Re: Redhat Linux 8.0 IPtables help

["Dharmendra.T" <dharmu@nsecure.net>]

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On Fri, 2003-06-06 at 01:02, Sundaram Ramasamy wrote:

    Hi,
    
    
    
    I have Linux machine with single Network interface. I want to block all the
    tcp,udp and icmp port's other then 22,23,24 and 80.
    
    
    
    Can you verify the following script?
    
    
    
    
    
    IPTABLES=/sbin/iptables
    
    
    
    $IPTABLES -P INPUT DROP
    $IPTABLES -P OUTPUT DROP
    $IPTABLES -P FORWARD DROP
    
    $IPTABLES -A INPUT -p tcp -m multiport --destination-port 22,23,24,80 -j
    ACCEPT
    
    
    
    $IPTABLES -A INPUT -p udp -m multiport --destination-port 22,23,24,80 -j
    ACCEPT
    
    
    
    
    
    What port should I block for icmp protocol?
    
    
    
    -SR
    
    	You have to add the following rules to enable the communication.
    

$IPTABLES -A OUTPUT -p tcp -m multiport --source-port 22,23,24,80 -j
ACCEPT
$IPTABLES -A OUTPUT -p udp -m multiport --source-port 22,23,24,80 -j
ACCEPT


-- 
Regards
Dharmendra.T


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