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# @sysconfdir@/firewall.d/rules4
#
# Host Specific IPv4 Firewall Rules for Linux Server
#
# THIS FILE IS INTENDED TO CONTAIN FIREWALL RULES SPECIFIC TO AN INDIVIDUAL
# SERVER.
#
# USE ONE OF THE FOLLOWING FILES FOR GLOBAL RULES:
# @sysconfdir@/firewall.d/global.d/ipsets
# @sysconfdir@/firewall.d/global.d/rules
# @sysconfdir@/firewall.d/global.d/rules4
# @sysconfdir@/firewall.d/global.d/rules6
#
# USE ONE OF THE FOLLOWING FILES FOR SERVER CLUSTER RULES:
# @sysconfdir@/firewall.d/cluster.d/ipsets
# @sysconfdir@/firewall.d/cluster.d/rules
# @sysconfdir@/firewall.d/cluster.d/rules4
# @sysconfdir@/firewall.d/cluster.d/rules6
#
# USE ONE OF THE FOLLOWING FILES FOR APPLICATION RULES:
# @sysconfdir@/firewall.d/apps.d/<app name>/ipsets
# @sysconfdir@/firewall.d/apps.d/<app name>/rules
# @sysconfdir@/firewall.d/apps.d/<app name>/rules4
# @sysconfdir@/firewall.d/apps.d/<app name>/rules6
#
#########################
# #
# FILTER Table (IPv4) #
# #
#########################
*filter
# allow all ICMP traffic
-I INPUT -p icmp -j ACCEPT
## accept SSH connections from RFC1918 addresses
#-A INPUT -p tcp -s 10.0.0.0/8 --dport ssh -j ACCEPT
#-A INPUT -p tcp -s 172.16.0.0/12 --dport ssh -j ACCEPT
#-A INPUT -p tcp -s 192.168.0.0/16 --dport ssh -j ACCEPT
## accept DNS queries from RFC1918 addresses
#-A INPUT -p tcp -s 10.0.0.0/8 --dport domain -j ACCEPT
#-A INPUT -p udp -s 10.0.0.0/8 --dport domain -j ACCEPT
#-A INPUT -p tcp -s 172.16.0.0/12 --dport domain -j ACCEPT
#-A INPUT -p udp -s 172.16.0.0/12 --dport domain -j ACCEPT
#-A INPUT -p tcp -s 192.168.0.0/16 --dport domain -j ACCEPT
#-A INPUT -p udp -s 192.168.0.0/16 --dport domain -j ACCEPT
COMMIT
######################
# #
# NAT Table (IPv4) #
# #
######################
*nat
## prevent NAT for RFC1918 addresses to RFC1918 addresses
#-A POSTROUTING -s 10.0.0.0/8 -d 10.0.0.0/8 -j ACCEPT
#-A POSTROUTING -s 10.0.0.0/8 -d 172.16.0.0/12 -j ACCEPT
#-A POSTROUTING -s 10.0.0.0/8 -d 192.168.0.0/16 -j ACCEPT
#-A POSTROUTING -s 172.16.0.0/12 -d 10.0.0.0/8 -j ACCEPT
#-A POSTROUTING -s 172.16.0.0/12 -d 172.16.0.0/12 -j ACCEPT
#-A POSTROUTING -s 172.16.0.0/12 -d 192.168.0.0/16 -j ACCEPT
#-A POSTROUTING -s 192.168.0.0/16 -d 10.0.0.0/8 -j ACCEPT
#-A POSTROUTING -s 192.168.0.0/16 -d 172.16.0.0/12 -j ACCEPT
#-A POSTROUTING -s 192.168.0.0/16 -d 192.168.0.0/16 -j ACCEPT
## NAT 10.0.0.0/8 and 172.16.0.0/12 to public through 203.0.113.10
#-A POSTROUTING -o ppp0 -s 10.0.0.0/8 -j SNAT --to-source 203.0.113.1
#-A POSTROUTING -o ppp0 -s 172.16.0.0/12 -j SNAT --to-source 203.0.113.1
## NAT 192.168.0.0/16 to public through 203.0.113.192
#-A POSTROUTING -o eth0 -s 192.168.0.0/16 -j SNAT --to-source 203.0.113.2
COMMIT
######################
# #
# RAW Table (IPv4) #
# #
######################
*raw
COMMIT
# end of rules
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