iptables firewall

Linux Iptables Firewall: Log IP or TCP Packet Header

by on January 9, 2008 · 0 comments

Iptables provides the option to log both IP and TCP headers in a log file. This is useful to: => Detect Attacks => Analyze IP / TCP Headers => Troubleshoot Problems => Intrusion Detection => Iptables Log Analysis => Use 3rd party application such as PSAD (a tool to detect port scans and other suspicious [...]

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Force iptables to log messages to a different log file

by on October 3, 2006 · 38 comments

According to man page: Iptables is used to set up, maintain, and inspect the tables of IP packet filter rules in the Linux kernel. Several different tables may be defined. Each table contains a number of built-in chains and may also contain user defined chains. By default, Iptables log message to a /var/log/messages file. However [...]

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Linux Iptables open Bittorrent tcp ports 6881 to 6889

by on December 8, 2005 · 30 comments

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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How Do I Run a Firewall Script As Soon As eth0 Interface Brings Up?

by on September 26, 2005 · 4 comments

I use ADSL at home via ISP modem. As soon as my eth0 comes up I would like to have my firewall script get executed and setup the iptables firewall rules for me.

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