The rule below is an example of dropping packets based on their state (here: a new connection): This feature is considerably slower than the stateless solution, but it allows more actions to be performed. However, easy state-tracking has its price - performance. whether the connection has already been established or not (the packet initiates a new connection). Using stateful filtration allows the packet to be analyzed in the context of the session status, e.g. Filtering rules can be divided into 2 types which differ considerably: stateful and stateless. Iptables is the most popular method when it comes to processing packets in Linux. If you are experiencing network issues in your Linux environment, remember that our guide on Linux network troubleshooting can help you diagnose and resolve the problems with your network configuration. 1 Packet flow in the Linux kernel, source Wikipedia QOS - using the tc filter command design for QOS filteringįiltration on OSI layer 7 using a user space applicationīefore we begin: just a quick reminder about packet flow in the Linux kernel:įig. BGP Flow Spec (how to deploy iptables’ rules using BGP protocol).IP routing - transferring packets according to the routing table
Ip rule - a tool designed to build advanced routing policies Nftables - successor of iptables+ebtables Iptables - responsible for filtering packets handled by TCP/IP stackĮbtables - the same as above, but mostly focused on layer 2 (the comparison between ISO/OSI and TCP/IP models is presented in our infographic)
These methods are not restricted to just firewall rules and can be divided into six main categories: In this blog post we want to share them with you.
Have you ever wondered how to drop a packet in Linux OS? Well, there are a few methods to do it.
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