iptables command

I am a new Ubuntu Linux version 12.04 LTS user. How do I stop or start iptables based firewall service on Ubuntu Linux using bash command line options?

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I am the small business owner and runs my own web-site. I have noticed increased cracking activity against by blog. What’s the best way to block WordPress URLs such as example.com/blog/wp-login.php and example.com/blog/wp-admin/ in the nginx web-server?

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I am using /sbin/iptables -L -v -n | more command. However, I am unable to list NAT rules. How do I use iptables to view or list NAT rules stored in NAT tables? How do I see all the rules in NAT tables under CentOS / RHEL based server?

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I have setup an Apache web server on CentOS Linux. How do I configure firewall to allow or block access? How do I setup firewall for a web server under RHEL or CentOS Linux v6.x?

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My server has five Ethernet ports and one ADSL port. How do I setup IPv4 software bridge using Debian Linux operating systems so that the rest of five ports act as a network switch?

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How do I install the ipset extension to Netfilter/iptables on Red Hat Enterprise Linux / CentOS Linux v6.x?

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I have MySQL database system running on FreeBSD. The server has multiple ip address. The mysqld used by many websites hosted on two other CentOS based servers. I would like to bind MySQL sever running on Unix / Linux server to more than one IP address such as 202.54.1.2, 202.54.1.10, and 202.54.1.15. How can I bind mysqld to multiple ips?

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