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 spec

Answer 1

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