server

I have a Windows Server 2008 R2 SP1 Domain Controller. I have the roles AD, DHCP, and DNS installed on this server. I noticed today that there was a warning sign on my IPv4 setting, but not on my IPv6 ...
0
votes
2answers
78 views

Multiple DHCP servers [duplicate]

In what circumstances should you configure multiple DHCP servers on the same subnet? My understanding of using more than one DHCP server is that your clients will use the nearest DHCP which could be ...
-2
votes
1answer
59 views

domain-search value on my clients computer [closed]

I need help with configure my DNS and DHCP server - I have spent some time searching on google but have not got any informations regarding my problem. I have an Ubuntu 12.04 server running and use ...
3
votes
1answer
2k views

Move DHCP Scopes to existing DHCP Server

We have a remote Domain Controller that is running Server 03'. I'm wanting to retire this box and move to the 03' box that we have locally. I was looking at this guide, but wanted to ensure that it ...
1
vote
1answer
150 views

Can Windows Server 2003 DHCP Server assign multiple IP Addresses to a single host?

I have Windows 2003 Server handling DHCP for our network. We use reservations to assign some hosts IP addresses. Is it possible for the server to assign a single host two IP addresses in different ...
0
votes
1answer
47 views

DHCPD: permanently leased IP being offered (twice) to random node and assignee

Greeting. On a small LAN (< 20 networked devices) with a cento6 5.9 server/dhcp-3.0.5-33.el5_9). I am configuring permanent leases thusly (dhcpd.conf, partial): range 10.115.64.60 ...
3
votes
1answer
116 views

ISC DHCPD memory leak solutions and or workarounds

Background: I have recently been put in charge of finding the root of and/or fixing a memory leak with an ISC DHCPD (4.2.5-P1) installation on a Debian (Lenny) Unix server. I have been researching ...
-1
votes
1answer
112 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 ...
-1
votes
1answer
153 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 ...
0
votes
0answers
10 views

ubuntu not restarting after uninstalling dhcp3 client

I have uninstalled dhcp3-client using the command aptitude remove dhcp3-client dhcp3 common And I restart the ubnutu. But the box is not coming up. It has become a big problem now as i have lots ...
0
votes
0answers
39 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 ...
0
votes
0answers
94 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
votes
2answers
298 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 ...
2
votes
2answers
326 views

Removing DHCP role, cleaning up AD data

Back story. So we had a development engineer (who just happened to have access to a domain admin account) who set up a handful of DHCP servers on our domain. This caused headaches, as the new DHCP ...
13
votes
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 ...
1
vote
0answers
420 views

dhcping “no answer” on CentOS 6.4

I installed a DHCP server (yum install dhcp) and this is my conf: # create new # specify domain name option domain-name "mydomain.name"; # specify DNS's hostname or IP address option ...
-3
votes
3answers
250 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 ...