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伺服器更改預設埠22

1.  iptables-save >/etc/iptables.up.rules

2.  echo -e '\npre-up iptables-restore </etc/iptables.up.rules\npost-down iptables-save > /etc/iptables.up.rules'>>/etc/network/interfaces

3.  chmod +x /etc/network/interfaces