Both the portage tree, and the distfiles directory are shared from River to serve local machines needing to query public servers for <tt>emerge –sync</tt> and downloads of common packages.
To use the local mirrors, set the following variables in <tt>make.conf</tt» /etc/make.conf|<source lang="bash"> SYNC="rsync://gentoo-mirror.sihnon.net/gentoo-portage" GENTOO_MIRRORS="http://gentoo-mirror.sihnon.net" </source>
Syncing the portage tree just before installing something can be annoying, so it might be useful to keep your tree up to date automatically. If you have several local machines, it would be a good idea to set up a local mirror, to save bandwidth and to avoid abusing the public mirrors.
Add the following script to your daily crontab directory:
Another scheduled task which might be useful is a weekly check of which packages are outdated on your system.