Dynamic Host Configuration Protocol (DHCP)

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35 views

Android dhcp assigning bogus dns server

I've been having problems with Android devices and DNS lookups on my WiFi network, so I've done some digging and found that android is assigning what appears to be a random link-local ipv6 address in ...
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1answer
95 views

XenServer 6.2 DHCP Setup

I have a XenServer 6.2 running on a dedicated OVH Server. For this dedicated server I have 2 additional IP blocks. Whenever I setup a new VM (mostly CentOS 6.6) i have to skip the network ...
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1answer
36 views

DHCP with fixed IP hosts (Ubuntu)

I'm managing an office system that assigns IPs based on the MAC address. The fixed hosts are added in a dhcpd-hosts.conf file which is included in dhcpd.conf. There are some PCs that are not in the ...
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1answer
1k 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 ...
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2answers
55 views

DHCP server on subinterfaces

I have created two subinterfaces on eth0 : eth0:0 with IP 192.168.10.1/24 eth0:1 with IP 192.168.11.1/24 Configured /etc/dhcp/dhcpd.conf like that: option domain-name-server 194.204.159.1; ...
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0answers
65 views

Windows 2012 DHCP ignores priority among server / range / class-policy / reservation options?

I am observing that the priority of DHCP settings in Windows 2012 DHCP server server options range options class options reservation options among which the ones listed later always override ...
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15 views

DHCP Config for Server 2012 R2

This question may have been covered before, but it is rather complex and haven't found a similar post, so please be kind! I think my issue is rather unique, so I'll try to explain as best I can. I'm ...
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1answer
15 views

How to use Server2012 as DHCP and on the same time Ubuntu Server as Gateway for the client Machines? [closed]

I want to use Windows Server 2012 R2 as a DHCP for the client computers with Ubuntu server acting as gateway to the internet. I am using VMWare WorkStation. Both machines are installed on it. Windows ...
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1answer
167 views

configure a dhcp server to serve two different scope on the same subnet with multiple interfaces

Ok, so here I am with a pretty complicated problem on a Debian Wheezy server I have three interfaces : eth0, eth1 and wlan0 on a single server, eth0 will act as a gateway for eth1 and wlan0, I have a ...
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1answer
37 views

Why are DHCP leases not included in DHCP Log?

Running Windows Server 2008r2. DHCP Logging is enabled (Server Manager, Roles, DHCP Server, , IPv4, Properties, General, Enable DHCP Audit Logging). In the DHCP event log (Event Viewer, Custom ...
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3answers
992 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 ...
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1answer
35 views

Is it possible to bring down a network with DHCP discover?

When a DHCP server receives a DHCP discover message it broadcasts the offer across the entire network. If a malicious machine joined a network and somehow began spamming DHCP discover messages, would ...
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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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1answer
55 views

calculate reserved ip address based on mac address

Is it possible to calculate ip address based on mac address for isc-dhcp server? For example: 'aa:aa:aa:aa:aa:x' => '10.10.10.x' I have following in dhcpd.conf: subnet 10.10.10.0 netmask ...
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0answers
92 views

2008R2 DHCP Server Becomes Unresponsive

At the end of 2013, our single Windows Server 2008R2 DHCP server started becoming unresponsive once every week or so. The server itself was up, but the DHCP server was unresponsive. Attempts to ...
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2answers
346 views

SCCM 2012 R2 OSD pxe-32 : tftp open timeout

I have SCCM 2012 R2 standalone primary site on windows server 2012 and i have Cisco dhcp server i configured the distribution point for pxe boot to work with osd i added boot images and configured ...
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3answers
950 views

Why does a DHCP server need a static IP address?

I'm experimenting various network setups using VMs. When I setup the DHCP role on Windows Server, it requires a static IP. I am having trouble understanding why this is necessary from a technical ...
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1answer
45 views

How to configure DHCPD server to bind static IPv6 address by DUID?

how can i configure the server to make static record DUID - IPv6 ? For example i have such DHCPv6 request: Client Identifier Option: Client Identifier (1) Length: 7 Value: 31303030303133 ...
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86 views

CentOS DHCP server supporting multiple subnets on a single NIC

I understand that what I am asking has been asked a million times already. I think I have read just about every post I can find on the subject yet I still cannot get this to work. I have a DHCP ...
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1answer
34 views

1-dhcp server for 2 separate network

Debian Server Setup (wheezy) 1 - eth0 - Connected to INTERNET 1 - eth1 - LAN 1 (Network 1 : 192.168.100.0/24) 1 - wlan0 - Access Point (Network 2 : 192.168.200.0/24) /etc/network/interfaces auto ...
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1answer
13 views

Change DHCP on server 2k3

Ok I am trying to mess with our dhcp settings on our domain server because at this point we kinda have competing dhcp servers between the router and the server. (Long predates me and I have finally ...
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0answers
33 views

dhcp relay with failover to local service

I'd like to set up a dhcp server which normally relays to a central site, but has a pool of addresses to hand out if the link to the central site goes down. I'm using isc dhcp server on Debian, but ...
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2answers
580 views

dhcpd pool exhaustion - What's the result?

I have a DHCP server that serves leases to several houndred, maybe up to a thousand, different clients on an average day. The pool consists of 242 IPs, and due to the highly dynamic nature of the ...
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34 views

Workstations connected to SBS 2011 can not connect to “http://connect/” and are getting frequently disconnected or kicked off of the shared drives

Small Office, there are 7 computers and a server running SBS 2011. 2 workstations are not currently bound to the server, because after recently reinstalling windows 7 on them, it was discovered that ...
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1answer
16 views

DHCP server with 2 NICd

I have windows 2012 r2 x64 standard server. That server has 2 NIC nic1 gather IP from LAN1 nic2 - here i need run dhcp for LAN2 (black network) This server will have firewall which will be use ...
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2answers
84 views

Duplicate MAC address, can be blocked?

Let's say we have DHCP server and provided MAC filtering system. Can we blocked the next spoofed MAC address? The next device will not be leased any IP address. Or normally it is already blocked by ...
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1answer
110 views

GPO to Configure DHCP Options

Our environment has approximately 15 Domain Controllers that also provide DHCP functionality to their networks. We have discovered several to have incorrect DNS settings. Their are providing incorrect ...
1
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1answer
86 views

Multiple DNS mappings for a host via DDNS

I have a network in which DNS is automatically updated with a record for hosts when they get an address via DHCP (isc-dhcp-server & Bind configured with DDNS updates). The DHCP server is ...
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5answers
3k views

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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1answer
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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2answers
87 views

SBS2011E + WS2012 + split-scope DHCP + site-to-site hardware VPN

Bit of a newb when it comes to this but I'm giving it a go and, so far, things work but I hope I'm doing it in a correct manner and a couple of little hiccups... HQ has a SBS2011E DC (DC1) that ...
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4answers
2k 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
929 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 ...
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1answer
208 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] ...
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1answer
245 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
130 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 ...
4
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1answer
955 views

DHCPREQUEST and DHCPACK spam in logs

I've recently noticed that my android phone (droid dna, although the thunderbolt that I had before did the same exact thing) is rapidly requesting dhcp info my dhcp server (isc-dhcp-server on debian ...
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1answer
126 views

How to “segregate” non-domain DHCP clients with Windows 2012 R2?

I search a way to prevent network access to devices not belonging to our corporate Active Directory domain. Some people connect their personnal laptops to our corporate network, and some of them ...
2
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1answer
64 views

2 client classes sharing the same subnet range

basically I would like to achieve the followings: using only one subnet different types of user sharing this subnets creating 2 pools accordingly an user class called "l2vpn_user" if matched by MAC ...
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1answer
226 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 ...
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0answers
56 views

How to associate a DHCP pool or subnet with declarations for a class

I have the following working configuration for ISC DHCP server 4.1.1, which hands out fixed addresses to registered clients. Some of those clients are configured for PXE booting (for FAI and SCCM). ...
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1answer
96 views

DHCPv6 Server IP address

I am new to DHCPv6. In dhcpv4 we have Option 54 to retrieve the Server Identifier (ie. Server IP address) in DHCP message. Similarly how to retrieve DHCPv6 Server IPv6 address in DHCPv6 Message. I ...
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1answer
1k views

Cant deploy images with WDS: PXE-E16: No offer received

I am currently playing around with a WDS lab environment on a virtual 2012 R2 server, which is patched to the latest available update-level. This server is running the DHCP server role and has two ...
2
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1answer
56 views

Are MAC ID passed via DHCP Relay

Do MAC ID pass through dhcp relay? Even if its connected on the WAN from the internet? So if the DHCP Server is on the WAN of the router and connected to a DHCP server on the internet is it passed?
2
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1answer
71 views

DHCP Relay behind two router

If i have a DHCP Server above two routers and a cleint computer below and the client computer is connected to a router with DHCP Relay, will dhcp pass through those two routers? Here is an example ...
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1answer
103 views

Backup and Restore DHCP

Today our Windows Server 2003 server is running DHCP to serve all clients with IP addresses. We have installed a new Windows Server 2012 R2. Now i want to move the DHCP from the 2003 server to the new ...
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0answers
595 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 ...
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4answers
921 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
348 views

Prefix Delegation and route creation

I'm using the ISC dhcp server version 4.1 for DHCPv6 prefix delegation on a network. When the server allocates a prefix to a client, the server does not create a route for that prefix to the client ...
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2answers
840 views

Windows Server set multiple Gateways and metrics

I would like to configure my DHCP Server (Windows Server 2008 R2) so that it assigns to each host two gateways. The client should use the gateway which is closer (less number of hops). I can do this ...