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clearing_iptables

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clearing_iptables [2023/05/08 04:23] – -Clarity-intro, formatting hogwildclearing_iptables [2024/10/31 21:09] (current) – hogwild
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-===== Clearing iptables custom commands prior to re-applying new ones =====+===== Clearing iptables custom commands prior to applying new ones =====
  
-Let's say, for example, you want to use some custom iptables commands in a script/the firewall. This could actually apply to any recurring script (such as WAN Up).+As an example, let's say that you wanted to use some custom iptables commands in a script, such as the firewall script. (Actually, the following principles would apply to any recurring script, such as "WAN Up").
  
-You can remove what previously added iptables directive with a simple approach:+ \\ You can remove previously-added iptables directives using a simple approach:
  
  \\  \\
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  \\  \\
  
-This command here below will check what iptables **-A** (append) or **-I** (insert) have been used in the current Script/Firewall text area and force a run of the same command replacing any **-A** or **-I** with a **-D** (Delete) essentially removing any user added iptables directive. To be noted that for advanced iptables commands a user might have created custom tables, this is usually achieved via "**-N**" (new). You can apply the same principle as per above looking for **-N**. Do remember that:+The commands below will check what iptables **-A** (append) or **-I** (insert) directives have been issued previously in the current Script/Firewall text. They will then force a run of the same command, replacing any instance of **-A** or **-I** with a **-D** (Delete) command. In essence, this will reverse/remove any previous user-added iptables directives.
  
-  * you need to un-reference the custom table from the built in one first (as per approach above) +You might have created custom tables in which to use advanced iptables commands. This is usually performed using the "**-N**" (new) command. The same principles described above will also apply to previously-issued directives which used the **-N command**. 
-  * a table needs to be empties with **-F** (Flush) first e.g. **iptables -F $TABLE_NAME** + 
-  * only at this point you will be allowed to remove the table with a **iptables -X $TABLE_NAME**.+ \\ Here are a few rules to remember when using these commands: 
 + 
 + \\ 
 + 
 +  * First, you need to dereference the custom table from the built-in one, \\ using the above method. 
 +  * A table must then be emptied with the **-F** (Flush) switch/parameter \\ (for example: "**iptables -F $TABLE_NAME") **. 
 +  * Only then will you be allowed to remove the table by using the command: \\ "**iptables -X $TABLE_NAME"**. 
 + 
 + \\
  
  
clearing_iptables.1683516211.txt.gz · Last modified: by hogwild

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