I think you mean -P OUTPUT(or whatever) DROP(This has to be a built-in target). 
 If you do want to
append a blank rule to be a sudo policy, then I say go with the first as it's 
more flexable.  Keep
inmind that any other appended(-A) rule will not be called.

I put up a script that helps sort throught all this -A and -I trash.
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=192235

--- Bjoern Schmidt <[EMAIL PROTECTED]> wrote:
> Do i really need the last three iptables calls? I think
> they do the same like the first five calls and could be removed,
> but i am not sure...
> 
> 
> finish_rules()
> {
>       iptables -N CATCH-ALL
>       iptables -A OUTPUT     -j CATCH-ALL     
>       iptables -A INPUT      -j CATCH-ALL
>       iptables -A FORWARD    -j CATCH-ALL
>       iptables -A CATCH-ALL  -j DROP
> 
>       iptables -A INPUT      -j DROP
>       iptables -A OUTPUT     -j DROP
>       iptables -A FORWARD    -j DROP
> }
> 
> -- 
> Greetings
> Bjoern Schmidt
> 


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