Linux Iptables Limit the number of incoming tcp connection / syn-flood attacks
A SYN flood is a form of denial-of-service attack in which an attacker sends a succession of SYN requests to a target's system. This is a well known type of attack and is generally not effective...
View ArticleLinux Iptables allow or open IMAP server port
The Internet Message Access Protocol (commonly known as IMAP or IMAP4) is an application layer Internet protocol that allows a local client to access e-mail on a remote server. An IMAP protocol is used...
View ArticleLogging to a centralized loghost from Router or other hosts
It is really a good idea to have one central logging host for security and performance reason. For example monitoring log files will help you to detect: * Security risks (you can see failed login...
View ArticleIptables allow CIPE connection request
From my mail bag: How do I accept CIPE connection requests coming from the outside? CIPE stands for Crypto IP Encapsulation (see howto Establishing a CIPE Connection) . It is used to configure an IP...
View ArticleLinux Iptables: How to specify a range of IP addresses or ports
Someone recently asked me a question: How can I save time and script size by specifying a range of IP addresses or ports using iptables? In old version of iptables IP address ranges are only valid in...
View ArticleLinux Iptables Firewall: Log IP or TCP Packet Header
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...
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