Dynamic Host Configuration Protocol; allows computers on the same network to automatically obtain unique IP addresses and other network configuration parameters.

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Ubuntu server as DHCP server for dual stack

I currently have an Ubuntu server on VirtualBox set up to give hosts on my GNS3 topology IPv4 addresses, and it is working without issues. However, I would like to have that same DHCP server give out ...
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1answer
35 views

What's the use of search domains? [on hold]

Something you often see as a configurable option for DHCP are the DNS servers and the search domain. Alright, DNS servers have an actual use, but I'm not so sure about search domains. It took me quite ...
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2answers
33 views

DHCP server used reserved IP

I am using DHCP server on centOS 6.5, I reserved an IP for specific MAC address my config file /etc/dhcp/dhcpd.conf option domain-name-servers 192.168.1.5, 8.8.8.8; ...
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9 views

Making multiple DHCP IP permanent in Ubuntu 12.04.5

I followed the instructions here Getting 2 IP addresses on one network card, using DHCP and this worked for me but how do I make it permanent in Ubuntu 12.04? Should I put it in some sort of cron job ...
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21 views

Win7 load balancing over 2 default gateways and 1 interface

This is a scenario I've been working on lately: My PC has 1 NIC connected to a 192.168.100.0/24 network. This network has 2 gateways to the Internet, namely .1 and .254. Now I want to get to the ...
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1answer
35 views

Set DHCP with manual IP

Any idea how can we set a DHCP with manual IP address from the terminal OSX (for a wifi interface)? I know that this set a manual IP but not sure how to keep the DHCP: sudo ipconfig set en1 INFORM ...
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43 views

Dual boot Linux Fedora 22 internet not working

I recently installed Fedora x64 on another partition alongside with windows. I went over the install process many times before I got it installed and sometimes the internet would connect, but I'd see ...
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2answers
55 views

Why does DHCP uses UDP port 67 and 68 for the communication between the client and server?

I know that the DHCP is used to assign an IP address to the client and hence the only possible way to establish the connection is to listen on a specific port. But is there any specific reason behind ...
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13 views

Output of the Show ipv6 dhcp interface

I successfully configured the DHCPv6 server. My CPE is also receiving the prefixes. However, I am not to figure out some of the terms(which are in BOLD) in the output of the command "show ipv6 dhcp ...
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1answer
35 views

Configure localhost to use DHCP IP address

I have a local server Wildfly and I have a test application which I can access: http://localhost:8080 works. Now, I have comcast Xfinity with a modem (no additional router). I am working on CentOS ...
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1answer
54 views

DHCP failure when rebooting RPI 2

When we start up my Raspberry pi 2, we get the following error: When the RPI is rebooted, we are getting an IP and we are able to surf on the internet, so we don't know what the error exactly ...
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34 views

Several Routers and DMZ, WAN, Local LAN

I previously had: A PS3 directly connected to the router given to me by my ISP (Router A). I had the console in a DMZ on this router at IP 192.168.1.33 So I had enabled UPnP for this router and ...
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1answer
46 views

Connect TL-WR740N via wireless to TL-WR340G/TL-WR340GD

I have a TL-WR340G/TL-WR340GD, which is already setup (DHCP, if it matters) to provide Internet over WiFi. I have a spare TL-WR740N which I would like to connect over WiFi to the WR340G. While I ...
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21 views

Guest DHCP server

I have a host (CentOS 7 with kvm/libvirt). There are 2 network interfaces on this host. eth0 and eth1. eth1 has no IP address but instead has subinterfaces for each VLAN it is connected to. An example ...
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1answer
34 views

Disabled DHCP server on secondary routers, cannot access setup page anymore on those

I have the following network configuration in my home: The Telsey DSL modem+router is provided by my ISP and setup configuration page is password protected from them (not default one, I tried brute ...
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26 views

Samba 4 AD: “samba-tool dns” commands do not work from dhcpd script

I've set up my RPi 2 as Samba 4 AD DC with these instructions - https://wiki.archlinux.org/index.php/Samba_4_Active_Directory_domain_controller That page contains script ...
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68 views

How does the guest OS of VirtualBox get a valid dynamic IP address?

I have install CentOS 7 in VirtualBox, and want the guest CentOS using dynamic IP address. The network type is bridged. The host OS is Windows 7, and the network information is like this: I ...
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15 views

OpenWRT: Set individual DHCP credentials for different clients?

Consider a small network of clients and a router running OpenWRT. All clients are getting their IP informations automatically from the DHCP server of the router. The devices in the network should all ...
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1answer
47 views

Can't connect to router after turning off DHCP

So I was playing around with my router and dynamic/static IP addresses and after I tuned off the DHCP server of the Router I am no longer able to connect to the routers web interface even with a ...
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1answer
17 views

isc-dhcpd sanity check fail even though everything looks right

I have a machine in freebsd 8.1 and I am failing to do service isc-dhcpd start it keeps saying "Configuration file sanity check failed" Hint: I copy the /usr/local.rc.d/isc-dhcpd and ...
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1answer
60 views

Virtual Box Bridged network failed to get IP (DHCP) No DHCPOFFERS received

I am newbie in networking and virtual box configuration, I have spent several days dealing with this problem. My goal is to get Bridged network working. When I try to UP interface in my Virtual Box ...
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1answer
76 views

ESXi 5.5 - Management network with no gateway

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 ...
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1answer
48 views

systemd-networkd does not receive dhcp requests

host, container: fc21 $ systemctl start systemd-networkd.service $ systemd-nspawn -b -D `pwd` -M m1 --private-network --network-veth ... In container: $ systemctl start systemd-networkd.service $ ...
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20 views

How to configure two broadband connection on the network so that if one goes down other can automatically start catering to Internet requests

Our earlier setup was 12 PCs connected via a switch. These PCs can connect to eachother via LAN. Broadband connection was via ADSL modem cum router plugged into the switch so that all PCs get internet ...
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1answer
51 views

ipconfig/renew not changing the ip

I try to change my IP address assigned by DHCP using renew command, but it shows only the previous IP address rather than new one. Here is the command : C:\Documents and ...
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22 views

Remote Management address different from Computer Name

We are an educational institution with managed computers using a management server. Our computers are bound to an AD server as well for LDAP. The issue we are having is the remote management addresses ...
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30 views

How configure wpa_supplicant for different static ip addresses

I'm using Raspberry Pi and want it to connect at home to my "Home" network with 192.168.0.50 IP. If available my android network, raspberry should connect to it with dhcpcd dynamically. I found in ...
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1answer
81 views

Multiple virtual network adapters with their own MAC address and external IP address from the DHCP in Windows

I have been searching for a long time on this forum, and although there are many questions about the topic, I wasn't able to get a concrete solution to the problem. I want to have multiple IP ...
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15 views

Wireless home router redirects

I've got this problem: sometimes when I try to visit webpage, my router redirects me to 192.168.0.101(which is my default gateway) and wants to enter in router with username and password(default admin ...
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24 views

How do I use both my router as a secondary DHCP server?

I have a Ubuntu based server and a Draytek router. As it stands, my router is acting as the DHCP server and tells clients to use my ISP's DNS servers. I'd like to look up local machines by name ...
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1answer
9 views

what would be the benefit of adding a dns server to isc-dhcp-server

I have a very simple networking setup. I have a couple server applications like plexmediaserver, transmission-daemon, samba, etc... My router just went down, so instead of buying a new router, I just ...
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1answer
33 views

what is ddns-update-style in isc-dhcp-server on ubuntu

I have a ubuntu server setup as a router (among other things), I now am adding a dhcp server to it. When configuring isc-dhcp-server, the /etc/dhcp/dhcpd.conf file has an option called ...
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1answer
11 views

Port restrictions and MACs

I have a question regarding connections within a university setting. In my room I have two network points. One for my pc and one for my voip phone. Each network port is restricted to one mac address, ...
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2answers
41 views

Router behind router

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 ...
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2answers
70 views

How do I permanently assign an IP address with DHCP?

I am wondering if there is anything (software or hardware) out there that can do something I think I may have made up, Dynamic Static IPs. The idea is that when a new device connects to the local ...
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2answers
50 views

static IP holds good even after changing network to dynamic

I'm using wpa_supplicant as a client to connect to an AP. When i'm trying to change the wireless connection from STATIC to DHCP(dhclient is invoked using the below command with leases ...
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5answers
76 views

Blocking rogue DHCP in network

I'm living in a dorm that has a large network and lots of people connecting their routers to get wifi (they are technically not allowed to do that but no one will check the rooms for connected ...
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1answer
57 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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2answers
44 views

Why did setting a static IP fix my LAN connection issue?

My router is working perfectly, and all other computers use automatic DHCP to get an IP address (all hard wired--no wireless). This one laptop lan connection kept getting stuck "identifying" the ...
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2answers
128 views

Setting up DHCP and NAT on apple extreme with Virgin Media SH (APPLE)

I'm currently going mad trying to get my Apple Time Machine to be the DHCP and NAT Server. I've turned off DHCP in the Super Hub config and turned DHCP and NAT on in the Time Machine. Doing this, I ...
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0answers
99 views

Openwrt bridging issue between wireless and ethernet port

I've this scenario: an AP connected to the STA wirelessly, the AP is a DHCP server I have following configurations in /etc/config/network of the AP: config interface lan option ifname 'eth1 ...
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0answers
15 views

Cannot set static routing or DHCP pool

I've been doing a project in Packet tracer. To start of, this is my topography: LINK, and this my configuration: LINK My todo list is: -create topography : done -set IP's and subnets : done -set ...
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1answer
47 views

How can I add some static IP address at IPv6 for Windows 2012 DHCP server?

I would like to add some static IP address to my Windows 2012 DHCP server. I have tried to pair the IP address with its MAC address. At IPv4 it works, but how can do it at IPv6? Could anybody link a ...
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63 views

DD-WRT Client Bridge: Hosts can't find eachother by name

My LAN is set up like so: lol you need rep to post images guilmon, gabumon are both running Arch Linux A200, phone are running Android laptop is running Windows 7 The problem: I can't seem to find ...
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42 views

Running PsExec via WebService in IIS 7 not working properly

I created a Web Service that will run a Psexec to execute a command to DHCP server (netsh dhcp server DHCP-IP-address show scope). It is running perfectly when I test/run it via Visual Studio in the ...
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2answers
1k views

What is the difference between ARP binding and DHCP address reservation?

In my TL-WR1043ND I have these functionalities and both of them pair an IP address to a MAC address. What is the difference? I red that the ARP one is there for security reasons, others say it is for ...
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1answer
41 views

Wireless clients disconnected from router when PS4 traffic begins

I consider myself pretty good at networking, but this one has me stumped. My brother-in-law has a PS4 connected by wire to his router. All other (three or four) clients are connected wirelessly (one ...
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45 views

DHCP and connection problems on cascade switches and routers

I have the following configuration (one switch at a building floor): The workstations are all DHCP enabled to get IP automatically. When I power up everything works fine. After some time (2 hs) I ...
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1answer
136 views

Does the DHCP server know about static IP addresses?

I have a simple setup up at home with a vendor provided ADSL router and a few home devices I connect to it to connect to the outside world. I would like one of my devices to have a static internal IP ...
2
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1answer
31 views

On boot, how can I switch to a static IP based on a gateway IP provided by DHCP?

I have a "headless" *NIX host -- let's call it 'foo' -- that is to be accessible via SSH and VNC-tunneled-over-SSH on an arbitrary 192.168.x.y/24 private LAN. Sometimes, I want to physically move ...