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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1answer
44 views

Multi Vlans with one DHCP server [on hold]

We have multiple vlans configured on Cisco 4506, two of them with dhcp enabled to serve living area inside our company and wireless. I installed a new DHCP on windows server 2008 r2 and planning to ...
0
votes
1answer
20 views

Ubuntu DHCP Server not assigning itself an address

I am setting up a virtual environment inside an ESXi server. I have a version of Ubuntu Server running isc dhcp. When the server boots up I issue the command ifdown eth0 followed by the ifup eth0. ...
0
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4answers
38 views

Misunderstanding of DHCP/DNS - What is the IP of a machine before DHCPOFFER/DHCPREQUEST

From what little I understand, DHCP allows for dynamic assignment of IP addresses to client machines on a network from a DHCP server. The client transmits a DHCPDISCOVER packet, followed by a ...
0
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0answers
13 views

Using Microsoft DHCP with Linux PXE/TFTP/kickstart

I have a microsoft dhcp server already in the network and i have linux servers for pxe/tftp/kickstart. I would think that it would work using a ms dchp server with pxe/tftp on linux but im not sure, ...
1
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0answers
19 views

Use Framed-IP-Address RADIUS attribute for IP allocation with DHCP on Windows Server 2012R2

I have configured a DHCP server on Windows Server with an NPS Policy, connected to a FreeRADIUS2 server running on pfSense. Authentication is based on MAC address. If MAC address is not present in ...
1
vote
1answer
29 views

DHCP Server Not Registering PTR Records

I've got a DHCP server that's configured to "Always dynamically update DNS records". Unfortunately, it's not doing its job. The client sends an Option 81 with its FQDN and all flags at 0. The ACK back ...
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votes
0answers
16 views

Access HTTP Server in the Same Subnet [closed]

I am trying to access http server running my laptop to my android mobile. But it's not accessible. But the server is accessible from other laptops. Firewall is open for the port 8080. Laptop Ip ...
0
votes
2answers
24 views

Linux Server Update Windows Server DNS (DHCP Not Windows)

I have Linux machines that are DHCP clients that have send hostname enabled but are not updating DNS on the Windows servers. DHCP is coming from the firewall, NOT Windows. Other windows machines ...
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votes
0answers
12 views

ESXi 5.5 - Management network with no gateway [migrated]

I'm setting up a test lab for VMware in Hyper-V. I have 3 vSwitches in Hyper-V: -EXT01 -INT01 -INT02 I've also created a W2K12 VM in Hyper-V which has the following roles installed: -AD/DNS -DHCP ...
1
vote
1answer
29 views

Internet bandwidth split with HP1810-8G, using “DSCP QoS policies” and VLANs

I have the following scenario: We are a small company (~10 clients) with little resources and we rented out office space to another company(<5 clients). We ordered a 20 Mbit fiber connection which ...
1
vote
1answer
37 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 ...
4
votes
2answers
59 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; ...
0
votes
1answer
39 views

lan to wan connection refused by windows firewall

I have plenty of experience with LAN's and bridges however this is my first time using a WAN style setup... here is a diagram of my network WAN (public ip & 10.1.10.1)---COMP1 (10.1.10.2) ...
0
votes
0answers
32 views

Router behind router [migrated]

To extend my wireless upstairs I salvaged a second router and have been trying to set it up so that: SSID matches with primary router Password matches with primary router Secondary router: Dlink ...
0
votes
0answers
16 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 ...
2
votes
0answers
60 views

DHCP Failover works but no DNS available

I have a DHCP failover (load balance) configured. DHCP failover works but the clients are not getting any DNS entries. We have 2 DNS servers using AD-integrated zones, and the failover is between ...
0
votes
3answers
38 views

Can the firewall prevent the DHCP to give an address, how to fix this?

I am not getting an IP in the subnet 10.0.0.0/24 where the DHCP is working and should serve an IP, I am getting instead only an IP in the subnet 169.254.0.0/16(link local address) that is probably ...
0
votes
0answers
17 views

DHCP, IP conflict on LAN (pfsense)

On my router I occasinally get a log with multible entries like this. It is a LAN with DHCP so I guess here should be no conflict at all... Is there a nature to this? May 11 09:24:36 220002 ...
3
votes
1answer
40 views

Reaching out DHCP relayed hosts

I have one primary server (DHCP) and one secondary (DHCP-RELAY). Majority of hosts are served from primary (wirelessly), however there are a few (wired ones) which get their IPs from secondary. ...
0
votes
0answers
30 views

Configure WiFi and LAN network to use the same Kerio DHCP server

We have a local network in the company: An Ubuntu server hosted for VPS. Kerio Control Appliance 8.5 installed on VPS as internet & DHCP server . WiFi modem connected to eth0 of Kerio. eth1 of ...
0
votes
0answers
22 views

Virtualbox vm lstp client login blank for lstp server on ubuntu 14.04 , what I'm missing here..?

I am trying to configure a lstp server ( ip of lstp server : 172.16.40.0 ) on a 64bit ubuntu 14.04 and check it network booting virtualbox vm (harddisk less vm) I configured everything according to ...
1
vote
1answer
38 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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votes
0answers
29 views

cisco ip helpder-address not working

I have 3 Cisco Catalyst switches: 2 3750 series and one 3550. The appear to suffer from the same problem. If I define a VLAN, configure a DHCP address assignment on it and then issue a command for it ...
1
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0answers
37 views

Android dhcp assigning bogus dns server [migrated]

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 ...
0
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0answers
33 views

How to configure DHCPv6 and DNSv6 configuration in Ubuntu 12.04?

I'm planning to configure DHCPv6 and DNS server in my network. I would like to understand whether both DHCPv4 and DHCPv6 can be configured using isc-dhcp-server service? When i tried nslookup ...
1
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0answers
15 views

How to set up a simple Cisco ISG config for controlling internet access

First off, here is my config so far. http://pastebin.com/fV2NGCE2 I've gone through a few guides online and the 15.2s manual and the xe3 manual for Cisco's ISG (intelligent services gateway) and ...
0
votes
1answer
25 views

How to move company voip phones to a different subnet by modifying DHCP of a Cisco Switch?

Our company has replaced its old voip phones with new ones which are the NEC phones. We are done with the configuration part, and the phones are working fine. But I want the phones to be in a ...
-1
votes
1answer
17 views

Why does starting openvpn client, then dhcpcd give different routing table than the reverse order? [closed]

I am connecting through a router in my home, and tunneling all traffic via openvpn through a remote server. When I first connect with dhcpcd, then start openvpn, my routes look like this (on a linux ...
0
votes
0answers
33 views

DHCP Server ignores DHCPDISCOVER request

Within a VPN I am trying to implement dhcp. I have the following setup now: DHCP Server (dnsmasq) is listening/should listen on a virtual network interface. The interface is configured as follows: $ ...
0
votes
1answer
63 views

Installing a new domain server on a small network without taking down the old one

I'm attempting to replace a windows server 2003 domain controller/dns/dhcp server on a small business network with a new machine running server 2012 without having to take down the old one until ...
2
votes
1answer
69 views

How to get the DHCP-controlled DNS domain name for my Ubuntu machines in a Windows network?

I've been going in circles for a while trying to figure this out. I have a number of Ubuntu machines (some virtual) on a Windows network. From a Windows machine, I can ping or nslookup the Ubuntu ...
0
votes
0answers
21 views

WES09 Client not registering with dns suffix

I have HP thin clients, some running Windows Embedded Standard 2009, and some running WES 7. They are all getting DHCP addresses from our Server 2012 R2 DHCP server, with AD integrated DNS. With both ...
0
votes
0answers
23 views

DHCP export using netsh

I'm trying to export a DHCP database using the following command: netsh dhcp server export c:\dhcpdb.dat all However it completes with the error WARNING: Could not obtain host information from ...
0
votes
0answers
40 views

Setting DHCP hostname with Cobbler

I have configured the DHCP to work with Cobbler in a way that the client will get its hostname assigned by DHCP (by using the option host-name in /etc/cobbler/dhcp.template). It works fine if I run ...
0
votes
0answers
23 views

Ubuntu DHCP-RELAY Error

I have a Ubuntu 14.04 server running as a router (4 NICs with IP forwarding turned on). The routing/forwarding component is working fine. However, I now wish to implement a DHCP-Relay/IP helper so I ...
0
votes
1answer
60 views

Custom Live Boot PXE ISO Script

Currently I am using an open source PC auditing software called Open-Audit to audit PCs my company receives off lease from school districts. The software uses snmap to pull hardware information over a ...
0
votes
1answer
46 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 ...
0
votes
0answers
46 views

Use export-smigserversetting vs. export-dhcp

Any reason to use one over the other (export-smigserversetting vs export-dhcp) when migrating DHCP from Server 2008 to server 2012 R2?
0
votes
1answer
34 views

Cisco Router DHCP Error Logging

I am troubleshooting an issue where a DHCP client is not receiving an address during PXE boot, but receives an address with no issues once booted into Windows. Our Cisco router is also our DHCP ...
0
votes
0answers
24 views

Hyper-V with DHCP enabled Host

I am trying to set up a Hyper-V enviroment. This is what I am trying to do : Install Server 2012 r2 on the machine as the HOST. Install DHCP, DNS and Hyper-V on the Host Machine. Using Hyper-V ...
0
votes
0answers
23 views

Unique record per ip address on Windows DNS

I have a little problem with my DNS server under Windows domain. My DNS server gets automatic registration from clients by dhcp. Please consider this situation: Computer PC01 with dhcp address ...
0
votes
2answers
54 views

Automatic DNS registration only for domain computer

I have a windows domain with a win server 2012 domain controller with dns service installed. In the DNS server there is the automatic DNS registration, is it possible to limit these registration only ...
0
votes
1answer
98 views

How to implement DHCP, DNS, hostnames on AWS VPC

This is what I THINK can happen and what I want. I create a VPC in Amazon, put a public subnet into it, put a puppet server instance and a full stack web server instance in the VPC. Now I set the ...
0
votes
0answers
57 views

Create IPv4 reservation with DUID in Windows Server 2012 DHCP

Can I configure reservations for IPv4 addresses in Windows Server 2012 DHCP for systems which send DHCP requests with a DUID for their client identifier (Option 61)? I have Linux (e.g., Fedora 21) ...
1
vote
1answer
149 views

Hyper V host not showing in dhcp server client table, but guest is

So I've got Hyper V running on windows 8.1. I configured an external virtual switch which uses my wifi physical card. So I get a virtual adapter that gets its ip from my dhcp server (e3000 router). ...
1
vote
1answer
231 views

Mac Host and VMware Fusion Bridged Networking Guest with Incorrect DHCP Client Identifier

System Info: I have four Apple Mac OS X Client host systems (running Yosemite, 10.10.2) bound to an Active Directory domain utilizing a Windows 2012r2 DHCP Server via ethernet - most cabled, one wifi. ...
0
votes
1answer
55 views

Why can I boot and install windows from a MS MDT server, using ISC for the dhcp server, but only under lageacy bios, not UEFI?

Setup is: Windows 2012 R2 with MDT 2013 Ubuntu Server 14.04.2 running ISC dhcp Client can be VM/Hardware doesn't matter. If I stay in legacy bios mode things work splendidly. When I switch to UEFI, ...
1
vote
0answers
93 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 ...
1
vote
1answer
255 views

Ubuntu 14.04 can only access outside networks if using DHCP, not static IPs

I am configuring some server on Ubuntu Server 14.04 (no GUI) and I am have the following configuration: auto lo iface lo inet loopback ## Management network eth0 auto eth0 iface eth0 inet static ...
0
votes
0answers
25 views

IPv6 DHCP for Hyper-V Guests

I have the following configuration: W2K12 with Hyper-V and DHCP Role installed, and I have IPv6 block. The goal is to assign IPv6 via DHCP to guest VMs, and make guest VM to have access to the ...