https://www.pfsense.org/download/
https://mag.osdn.jp/16/04/15/144500
http://news.mynavi.jp/news/2017/06/14/115/
tips-OPNsense
https://opnsense.org/download/
https://vyos.io/
http://www.hongo.wide.ad.jp/exp/2010w/quagga.html
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