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# Allows SMTP access -A INPUT -p tcp --dport 25 -j ACCEPT # Allows pop and pops connections -A INPUT -p tcp --dport 110 -j ACCEPT -A INPUT -p tcp --dport 995 -j ACCEPT # Allows imap and imaps connections -A INPUT -p tcp --dport 143 -j ACCEPT -A INPUT -p tcp --dport 993 -j ACCEPT replace smtp access with this line in iptables. comment out old line or ...


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This should be configured on whatever equipment you have between the DNS server and the outside world. AFAIK port forwarding is disabled by default on pretty much everything so you shouldn't worry too much about it. If you're using residential network gear, there should be port forwarding configuration options in the web interface. To check the port ...


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A firewall does not exist in a single place in the kernel network stack. In Linux, for instance, the underlying infrastructure to support firewall functionality is provided by the netfilter packet filter framework. The netfilter framework in itself is nothing more than a set of hooks at various points in the kernel protocol stack. Netfilter provides five ...


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"Is there anything else I have to configure?" Your router, perhaps. You really have not provided enough information to provide a definitive answer, all you've done is point out is not because of iptables...perhaps. Iptables rules are processed in order. If that was the last rule appended (-A) and is last in the list when you look at iptables -L, then ...



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