etc/eth0-input.conf.example

# /etc/mbse-firewall/conf.d/eth0-input.conf
#
# This table is ; separated. From the data in the fields ip(6)tables commands
# are created by the main program. The filename of this file is 
# <iface>-[forward|input|output|postrouting|prerouting].conf and from this name
# the initial part of the command is created.
#
# The first field is a 4 or 6 and defines if this is a IPv4 or IPv6 rule.
#
# The second field is tha -t table type. Values are nat, mangle ... or empty
# for the default filter type.
#
# The 3rd field is the protocol, tcp, udp, igmp, raw etc.
#
# The 4th field is the source address or source network. Valid notations
# are 10.126.150.2 10.1.1.0/24 2001:1af8:feb8:7e96::2
# 2001:1af8:feb8:7e96::2/64 or 0/0 for any.
#
# The 5th field is the source port or ports. Ports may be command separated
# or ranges or a combination of that. See man iptables for the syntax.
#
# The 6th field is the destination address.
#
# The 7th field is the destination port or ports
#
# The 8th field is the action, can be any valid action like:
#    DROP 
#    ACCEPT
#    REJECT --reject-with tcp-reset
#
# The 9th field is special tests, for example:
#    -m state --state NEW
#    -m hashlimit --hashlimit 5/second --hashlimit-burst 10 --hashlimit-mode srcip --hashlimit-name torrent
#    -m connlimit \! --connlimit-above 3 -m hashlimit --hashlimit 1/second --hashlimit-burst 2 --hashlimit-mode srcip --hashlimit-name openvpn
#    -m connlimit --connlimit-above 35
# If you want, write several conditions in the same field.

# Maximum connections per source IP
4;;;;;;;DROP;-m connlimit --connlimit-above 35

# Allow SSH
4;;tcp;;;10.1.1.5;ssh;ACCEPT;-m state --state NEW
6;;tcp;;;2001:1af8:dead:beef::5;ssh;ACCEPT;-m state --state NEW

# Allow CUPS
4;;tcp;10.1.1.0/24;631;10.1.1.255;631;ACCEPT;
4;;udp;10.1.1.0/24;631;10.1.1.255;631;ACCEPT;

# Allow Samba
4;;udp;10.1.1.0/24;138;10.1.1.255;138;ACCEPT;
4;;udp;10.1.1.0/24;137;10.1.1.255;137;ACCEPT;

# Rate limited web
4;;tcp;;;10.1.1.5;80,443;ACCEPT;-m state --state NEW  -m hashlimit --hashlimit 15/second --hashlimit-burst 25 --hashlimit-name http-server
6;;tcp;;;2001:1af8:dead:beef::5;http,https;ACCEPT;-m state --state NEW  -m hashlimit --hashlimit 15/second --hashlimit-burst 25 --hashlimit-name http-server

# DHCP
4;;udp;;67;255.255.255.255;68;ACCEPT;
4;;udp;;68;255.255.255.255;67;ACCEPT;