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[ubuntu] Migrate Debian firewall rule to Ubuntu

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http://ubuntuforums.org – My old Debian firewall died and I'm migrating saved rules to Ubuntu this way: iptables-restore < firewall_config I get this error: Bad argument `192.168.1.0/255.255.255.0' Error occurred at line: 18 Opening the file here's line 18: -A POSTROUTING -s ! 192.168.1.0/255.255.255.0 -j MASQUERADE What is wrong? (Hardware)