Excentis staff members regularly write on technical and less technical topics in our different business areas. We hope you will find some useful gems of information here. If you have any suggestions we love to hear from you on blog@excentis.com.

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This blog post shows how to configure the ISC DHCP server to provision cable modems. Cable modems use DHCP, the Dynamic Host Configuration Protocol, to obtain the basic connectivity settings, including a number of DOCSIS-specific DHCP options.
Cable modems get their operational parameters using config files. These config files define what the internet subscription will be, what additional services are activated and other configuration details. This blog post will get you started creating your own modem config file.
Wi-Fi has become the preferred technology for in-home connectivity, but sometimes it’s needed to connect a wired device (e.g. a printer) to a Wi-Fi network using a Wi-Fi bridge. In a wired world bridges are used very often and typically don’t cause much problems. In the Wi-Fi world the situation is slightly different, read on and find out why!
Rigorously testing a network device or distributed service requires complex, realistic network test environments. Linux Traffic Control (tc) with Network Emulation (netem) provides the building blocks to create an impairment node that simulates such networks. This final post of a three-part series shows how to set up an impairment node in practice.
Traditionally, when a home user sets up a home network, a lot of manual configuration is needed. While the IPv6 configuration can be done in an automated way by using Prefix Delegation, the IPv4 setup requires manual configuration of subnets and routes within the network. The mechanism of Link-ID describes a way to derive IPv4 subnets from the IPv6 subnet, so manual configuration of the first is no longer needed.
Today, Network Address Translators (or NAT) devices are everywhere. Their rapid rise towards universal adoption was not part of a planned effort. Instead, it was fueled by the continued growth of the internet and the corresponding depletion of the IPv4 address space. Besides obvious advantages, such as IP address reuse and hiding of internal network topologies, NAT technology has some important drawbacks as well. This blog post takes a closer look at these downsides.