my mean to that can we use the following step in the RHCE exam when we are configuring the ftp server
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"iptables -I INPUT -s 192.168.0.0/24 -p tcp --dport 21 -j ACCEPT"
"iptables -I INPUT -s 192.168.0.0/24 -p udp --dport 21 -j ACCEPT"
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