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Linux Netfilter Tutorials

Tutorials, howtos and tips about Linux netfilter/iptables firewall includes examples, configurations, blocking traffic and IP address, opening and closing ports, and much more. ( rss feed )

Linux: Block Port With IPtables

How do I block port number with iptables under Linux operating systems?
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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 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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How do I read a list of ip address (subnets) using a text file and block all of them using Linux iptables command?
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Disable / Turn Off Firewall in Ubuntu Linux Server

How do I disable the firewall in Ubuntu Linux server edition? How do I turn off the firewall in Ubuntu Linux version 12.04 or 14.04 LTS server?
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I've 10Mbps server port dedicated to our small business server. The server also act as a backup DNS server and I'd like to slow down outbound traffic on port 80. How do I limit bandwidth allocation to http service 5Mbps (burst to 8Mbps) at peak times so that DNS and other service will not go down due to heavy activity under a Linux operating systems?
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Iptables Limits Connections Per IP

How do I restrict the number of connections used by a single IP address to my server for port 80 and 25 using iptables?
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