[Gllug] iptables - a quick question

[will]

I have installed iptables!  Yay!

Basically I wanted to firewall port 6000 and after much faffing, i have 
the following two rules (don't ask me why there are two):

DROP       tcp  --  anywhere             anywhere           tcp dpt:x11
DROP       tcp  --  anywhere             anywhere           tcp dpt:x11 
flags:SYN,RST,ACK/SYN

I am guessing one is redundant, but which one?  as in, which one blocks 
incoming connections most comprehensively to port 6000?

Also, when I nmap the machine the port shows up as being filtered.  Is 
this secure or can people still somehow open up a connection to the port?

Will.


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