iptables-save 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 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 123.1.2.3 and 123.1.2.4? 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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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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H do I stop Iptables firewall under Debian Linux server system?

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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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