Re: Iptables ACCEPT and DROP

["IT Clown" <iptables@mailbox.co.za>]

will the following help:


iptables -A INPUT -i eth0 -p tcp -s 216.155.193.168 --sport
5050 -j DROP
iptables -A OUTPUT -o eth0 -p tcp -d 216.155.193.168
--dport 5050 -j DROP

service iptables stop
/etc/init.d/iptables stop
iptables -F
service iptables start
/etc/init.d/iptables start

or am i missing it completely?

Regards

On Fri, 16 Apr 2004 10:43:07 -0700
 "Ravi Verma" <ravi.verma@telecommand.com> wrote:
> Dear Friends:
> 
> I have observe a behavior of iptables which I need to
> understand.
> 
> 216.155.193.168 is the IP address of Yahoo's messenger
> site and it
> listens on port 5050.
> 
> The following command will allows the machine to connect
> to
> 216.155.193.168.
> 
> iptables -A OUTPUT -o eth0 -p tcp -d 216.155.193.168
> --dport 5050 -j
> ACCEPT
> 
> After that, I see output like following:
> 
> #telnet 216.155.193.168 5050
> Trying 216.155.193.168...
> Connected to 216.155.193.168.
> Escape character is '^]'.
> 
> Now when I issue
> iptables -A OUTPUT -o eth0 -p tcp -d 216.155.193.168
> --dport 5050 -j
> DROP
> And
> iptables -A OUTPUT -o eth0 -p tcp -d 216.155.193.168
> --dport 5050 -j
> REJECT
> 
> Still, it allows connection to 216.155.193.168 on port
> 5050.
> 
> How does this work? It seems -j DROP is not opposite of
> -j ACCEPT. How
> can stop this?
> 
> Kind regards.
> 
> Ravi Verma
> 
> 

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