![]() The problem is, that a script with custom chains, ipset's and such is getting very complicated and error prone. The solution would be to append new rules at the end of current, then to remove the old ones, which can theoretically result in continuous ruleset in place. Aside from that, some high throughput traffic runs in into partially restored firewall, which ends up in very bad conntrack entries, which require manual intervention to restore functionality. Lots of stuff breaks if there is no rule for more then 50ms. phoenixnap/kb/iptables-tutorial-linux-firewall of 16. There are different tables for different purposes. In this tutorial, learn how how to install iptables, congure, and use iptables in Linux. Iptables is the tool that is used to manage netfilter, the standard packet filtering and manipulation framework under Linux. I can't afford to just drop all rules and reinsert them, because this is simply too slow. iptables is a command line tool used to set up and control the tables of IP packet filter rules. I have a lot of sensitive traffic, like E1 lines encapsulated into IP packets and many others. This approach works well, to some extent. ![]() I have a script which simply flushes all rules and custom chains, then reloads everything from scratch. It is not possible to operate on the existing iptables configuration, by doing manual inserts/replaces or deletions. I have very complicated and long iptables script. ![]()
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