The easiest way to install the packages is to add the repository provided in the list below to /etc/opkg.conf

^ Buffalo                                                                                  |||||
^ Device                                                             ^ Packages                                                  ^ Repository                                                             ^ Status      ^ Comment ^
| [[http://wiki.openwrt.org/toh/buffalo/wzr-hp-g300h|WZR-HP-G300NH]] | http://openwrt.mysmartgrid.de/ar71xx/packages/ | http://openwrt.mysmartgrid.de/ar71xx/packages/Packages.gz | untested    | DD-WRT by Buffalo does not allow to install packages |
^ TP-Link                                                                                  |||||
^ Device                                                             ^ Packages                                                  ^ Repository                                                          ^ Status   ^ Comment ^
| [[http://wiki.openwrt.org/toh/tp-link/tl-mr3420|TL-MR3220]]        | http://openwrt.mysmartgrid.de/ar71xx/packages/ | http://openwrt.mysmartgrid.de/ar71xx/packages/Packages.gz | working  |  |