server hardening
http://www.tecmint.com/how-to-monitor-user-activity-with-psacct-or-acct-tools/
# Turn on execshield kernel.exec-shield=1 kernel.randomize_va_space=1 # Enable IP spoofing protection net.ipv4.conf.all.rp_filter=1 # Disable IP source routing net.ipv4.conf.all.accept_source_route=0 # Ignoring broadcasts request net.ipv4.icmp_echo_ignore_broadcasts=1 net.ipv4.icmp_ignore_bogus_error_messages=1 # Make sure spoofed packets get logged net.ipv4.conf.all.log_martians = 1
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