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fail2ban/config/action.d/ipfilter.conf

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# Fail2Ban configuration file
#
# NetBSD ipfilter (ipf command) ban/unban
#
# Author: Ed Ravin <eravin@panix.com>
#
#
[Definition]
# Option: actionstart
# Notes.: command executed on demand at the first ban (or at the start of Fail2Ban if actionstart_on_demand is set to false).
# Values: CMD
#
# enable IPF if not already enabled
actionstart = /sbin/ipf -E
# Option: actionstop
# Notes.: command executed at the stop of jail (or at the end of Fail2Ban)
# Values: CMD
#
# don't disable IPF with "/sbin/ipf -D", there may be other filters in use
actionstop =
# Option: actioncheck
# Notes.: command executed once before each actionban command
# Values: CMD
#
actioncheck =
# Option: actionban
# Notes.: command executed when banning an IP. Take care that the
# command is executed with Fail2Ban user rights.
# Tags: See jail.conf(5) man page
# Values: CMD
#
actionban = echo block <blocktype> in quick from <ip>/32 | /sbin/ipf -f -
# Option: actionunban
# Notes.: command executed when unbanning an IP. Take care that the
# command is executed with Fail2Ban user rights.
# Tags: See jail.conf(5) man page
# Values: CMD
#
# note -r option used to remove matching rule
actionunban = echo block <blocktype> in quick from <ip>/32 | /sbin/ipf -r -f -
[Init]
# Option: Blocktype
# Notes : This is the return-icmp[return-code] mentioned in the ipf man page section 5. Keep this quoted to prevent
# Shell expansion. This should be blank (unquoted) to drop the packet.
# Values: STRING
blocktype = "return-icmp(port-unr)"