Dynamic Host Configuration Protocol (DHCP)

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2
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2answers
2k 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 ...
14
votes
4answers
4k 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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0answers
2k 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 domain-name-...
-3
votes
3answers
388 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 ...
0
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2answers
205 views

Wireless Clients unable to connect to internet

Our small office network consists of 2 windows 2008 servers, and 14 workstations (8 running windows 7 and 6 running windows xp) and 1 router(wired/wireless). The main server has DHCP, DNS, Active ...
1
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1answer
162 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 ...
-1
votes
1answer
144 views

Create separate Network for testing purpose [closed]

I have installed Windows Server 2012 on a VM (ESXi) for testing/learning purpose and I also like to install DHCP Server as well but this will conflict with my ISP router and I don't want to disable ...
1
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1answer
132 views

DHCP server not assigning IPs - Linux (CentOS)

I am having a main issue with the DHCP server. It is not assigning IPs and the dhcp.leases file is increasing in size as it is logging multiple entries for same IP. Started and stopped the service ...
0
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1answer
34 views

Linux dhcp server for wlan/wired

I want to configure my dhcp server on a debian router which uses different ip range based on the type of user connection; wlan or wired. The wlan is set in bridge mode! Since it is a public net I don'...
0
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3answers
445 views

Linux DHCP Server Migration

Background I'm moving 2 existing Linux DHCP servers to a new network. The servers currently configured as follows: shared-network network { #new network subnet 192.168.100.0 ...
2
votes
1answer
821 views

DHCP Server Issuing NAK when servicing multiple subnets

We currently have 3 VLANs setup in our network. On our DHCP server (Windows 2008) we have 3 scopes created for the 3 separate subnets. Our clients can't seem to pull addresses on the subnets, except ...
1
vote
1answer
184 views

Server 2003 DHCP Server with Low-Access user account

I'm trying to run the DHCP Server service under a low-permissions account (partly to reduce attack-vectors, and partly just for kicks), as it runs under LOCAL SYSTEM by default. I've successfully ...
2
votes
2answers
212 views

DHCP/static IP nomenclature

I've just inherited systems administration for a small network, on which we have exclusive access to the first 128 IPs on a private virtual subnet. We have a DHCP server which binds IP addresses to ...
1
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1answer
341 views

HyperV Migration and DHCP Reservation

In my company network we've 2 HyperV-2012 host with DAS, every server has a DHCP reservation in the DHCP server (windows server 2008). Yesterday we've migrated (using shared with nothing migration) ...
4
votes
2answers
672 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 ...
1
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2answers
249 views

IP Address shortage/Subnetting

Facing a problem where we are running out of available network addreses, we are currently on bog standard 192.168.1.x range. Reading about making more ips available and subnets and think i have just ...
1
vote
4answers
8k views

Computer gets IP from DHCP server but has no internet connection

I've installed an isc-dhcp-server on Ubuntu 12.10 and I'm trying to setup a DHCP server on a head node for six worker computers in the local network. The head node itself is a DHCP client receiving ...
0
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1answer
69 views

dhcpd not responding to request from MAC already in the lease

My dhcp server on linux machine has a specific host declaration for MAC within one subnet. When my other machine boot up over network using PXE, it receives the right IP address. However this dhcp ...
1
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2answers
1k views

Need to prevent SBS 2003 disabling its DHCP server if it sees another DHCP server on network

The DHCP server on our SBS 2003 server shuts itself down automatically after a couple of hours of having a Hamachi gateway running on the same LAN. The server incorrectly assumes that Hamachi ...
0
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0answers
174 views

Is it possible to prevent DHCP service on SBS 2003 from shutting down due to rogue DHCP server?

We are using LogMeIn Hamachi to link two remote sites together by VPN. This is working perfectly, the only problem is that the DHCP service on our SBS 2003 server shuts itself down after an hour or ...
4
votes
1answer
604 views

Running pfSense server after load balancer, dhcp?

I got the following situation: Two wan, load balanced by a hardware load balancing router Wifi network (can be up to twenty AP's) And I need the following: Need a captive portal where clients ...
1
vote
1answer
329 views

Command Equivalent to Reseating a Network Cable

I'm remotely accessing a network where I'm testing two separate dhcp servers where: 1) Both dhcp servers are on the same subnet. 2) The dhcp servers do not have overlapping ip pools. 3) Each dhcp ...
2
votes
1answer
308 views

Cannot assign IP address according to an option parameter

I have this DHCP conf file: authoritative; option domain-name "XXX.XXX.XX"; allow bootp; ddns-update-style ad-hoc; class "karpuz-kabugu" { match if (substring (option user-class, 0, 6) = "karpuz")...
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1answer
208 views

Access Control Lists & DHCP

Please take a look at this image right here. In the image above you can see a virtual netwerk simulation program (CISCO Packet Tracer 6.0) where I'm trying to setup a network and secure it. However ...
4
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1answer
914 views

DHCP scope for a user class option

In Linux how can I set a DHCP server configuration which will lease IP addresses from scopes which are defined according to user classes. For example the following configuration leases IP addresses ...
0
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0answers
373 views

Windows DHCP server not sending all options

I'm facing a strange problem with Windows Server 2003 and its DHCP server. Here is my scope and its related options. However when I look at the traffic using Wireshark, here is what the server is ...
1
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1answer
74 views

DHCP server as Linux and client as Windows

I have ubuntu installed machine and setup a DHCP server on it. Now I want to use this DHCP server as all for my windows clients. I tried a lot but failed. Right now Windows client machine uses router'...
0
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1answer
142 views

Forwarding all HTTP/HTTPS traffic to a port with iptables

I'm trying to setup a wireless network that routes all traffic to a local webserver (basically a hotel wifi login page). Here's my dhcpd config: $ cat /etc/dhcpd.conf ddns-update-style none; default-...
2
votes
2answers
691 views

windows server 2008 DHCP ran out of IP addresses

I have a Windows 2008 server with 1 DHCP Scope 10.0.0.X/255.255.255.0 and watchguard firebox for my internet router. I have run out of IP addresses. I added a second scope to my DHCP server, and I ...
2
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4answers
3k views

Is a short DHCP lease from my ISP likely to cause problems?

I'm wondering if having a short DHCP lease is likely to cause any issues, such as: Dropped VoIP calls Dropped VPN connections If so, could you explain why?
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2answers
3k views

DHCP Post-Install configuration wizard hangs

I'm attempting to set up a Windows 2012 Active Directory demo environment on a Hyper-V VM, but when I run the DHCP Post-Install configuration wizard to authorize the DHCP server in AD DS, the wizard ...
1
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1answer
10k views

Setting up routing in CentOS 6.4 as a router/DHCP server with two nics

I am stumped about how to setup centOS 6.4 to route packets. |Local Network| -eth0- |CentOS 6.4 box| -eth1- |Internet| The centOS box has a dhcp server running. Currently it is handing out IP ...
0
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1answer
1k views

VSphere 5.1 DHCP Server VM routing

I am trying to setup the routing for a VM that is my firewall/dhcp server. I have 3 VMs: router/firewall (centOS) -> VM1 unRAID(unraid) -> VM2 download-server(ubuntu server) -> VM3 2 NICs vmnic0 ...
4
votes
1answer
1k 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 ...
0
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1answer
4k views

deny unknown-clients dhcpd.conf

I'm having troubles figuring out how to set up my dhcpd.conf. I am rather new to this. I want to allow booting and only allow the clients listed below to get their fixed address. I do not know how to ...
-1
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1answer
118 views

DHCP messages in LAN [closed]

I run a Mac and release/renew my IP with: sudo ipconfig set en0 DHCP In wireshark I get the following with udp.port==67 as filter: Why are the messages sent from my computer broadcasted, but ...
1
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1answer
537 views

How to override the network DHCP Server settings to be specific to my own .conf file?

Basically, I have want to test out WPAD(Web Proxy Autodiscovery Protocol ) , PAC. But I would like to do it without touching the Network DHCP server. So, can you suggest a way in which I can achieve ...
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0answers
150 views

DHCP Requests out of line with lease time, inordinate amount of requests to server

Environment contains an OS X 10.6.8 Server with OS X 10.8.2 clients. DHCP is running on server with a lease time of 1 Day (86400 seconds). The system log is flooded with DHCP REQUEST/ACH messages ...
0
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1answer
4k views

Cannot find the DHCP Server

The network was fine yesterday and as far as I know nothing has been changed or added. This morning some computers are connected to our domain but most of them are reporting limited connectivity. On ...
-1
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1answer
4k views

Windows Server 2012 AD DC/DNS/DHCP in single server

I have to say I am not a system admin but I had to setup the development environment in my company and I ran into many issues and after searching for many hours I hope somebody can help me out here! ...
2
votes
1answer
63 views

Changing DHCPv6 server

I have a DHCPv6 daemon that is answering for requests of some machines and everything is working fine. So I decided to remove this DHCPv6 daemon e start another daemon on another server, but the ...
0
votes
2answers
248 views

Set up DNS and DHCP roles on Win 2008 server. Why don't clients show up in Explorer?

I disabled the DNS/DHCP on my router and activated those services on a Windows 2008 server. Everything is working fine, but when I go to browse the network none of the machines can see any other ...
1
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1answer
158 views

Can I run 2 dhcp servers when I use predefined host entries?

I have a very specific setup of servers which netboot off a san. All of them provide identical functionality. There are no other machines in this netblock. Each machine boots from an iscsi image ...
0
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2answers
90 views

Assign IP range per switch?

Is it possible to handout IP ranges per switch with the use of one DHCP server? Example, i have 2 Swicthes (A & B). I like to: switch a => 192.168.1.50 - 192.168.1.75 switch b => 192.168.1....
2
votes
2answers
77 views

Why is a computer on my network not resolving correctly?

I am running Windows 2003 Server with Active Directory and DHCP enabled. the machine: laptop1 receives the IP: 10.2.6.134 from the Windows 2003 DHCP Server. the machine name and IP does not show up ...
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3answers
522 views

No route to host after changing interface to static ip [closed]

I installed a Linux (Ubuntu) server inside my home LAN, initially it's automatically configured to use DHCP interface. I'm connecting to this server from another computer using that server's hostname. ...
1
vote
1answer
2k views

Vyatta: how do I view up fixed DHCP leases settings?

I'd like to know how could I get the MAC-IP DHCP associations. I know that there is show dhcp leases but it only shows information about the active leases.
0
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1answer
655 views

Running a dhcp server on windows 7 ultimate

I'm trying to get my HP T5740 thin clients to connect to my local network without much success. I asked a question here but haven't got any response. I think that question should have been posted on ...
4
votes
1answer
6k views

Can not authorize DHCP server

I have run into a strange DHCP problem. The thing is the service is running, but the DHCP is not authorized. However, when I try to do it by right clicking, the option to authorize is not there - I ...
2
votes
1answer
1k 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 ...