Iptables

Iptables has a special module called owner (ipt_owner), which is attempts to match various characteristics of the packet creator, for locally generated packets. It is valid in the OUTPUT and POSTROUTING chains.

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Recently I was asked to control access to couple of services based upon day and time. For example ftp server should be only available from Monday to Friday between 9 AM to 6 PM only. It is true that many services and daemons have in built facility for day and time based access control.

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LAN or wireless access can be filtered by using the MAC addresses of the devices transmitting within your network. A mac address is acronym for media access control address, is a unique address assigned to almost all-networking hardware such as Ethernet cards, routers, mobile phones, wireless cards and so on (see mac address at wikipedia for more information). This quick tutorial explains how to block or deny access using MAC address using iptables – Linux administration tool for IPv4 packet filtering and NAT.

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Explains how to monitor bandwidth with Linux iptables command.

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I already wrote about Linux command line bittorrent client. However, I received few more queries regarding firewall issues. Basically you need to open ports using iptables. Bittorrent client by default uses tcp 6881 to 6889 ports only. In order to work with Bittorrent client you need to open these ports on firewall. Remember, if you […]

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If you’re new to Linux, here’s a simple firewall that can be setup in minutes. Especially those coming from a Windows background, often lost themselves while creating linux firewall. This is the most common question asked by Linux newbies (noobs). How do I install a personal firewall on a standalone Desktop Linux computer. In other […]

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PostgreSQL is an object relational database system that has the features of traditional commercial database systems with enhancements to be found in next-generation DBMS systems. PostgreSQL is free and the complete source code is available. Open port 5432 By default PostgreSQLt listen on TCP port 5432. Use the following iptables rules allows incoming client request […]

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