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
819 views

Automatic subdomain wildcard for DHCP-DDNS additions?

I'm running dhcp-4.0.2 server and bind-9.6.1-P3. When a new Mac OSX DHCP client with the name "harry" connects to the network, the DHCP server gives it a lease, and adds appropriate A & PTR ...
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1answer
1k views

Retrieving kickstart and other .img file in pxe remote installation in CentOS

I am trying to installation CentOS through pxe tftp installation. Installation starts but it fails to download image files from the http server. but file are accessible on the http server. Logs from ...
2
votes
1answer
2k views

Understanding DHCPv6 Stateful Solicit message

I have been reading the full RFC 3315 and trying to generated spoofed nodes to ask for IPv6 address. (only for practice) Right now, I have a Ubuntu with wide-dhcpv6-server (the DHCPv6 server), one ...
2
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4answers
2k views

Windows DHCP Server Priority

How can I set the priority of DHCP servers to get a lease from in windows (XP)?
0
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1answer
4k views

dhcpd, DISCOVER, “no free leases”

I am attempting to set up a VERY simple DHCP server. I am using Ubuntu 10.04, and I installed the "dhcp3-server" package. The server has one interface (eth0) statically set to 10.0.0.10(/21). I want ...
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2answers
9k views

What do DHCP Lease Time and Domain Name do?

Why do we need to set a lease time to a DHCP server? What happens to a client who uses that IP address while it was expired? If i set its time to 100 years, what difference does it make? Also, i ...
1
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1answer
78 views

How to Lease a DHCP IP Address for X Number Of Days in Windows 2003 Machine

I have a numerous set of windows servers. The requirement of Fixed DHCP IP Address may vary for each server. One IT Guy may ask like i need this DHCP Address for 30 days and another may say i need it ...
5
votes
1answer
760 views

Dealing with iPad DHCP Issue

According to Princeton University, the iPad (and perhaps other iOS devices?) seems to have had various issues with DHCP that exist even on the current version (4.3.3). The current one involves the ...
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votes
1answer
275 views

Cisco RV082 ip conflicts within the router config, I am using a DHCP server configuration

I have an issue with my Cisco RV082 Dual WAN Small Business Router. Firmware version: v4.0.4.02-tm I am having ip conflicts within the router config, I am using a DHCP server configuration with the ...
5
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6answers
23k views

What is a good DHCP lease timeout configuration

I have generally seen that DHCP lease times are quite long (a day plus) on most defaults. I have a client that seems to have the following problem. They have a DHCP server in a router that is ...
2
votes
1answer
771 views

When does ISC dhcpd expire leases

When exactly does ISC dhcpd forget a lease that is not explicitly freed by the client? Context: I am running an installation with many small pools (3 address) and it does not seem to cope well when ...
3
votes
2answers
2k views

dhcpd.leases file manually edit

I have OpenBSD 4.8 serving as Gateway & DHCP Server. By mistake, when reinstalling one of the workstations (it is Windows 7) it gets the same name as it was before (i.e workstation-PC). So now I ...
0
votes
1answer
35 views

Excessive DNS Update requests

I have a curious situation and I can't find any good reason why its happening. Its not causing any noticeable problems, just something I'd like to resolve. From my Server12 dhcp logs, these entries ...
2
votes
2answers
125 views

DHCP options “not user configurable”

I'm using dhcp on both client and server on Linux machine I would like to "force" some dhcp options from the dhcp server to the dhcp client Specifically I'd like the client to set into his lease ...
0
votes
1answer
164 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 ...
2
votes
2answers
15k views

Domain connection shows as “unauthenticated”

I have seen various different questions for this problem floating around but either the circumstances arent the same or the solution doesnt work so thought i would post it to see if anybody has any ...
0
votes
1answer
26 views

How do I properly configure host server net adapters when using Hyper-V?

I am converting a number of physical servers to virtual ones, and I have a question regarding configuring the physical adapters on the host server. I am new to virtual machines, and have a nagging ...
0
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0answers
8 views

Could not start DHCP client on windows 7 home premium. Error 5 access denied [migrated]

DHCP client didn't start automatic. Trying start from services: Windows could not start the DHCP Client service on Local Computer. Error 5: Access denied. What should be fixed please?
0
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1answer
59 views

How can I block all traffic to/from an bridged interface while allowing DHCP?

I have a PC (running Fedora 20) that is being used as a "software switch" to control the network connectivity of some external devices. There are eight such devices; the PC has two 4-port Ethernet ...
6
votes
6answers
9k views

Why can Windows machines resolve local names when Linux can't?

I have a small network with Windows and Linux machines connected to a D-Link DIR-825 router. The Windows machines on the network can reach all other machines by name while the Linux machines only can ...
1
vote
1answer
3k views

Issue with RHEL7 and disabling NetworkManager

Okay community, let's see if we can figure this one out, cause I'm out of answers. Where I work I am setting up a bunch of RedHat Enterprise Linux servers. There is a collection of RHEL6 and RHEL7 ...
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3answers
749 views

Assign a secondary IP address to a Windows machine using DHCP

Is it possible to configure dhcpd (on a Linux box) to assign a Windows PC 2 separate IP configurations? Right now I've configured the two IP addresses manually and it does exactly what's needed, but ...
0
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0answers
6 views

What to consider when putting a router inside of another network, not controlled by me? [migrated]

this question is a question from an users point of view, and a noob regarding network technology. I am living in an appartement block, where the internet is routed central (lets call it that way). ...
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vote
2answers
2k views

Juniper SSG5 DHCP IP Pool is full. Unable to offer IP address to client

hope we have some Juniper guys around, I have configured a Juniper SSG5 as our main firewall/router the DHCP server set on interface bgroup1 to have a rang from 10.10.10.76 to 10.10.10.210 All ...
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2answers
1k views

CentOS 7 is not setting my gateway from DHCP

I have a Minimal Install of CentOS 7. I have disabled the Network Manager as I want to setup my network the "old school" way. systemctl stop NetworkManager systemctl disable NetworkManager ...
0
votes
1answer
1k views

How could I fix “No subnet declaration for restart (0.0.0.0)”?

I have a DHCP service installed on my distribution, Backtrack 5 R2 (ubuntu 10.04) and it was working fine, but when I began to configure DNS it suddenly stoped working, how can I make it work again?? ...
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0answers
29 views

How can I implement DHCP so that all users on a domain can get one pool of addresses and the rest get another?

For example, having the domain users/machines on the 192.168.22.x subnet and the rest of the non-domain users and machines are on say, the 192.168.30.x subnet. I'm running Windows Server 2008 and the ...
1
vote
1answer
2k views

ISC DHCP fails to sync leases between peers

I use ISC DHCP version 4.1.1 on Debian GNU/Linux on both servers. I tried to solve the following problem using various versions of ISC DHCP but it remained the same. My configuration for failover ...
2
votes
1answer
32 views

How to make BSDP NetBoot image selection from a script on OS X 10.9+?

Background: BSDP is Apple's protocol used to discover and make selections on NetBoot servers on the network (Not to be confused with PC-style PXE boot). specs (Word doc). Long story short - it's a ...
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votes
5answers
129 views

What happens if ISPs mess up IP allocation?

I've been wondering about this for a long time but never really got around to asking it. I know that a lot of companies were initially assigned IP addresses within the /8 (Class A) range and a lot ...
4
votes
1answer
404 views

HP Procurve 2920 VLANs with DHCP cannot ping

I have problem setting up working VLANs and DHCP server on HP Procurve 2920. My problem is that I cannot even ping computers between VLANs with static ip addresees. winXP pc on VLAN101 with ...
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3answers
862 views

Linux server not receiving default IPv6 route over PPP link

I'm replacing a pfSense router in a remote office with a small linux device, running Debian. The router only has to handle very basic iptables / DHCP and VPN facilities. It is configured so that the ...
0
votes
1answer
1k views

Disable LDAP service in CentOS 6.3

What command needed to disable LDAP service in CentOS 6.3. I tried: authconfig --disableldap but it doesn't work. I am trying to run ISC-DHCP in my machine but it always shows Not searching ...
4
votes
2answers
239 views

Can a PXE+DHCP server exist on one network and boot machines on another?

I have a PXE+DHCP server creaed using syslinux and already running on a private network segment (198.19.99.xxx).. I want to know if this PXE+DHCP server can be configured to boot machines over another ...
4
votes
4answers
10k views

DHCP failing to update DNS

We have a Windows Server 2003 SP2 machine that is a domain controller, DNS server, and DHCP server. (We realize that having all three roles running on the same computer is not the optimal ...
-1
votes
1answer
225 views

How to configure PXE/Tftp in dhcp.conf on vmware Fusion 7 Pro with static reservations

I'm senior devops engineer with a deployment system to ship a couple thousand linux machines a week. I'm using vmware fusion 7 pro to do this, and I'm having a little trouble with pxe booting. I ran ...
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0answers
35 views

ipv6 address assignment via local server from isp assigned block

I have been looking around and found the information confusing as best. Is there a way to have a server "recieve" the /64 ipv6 block from the isp and then use dhcp or something to assign it out to ...
0
votes
2answers
1k views

Cisco WLAN Controller not pushing out DHCP addresses, what else could it be?

On our Cisco WLAN Controller web interfaces, in Controller > Interfaces, I have made a new interface with these settings: VLAN Identifier 202 IP Address 172.16.202.1 Netmask 255.255.255.0 Gateway ...
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1answer
1k views

Client see Windows Deployment Services but still get “selected boot device failed” error

Like the title says I can't Windows Deployment Services working. The client laptop has an ethernet IP address of 10.0.4.94. On the secondary DHCP server I've set option 60 to PXEClient, option 66 to ...
2
votes
1answer
159 views

How can i prevent TINC from relaying DHCP

I am running tinc in several NAT routers running Debian 7 Wheezy, the VPN works fine for months, except because i've set it up in switch mode it relays DHCP requests and answers over all the VPN. The ...
11
votes
2answers
5k views

PXE Booting Virtualbox guests in internal networking mode?

I am not sure if this is just specific to my distro's packages or is a vbox limitation. So, any help would be appreciated. Ok, so I have a network of VMs, with one VM acting as a NAT for the other ...
0
votes
1answer
56 views

adding more IP's to my DHCP scope

Our DHCP server is running out of addresses in its range. How can I increase the range? We have Windows Server 2008r2 as a DC\DNS\DHCP server. current scope range 10.220.120.1 - 10.220.120.254 ...
1
vote
1answer
126 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 ...
2
votes
4answers
842 views

Why use DHCPv6 over Stateless Address Autoconfiguration?

IPv6 and RFC 2462 provide a means for hosts to configure their own IP addresses via stateless address autoconfiguration. To me this seems like the bee's knees, and it leaves me wondering why someone ...
2
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0answers
120 views

DHCP fault tolerant servers: Split pool or failover?

I need to replace an aging DHCP server by a fault tolerant solution. I consider using the ISC dhcp server solution which can be setup either as split servers serving non-overlapping ip ranges or as a ...
0
votes
1answer
88 views

qemu, kvm: Guest: No DHCPOFFERS received

I'm trying to set up a virtual machine (guest) wich should act as router (ubntu 14.04). The host is a CentOS 7 machine (4x LAN). The guest should get a public ip address over it's eth0 (guest), wich ...
0
votes
1answer
9k views

starting dhcpd failed (Centos)

i have a issue related to dhcp i have configured my dhcp according to my ip and all ... but it fails. when i try to start the service... i tried to trouble shoot and i stopped the firewall ...
4
votes
1answer
800 views

Incorrect lease times from Windows 2012 R2 DHCP

Env: Two Windows 2012 R2 DHCP servers in active/passive (hot standby) mode serving one scope. Scope lease duration: 1 day. MCLT: 1 hour. Situation: New dhcp client gets IP configuration with a ...
0
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0answers
25 views

DHCP Requests cannot get through Switch

First a little about the network setup: We are a smaller department of a larger school. We have 7 offices with TP-Link managed switches as well as 20 APs and 24 classrooms. The switches, APs and ...
11
votes
1answer
4k views

How to request dhcp (using dhclient) on a virtual interface (i.e. eth0:1)

This seems to work fine: dhclient eth0 ifconfig eth0:1 192.168.1.105 up But not this: ifconfig eth0 192.168.1.105 up dhclient eth0:1 Is there any way to get dhcp on a virtual address?