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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109 views

Ethernet connection dropping - DHCP issue?

A user with a Fedora installation is experiencing intermittent interruptions to his wired internet connection on the LAN. I've swapped cables and ports and double checked my VLANS and switchport ...
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108 views

Windows DHCP server with multiple subnets

I have a Win 2012R2 DHCP Server in one physical network.(All clients have reservations) Now I have to add more clients and therefore I ran out of IP addresses.(Note this are Class B addresses, without ...
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47 views

Netgear WPN824 v3 as Wifi AP

How can I use my wifi router as a wifi AP? I have disabled DHCP(on this "secondary device") and it is in the same subnet as main router. I use LAN port to connect it to main router. Devices can ...
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54 views

What is preventing Windows from obtaining new IP from DHCP?

I have Windows XP box, which is getting IP address from TFTPD32 application. So in tftpd32.ini I have specified static record: 08:00:27:CE:9B:AD=10.10.1.3 Now I would like to change that record so ...
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188 views

Android & iOS Devices over WLAN can't acquire DHCP IP Address

Here's our configuration : WiFi Access Point with DHCP turned off is connected to our main network. Our main network is serviced by a hardware DHCP (Kerio Control) DNS is serviced by two Windows ...
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42 views

iptables config to restrict dhcp trafic

eth0 is connected to internet, and eth1 is connected to clients, giving dhcp addresses. However, I've got some clients getting IP addresses via eth0. Is there a way to put a line on iptables dropping ...
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120 views

dnsmasq does not start upon system boot

I am using a RasPi with Kali Linux installed on it. Problem is, that dnsmasq does not seem to start at all during boot. confirmation for that was found here: root@kali:/etc/init.d# update-rc.d ...
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63 views

Why would powerline adaptors work for direct connection but not access point

This is similar to this superuser question and I think pretty much identical to this question neither of which led to satisfactory answers. Basically I want to add a wireless access point to my ...
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200 views

OpenVPN client fails to activate pushed DHCP options for DNS and DOMAIN

OpenVPN client is connecting to OpenVPN server OK. During connection, we see the options pushed contain dhcp-option of DNS 10.0.0.2 and DOMAIN prd1.o2: Sun Aug 2 17:31:06 2015 PUSH: Received ...
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126 views

What is the correct syntax for the dhclient.conf supersede statement?

I am using the Internet Systems Consortium DHCP Client 4.2.4. I want to use the supersede statement to override two DNS servers from DHCP. The corresponding man page section reads: The supersede ...
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77 views

dd-wrt subnet from network with in a network

I am testing some network configurations. I am trying to create a network within a network for TESTING PURPOSES ONLY. Basically the gateway for ARouter(made up name for main router) is 192.168.0.1(for ...
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92 views

dnsmasq pass a url using dhcp option 43

I have been reading the documentation of dnsmasq and different examples found on internet but I have been unable to succeed. I am trying to pass a URL to the CPE using dhcp option 43. The CPE is ...
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78 views

Debian 8: Server makes routers dhcp crash

I've got an old pc with debian 8 running as home server. A small problem is that whenever the server uses a lot of network traffic, let's say while downloading torrents, it seems to crash the dhcp of ...
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53 views

I cannot capture DHCPv6 packets on GNS3 using Wireshark

I have got a router set up as a DHCPv6 server connected to a host that gets an IPv4 & IPv6 addresses from it, however I am not able to capture any DHCPv6 packets at any point of the connection. ...
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119 views

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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202 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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336 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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55 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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63 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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239 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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400 views

Mikrotik RB 951 unable to ping LAN and Internet

My Mikrotik RB951 has the ether1 interface configured as a DHCP client and connected to the LAN DHCP server. It gets served IP address automatically but is unable to ping other devices in the LAN and ...
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56 views

Computers on the network randomly try to contact ISP DHCP not router DHCP

I've been fighting with this issue for a few weeks, but one of my clients has Cox Communications as an ISP, with their standard modem, and a Netgear Nighthawk x6 router. Originally the client had ...
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81 views

Both Public and Private DNS not working. How make it work properly without any conflict

I setup private network so I installed DHCP in one of my server. Now my public network DNS is not working. How can I setup DNS for private network with conflict the public network DNS? DHCP Setup. ...
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200 views

How to bridge two interfaces both on different networks with different IP addresses in OpenWRT?

My embedded Linux device—running OpenWRT—has two interfaces that are ath0 and ath1. ath0 is a WLAN port also runs a DHCP server. ath1 is used for Internet connection. Now, I have to setup these ...
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122 views

ddclient updating to public IP instead of private IP

This is the antithesis to question 389125 I have private services (apache, ssh, synergys for example) accessible on a desktop on the local network. This is not with centralised login (ldap/AD for ...
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926 views

How to set up Networking and DHCP in windows server 2012 inside VirtualBox?

Background: Three operating systems are installed inside VirtualBox: Windows Server 2012 R2 Windows 8 Pro Windows 8 Enterprise So, I want to set up the Server 2012 R2 as Domain Controller, DHCP, ...
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22 views

dhcpd3 not reusing IP for mac

I have an ip range with two ip-addresses defined as follows in my dhcpd.conf: subnet 192.168.1.0 netmask 255.255.255.128 { range 192.168.1.10 192.168.1.11; default-lease-time 600; ...
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160 views

How does DHCP work when it's not “between” your modem and devices?

I've been looking into different options for running some services on a home server. One such option is Amahi. During the setup process they recommend shutting off any other DHCP server on your ...
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116 views

Networking a small office with VPN

Recently I purchased a CISCO RV042 Small Business router with VPN Capability, obviously to allow external connection to this office via VPN to access a NAS where business files are stored. I am not ...
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2k views

D-Link Powerline AV500 Issues? One Powerline LED green and the other one not lit? Maybe also messing up DHCP?

A few times now I noticed while one of my Powerline adapters has a solid green LED, the other is not even lit. I understand the oscillation in my electric circuit influences the quality of the signal ...
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1k views

CentOS 7 can't get IPv4 address from DHCP server

I have classroom full of computer running CentOS 7 and only one computer can't get IPv4 address from DHCP server during boot, because NIC is not yet up, when dhcp client tries to get IPv4 address from ...
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37 views

Strange IP settings issue

Friend of mine is having a puzzling issue I've not come across before. Windows Vista box, logs into an SBS2003 domain controller @ 192.168.1.50. The first time the issue popped up (about two months ...
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50 views

Special type of DMZ?

So I have a standard modem-router setup all great to go, my Modem gives an IP Address from my provider via DHCP according to my Mac address. All is good. However, I now want to expose a new virtual ...
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32 views

Can't acess WinXP from Win7 on domain

I have a Windows 7 computer and I can't access any windows xp machine using their computer name directly. eg. \\co01 but I am able to access them using the IP address e.g. \\192.168.0.55 So I need to ...
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87 views

Dilemma about how my wireless devices obtain IP address

Currently in my network there are 7 wireless outdoor equipment and 1 switch . This switch act as backbone switch for my network as internet supply from ISP is connected to this switch. Through this ...
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361 views

DHCP letting multiple devices get same IP address - how to trouble shoot?

I am using a win2008 server with AD to also serve DHCP and DNS. I have some wifi AP's that are giving me trouble (dropping connections and generally misbehaving). The issue that I notice is that the ...
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506 views

How can I delete old IP configurations received via DHCP on Windows 7?

I noticed in the log of a DKIM verifier plugin for Thunderbird (that retrieves DNS servers to query from the OS configuration) that my Windows registry still has IP addresses for name server that ...
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51 views

Prevent DHCP Lease Updates From Adding Gateways

I am having a problem preventing DHCP Lease Updates from modifying my route table in Windows. My issue is that I am routing all my traffic through a VPN and purposefully delete the 0.0.0.0 route ...
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465 views

multiple DHCP servers for wireless users on same subnet

I am trying to set up 2 router in our network with following set up. 2 routers, 1 is the main router that DHCP is enabled to assign ip to all wired PCs, the other one can be assumed for guest, which ...
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215 views

(Windows 7)Bridge: (tap+wifi) -> ok, (tap+ethernet) -> dhcp is not working. What are possible problems?

All this happen on win 7. I set up the ovpn bridged connection with wifi+tap bridged, and it worked fine. Now I need to make it use ethernet instead of wifi, but bridging of ethenet+tap has issues: ...
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614 views

How to create a dhcpd.conf file

I have followed the tutorial on this page to create an access point on an Arch Linux install. It seems that went mostly ok apart from an error from DHCPD server: Internet Systems Consortium DHCP ...
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489 views

How does my ISP knows that I am sharing my internet connection? and how to bypass it?

I am in a student residence hall.There is one ethernet socket in the room. I can connect my laptop to the cable, but how can I get internet in my iPad? It will be good to have internet on both of ...
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32 views

Script to email administrator when a duplicate IP is found on the network

I know this is a bit of a custom requirement but I was hoping someone currently has (or can put together) a script that checks for duplicate IP addresses on a network (something that might occur when ...
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214 views

Relinux Live CD - waiting for network configuration

I installed ubuntu 12.04 base system via minimal ubuntu iso. I make a script to get hostname from dhcp server which explained here. It works perfect. I don't install network manager because I dont ...
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214 views

Network Instable Connection over LAN, Airport Express works

I just got a cubox-i4 but have a big problem with the LAN connection. It establishes and crashes again. The thing is, that if I connect it via LAN to an Airport Express (connected via wifi), the ...
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2k views

Dnsmasq running on raspberry pi will serve non-local DNS to ethernet but not wireless hosts

I have a Linksys WRV200 wireless router. I have just added a raspberry pi, connected via ethernet, working as a DCHP server and caching DNS server. Dnsmasq also serves local domain names. Dnsmasq ...
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2k views

iPhone self-assigning IP address 169.xxx.xxx when connecting to my slave router

My aim is to have a network configured where all devices can see and communicate with each other, all devices should have access to the internet as standard. The reason why I have decided on a ...
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636 views

Network resource access control (maybe using VLANs?)

I'm trying to set up a network that has a couple of different device groups with different access rights. Physically, devices are connected to the network either via wall-ports or via one of several ...
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871 views

BOOTP packets blocked while DHCP packkets are accepted

We have an IP system that makes use of BOOTP for updating our embedded devices over IP. The main app uses DHCP for its IP configuration. Our devices are usually on the network of the customer, the ...