/etc/fail2ban/action.d/iptables-ipset-proto4.conf is in fail2ban 0.8.11-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 | # Fail2Ban configuration file
#
# Author: Daniel Black
#
# This is for ipset protocol 4 (ipset v4.2). If you have a later version
# of ipset try to use the iptables-ipset-proto6.conf as it does some things
# nicer.
#
# This requires the program ipset which is normally in package called ipset.
#
# IPset was a feature introduced in the linux kernel 2.6.39 and 3.0.0 kernels.
#
# If you are running on an older kernel you make need to patch in external
# modules. Debian squeeze can do this with:
# apt-get install xtables-addons-source
# module-assistant auto-install xtables-addons
#
# Debian wheezy and above uses protocol 6
[INCLUDES]
before = iptables-blocktype.conf
[Definition]
# Option: actionstart
# Notes.: command executed once at the start of Fail2Ban.
# Values: CMD
#
actionstart = ipset --create fail2ban-<name> iphash
iptables -I INPUT -p <protocol> -m multiport --dports <port> -m set --match-set fail2ban-<name> src -j <blocktype>
# Option: actionstop
# Notes.: command executed once at the end of Fail2Ban
# Values: CMD
#
actionstop = iptables -D INPUT -p <protocol> -m multiport --dports <port> -m set --match-set fail2ban-<name> src -j <blocktype>
ipset --flush fail2ban-<name>
ipset --destroy fail2ban-<name>
# 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 = ipset --test fail2ban-<name> <ip> || ipset --add fail2ban-<name> <ip>
# 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
#
actionunban = ipset --test fail2ban-<name> <ip> && ipset --del fail2ban-<name> <ip>
[Init]
# Default name of the ipset
#
name = default
# Option: port
# Notes.: specifies port to monitor
# Values: [ NUM | STRING ] Default: ssh
#
port = ssh
# Option: protocol
# Notes.: internally used by config reader for interpolations.
# Values: [ tcp | udp | icmp | all ] Default: tcp
#
protocol = tcp
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