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*filter
# default policy is DROP
-P INPUT DROP
-P OUTPUT DROP
-P FORWARD DROP
# open loopback interface
-A INPUT -i lo -j ACCEPT
-A OUTPUT -o lo -j ACCEPT
# allow PT-TLS
-A INPUT -i eth0 -p tcp --dport 271 -j ACCEPT
-A OUTPUT -o eth0 -p tcp --sport 271 -j ACCEPT
# allow inbound ssh
-A INPUT -p tcp --dport 22 -j ACCEPT
-A OUTPUT -p tcp --sport 22 -j ACCEPT
# allow outbound ssh
-A OUTPUT -p tcp --dport 22 -j ACCEPT
-A INPUT -p tcp --sport 22 -j ACCEPT
# allow crl fetch from winnetou
-A INPUT -i eth0 -p tcp --sport 80 -s 192.168.0.150 -j ACCEPT
-A OUTPUT -o eth0 -p tcp --dport 80 -d 192.168.0.150 -j ACCEPT
COMMIT
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