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iptables-restore command

Ubuntu: Stat / Stop / Restart Iptables Firewall Service

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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Iptables Drop IP Address

How do I block particular IP addresses or host with the iptables command under Linux?
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Linux Network IP Accounting

I need to know how much data are transmitted on my ppp0 network or eth0 Internet links? How do I set IP accounting by address such as and How do I set IP accounting per Apache virtual domain? How do I set accounting by service port (http, smtp) and protocol (tcp, udp, icmp)? How do I record how much traffic each of the clients computer is using?
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Ubuntu Linux Save / Restore Iptables Rules

I want to make changes to an iptables configuration. How to do I Save and Restore an iptables Configuration in Ubuntu Linux server?
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How Do I Save Iptables Rules or Settings?

I am using GUI tool to setup firewall rules for my home computer connected to ADSL (DSL/Cable) network. However, after reboot my rules are not saved. Is there any way I can save and load all firewall rules again?
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