请问下 iptables 禁止所有入站,再开启入站的问题...

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iptables -P INPUT DROP
iptables -I INPUT -p tcp -m multiport --dports 22,80,443,1723 -j ACCEPT
iptables -I INPUT -p udp --dport 53 -j ACCEPT

连SSH都无法连接,命令该怎么修正?

Supplement 1 · Jun 18, 2015

服务器ping都ping不到

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iptables input udp