DHCPD, no free leases

I have an ubuntu 14.04 server and isc-dhcpd-4.2.4. The clients that i already defined in config can get their ip addresses, and newly added mac addresses cannot get their ip number and i got "no...

dhcpv6 returning bad subnet

I have IPv6 on a linux machine and my network and it works. Now I want to set up DHCP for it. I set up the isc-dhcp-server and configured the subnet. Another linux machine (both debian 7) acts as...

Running Intel 7260 in AP mode under Ubuntu 14.04

I would like to use the built-in WiFi on a Gigabyte mini-ITX system I just bought as an access point. And for some reason I am going in circles. lspci | grep -i wireless reveals: 04:00.0 Network...

ISC DHCP does not refresh DNS entries

In our company network we have the following setup: a Debian server with a DHCP server (isc-dhcp-server 4.3.1, backported on Debian 7.8) which serves client requests from an IP pool two Windows...

IPv6: how do I assign a /56 if I get a /48 PD from my ISP?

My ISP gives me a /48 prefix delegation. My home made router/firewall (Debian 8) uses wide-dhcp6c to get the PD on the external interface ("net"), it chops it into /64 prefixes that it assignes to...

Restoring package state without upgrade to keep Docker Container small

As a step of a Dockerfile I need to install the build-essential package (if not available) and run make. To keep the footprint of the container nice and small; I would also like to remove...

installing `lightdm` in Dockerfile raises interactive keyboard layout menu

I have the following Dockerfile: # Pull from CentOS RPM Build Image FROM ubuntu # Update the image RUN apt-get update -y RUN apt-get install lightdm -y The problem I have is when I'm building...

Qt4.8 how receive any packets aka sniff DHCP by QUdpSocket?

I am trying to create a simple DHCP client using Qt4.8. I Have two host: Server with ip address inet addr:1.5.1.10 Bcast:1.5.1.255 Mask:255.255.255.0 and isc-dhcp-server that sends the following...

CloudFlare 525 Handshake SSL failed after ubuntu update

I have 2 servers up at DigitalOcean. Both each have 2 sites with SSL & DNS setup via Cloudflare. They're all the same setup (nginx). Yesterday after upgrading one of the server, I started getting...

Linux gitian-builder and "dpkg: error processing package sudo"

I am using Ubuntu. I cannot compile the Virtual Machine. If i direct to gitian-builder and type into the Terminal: sudo bin/make-base-vm -a i386. It compiles for approximately 3 minutes and than...

Phalcon extension unloaded after system upgrade

So, I am using Phalcon 3.0.0 with PHP 7 on Ubuntu 16.04.1 on DO. Everything worked correctly until today, when I ran apt update and upgrade on Ubuntu. After the process finished, Phalcon plugin...

ISC DHCP Option 121 Limitations

Trying to add 15 classless routes to option 121, however there appears to be a limit to how many I can add (or a limit on the packet size maybe?). The Windows server I am copying from does not...

force raw packets to go through iptables

When using raw sockets to create raw ethernet frames, the resulting packets are not traversing the iptables, even if the frames created represent valid ethernet + ip + upd packets. In my case this...

Can't upgrade R because of dependency

I want to upgrade R (version 3.0.2) to a newer version like 3.4.1 but I face a complicated problem in dependency which prevent me to do this. I typed on terminal many codes using several solutions...

Declare DHCP custom option and configure client to send it

I would like to classify DHCP clients to be served an IP address from a pool defined in a subnet declaration in an ISC DHCPD's config file, and update the DNS server with that information. Using...

Crafting a DHCP OFFER packet in scapy

I'm writing a very simple DHCP server using scapy and I'm stuck on sending an offer packet. Right now I'm doing it like this: ethernet=Ether(dst=dest_mac, src=hw, type=0x800) ip=IP(dst=dest_addr,...

ISC dhcrelay is not forwarding the DISCOVER packets to dhcp server

I am doing DHCP relay POC. I have setup as following. DHCP Client(VX-works) ----------- DHCP Relay----------- DHCP Server (VXworks) In this setup, DHCP Client is sending the DICOVER packets, but...

HyperV Gen2 VM not booting over PXE

I have two VMs in HyperV, both on the same virtual switch (internal), on the same subnet. I am trying to set up one as a DHCP and TFTP server for PXE boot. With Gen1 machine, it's working fine...

Is there any hook for finishing the DHCPACK in isc-dhcp-server

I want to run a script in the server after the isc-dhcp-server send the DHCPACK packet to client. The only solution I get is running a script to retrieve the dhcp log, but it is not efficient. Any...

how can I prevent systemd-networkd from sending client identifier?

I have a machine with CoreOS 1800(or 1855) installed onto disk, and with following systemd-networkd config (there is only one network interface in the machine): $ cat...

Small AD Domain, how to enforce Proxy settings but only for home LAN? (Windows 10 clients)

I own/administer a small LAN for home where most of the stuff is Linux-based. The end-users (teens, wifey) usually do stuff through their Windows 10 Laptop so I created a small AD Domain based on...

Rails & Docker: configure bundler to run bundle install in a docker build for Rails.4.2.6?

I am having so much trouble with docker. It seems to be a pattern. I have a dockerfile which installs Node.js and Yarn from source repositories fine. I install ruby from the get-apt repositories...