iptables block access to port 8000 except from IP address

Question

I ve never used iptables  and the documentation online seems a bit opaque   I d like to block all requests to port 8000 on my server except those coming from a specific IP address  How do I do that using iptables

User · Accepted Answer

This question should be on Server Fault   Nevertheless  the following should do the trick  assuming you re talking about TCP and the IP you want to allow is 1 2 3 4   iptables -A INPUT -p tcp --dport 8000 -s 1 2 3 4 -j ACCEPT iptables -A INPUT -p tcp --dport 8000 -j DROP

User · Answer

Another alternative is   sudo iptables -A INPUT -p tcp --dport 8000 -s   1 2 3 4 -j DROP   I had similar issue that 3 bridged virtualmachine just need access eachother with different combination  so I have tested this command and it works well   Edit       According to Fernando comment and this link exclamation mark       will be placed before than -s parameter    sudo iptables -A INPUT -p tcp --dport 8000   -s 1 2 3 4 -j DROP

User · Answer

You can always use iptables to delete the rules   If you have a lot of rules  just output them using the following command   iptables-save  gt  myfile   vi to edit them from the commend line   Just use the  dd  to delete the lines you no longer want   iptables-restore  lt  myfile and you re good to go      REMEMBER THAT IF YOU DON T CONFIGURE YOUR OS TO SAVE THE RULES TO A FILE AND THEN LOAD THE FILE DURING THE BOOT THAT YOUR RULES WILL BE LOST

[firewall] iptables block access to port 8000 except from IP address

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