FreeBSD reserves 8 % of the disk space, which only root can fill. This 8% is is not mentioned in the df statistics.
OpenBSD does the same, only there the percentage is 5%.
For more info see the FreeBSD FAQ: http://www.freebsd.org/doc/en_US.ISO....html#DU-VS-DF and http://www.freebsd.org/doc/en_US.ISO...MORE-THAN-FULL
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You don't need to be a genius to debug a pf.conf firewall ruleset, you just need the guts to run tcpdump
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