Some of these OpenWrt features may be found in DD-WRT as well. Note that this isn't an exhaustive or exclusive list. For those who want the most in-depth insights possible into their network's behavior - in real time, to boot - OpenWrt's package collection includes apps like Nagios to make this possible. Real-time stats collection and monitoring.A sly way to enable external access through a firewall, port knocking isn't widely used as a regular security measure, but OpenWrt makes it possible to configure such a setup if you want to use it. OpenWrt's wireless drivers allow such configurations. Protocols like 802.11s and BATMAN allow ad-hoc creation of mesh or peer-to-peer networks between devices. Generally, most any hardware device that has Linux support will work, although you may be limited in your choice of devices by the connectivity of the router itself. Aside from USB-connected storage, this includes devices like printers, Web cameras (a do-it-yourself home security system!), and even audio systems. Support for a wide variety of USB-connectable devices.Some commercial routers now allow you to share storage that's attached directly to the router via USB or eSATA. OpenWrt lets you redefine the functions available to such buttons. Many routers feature built-in hardware elements such as an action button (usually involving Wi-Fi Protected Setup). Special hardware configuration options.OpenWrt includes most of the above features and more: It's a service to allow network tunneling for game consoles - mainly Microsoft's Xbox - so that they can connect to the XLink Kai gaming network. You should use it only if your router and your other network hardware support it, or you'll actually see a net loss in performance. A speed-enhancement system supported by some wireless network devices based on the Broadcom chip set. These include Dnsmasq, a local DNS server that speeds up host-name lookups, as well as support for dynamic DNS providers like TZO, No-IP, and DynDNS. UPnP media streaming is also included as a standard item on just about every DD-WRT build. Most routers have basic QoS management, but some of the DD-WRT builds (mainly the commercially available version) can give you more sophisticated QoS settings, allowing you to specify such items as maximum bandwidth per netmask or MAC address. DD-WRT has native IPv6 functionality, as well as the 6to4 address-translation system. With the world rapidly running out of IPv4 address space, it's nice to know your router can speak IPv6 natively if it has to. You can edit the firewall through DD-WRT's own Web-based interface or use a tool like Firewall Builder to do most of the heavy lifting. Every router these days comes with a firewall, but the one included with DD-WRT is based on the iptables firewall in Linux and thus is extremely powerful and configurable. A full list of the features in DD-WRT would spill over to pages on end, but here's a rundown of the most significant and widely used items:
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