我使用这些命令来阻止所有端口并只允许某些特定端口。
iptables -F
iptables -X
iptables -P OUTPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT
iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
iptables -A OUTPUT -m conntrack --ctstate NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
iptables -A FORWARD -j ACCEPT
/sbin/iptables -A INPUT -p tcp --dport 22 -j ACCEPT
/sbin/iptables -A OUTPUT -p tcp --sport 22 -j ACCEPT
/sbin/iptables -A INPUT …我无法同步我的 archlinux。当我尝试使用pacman它时，得到这个：
ThinkPad-de-Micael_Andre% sudo pacman -Syu
[sudo] password for dmicaelandre:
Sorry, try again.
[sudo] password for dmicaelandre:
:: Synchronizing package databases...
error: failed to update core (unable to lock database)
error: failed to update extra (unable to lock database)
error: failed to update community (unable to lock database)
error: failed to update multilib (unable to lock database)
error: failed to update archlinuxfr (unable to lock database)
error: failed to update blackarch (unable to lock database)
error: failed to …