![]() ![]() The problem is, that a script with custom chains, ipset's and such is getting very complicated and error prone. Change this to DROP for all INPUT, FORWARD, and OUTPUT chains as shown below. Set Default Chain Policies The default chain policy is ACCEPT. With iptables, you can configure your own set of rules. In order to flush the entire table, and begin anew: sudo iptables -flush Iptables are a packet filtering system on linux. ![]() Deleting the entire iptables is called flushing it. iptables -F (or) iptables flush service iptables save 2. sudo iptables -D INPUT 3 This would mean the third rule in the input table. 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. Use the iptables flush command as shown below to do this. 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. I can't afford to just drop all rules and reinsert them, because this is simply too slow. I have a lot of sensitive traffic, like E1 lines encapsulated into IP packets and many others. I think they may man something like: Removing all firewall rules, and then adding them back. ![]() Unlike iptables, updates can take effect. This approach works well, to some extent. They could be specifically referring to a function of something that is part of iptables, or they could just be using the word flush as a somewhat generic term to mean something like restart/reboot. iptables flush the entire rules set each time a change is made unlike firewalld. You also need to zero the packet and byte counters in all chains by pasing the -zero or option. This is equivalent to deleting all the iptables rules one by one on Linux. I have a script which simply flushes all rules and custom chains, then reloads everything from scratch. Procedure to flush and delete ALL iptables firewall rules To flush the selected chain (or all the chains in the table if none is given) pass the -flush or -F option. 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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