iptables Bastille not blocking

[wpwood3]

I'm trying do some local testing with iptables and am having a problem...

My ISPConfig server is on 10.0.0.6
My laptop is on 10.0.0.21

I want to block all access from my laptop to my ISPConfig server.

I entered these commands on my ISPConfig server:

 
iptables -A INPUT -s 10.0.0.21 -j DROP
iptables -A OUTPUT -d 10.0.0.21 -j DROP

When I do "iptables -L" I can clearly see the new rules are there.

The problem is that I can still access the server from my laptop. iptables is not blocking anything.
What am I missing?

[wpwood3]

You have to use -I instead of -A
Like this:

iptables -I INPUT -s 10.0.0.21 -j DROP
iptables -I OUTPUT -d 10.0.0.21 -j DROP

Using -I puts the rule at the top of the list so it gets processed first and cannot be overridden by later rules.