遮蔽埠 iptables 規則

weixin_34205076發表於2017-11-12

遮蔽埠 iptables 規則

我們僅需保留 SSH，SQL，DNS，HTTP 和 HTTPS 這些主要埠，其它的用 iptables 做下限制，這樣就高枕無憂了。

環回網路

iptables -A OUTPUT -o lo -j ACCEPT 
iptables -A INPUT -i lo -j ACCEPT

DNS

iptables -A OUTPUT -p udp –sport 53 -j ACCEPT
iptables -A INPUT -p udp –dport 53 -j ACCEPT

網頁 - SQL

iptables -A OUTPUT -p tcp -m multiport –dport 80,443,3306 -j ACCEPT
iptables -A INPUT -p tcp -m multiport –sport 80,443,3306 -j ACCEPT

代理 - SSH

iptables -A OUTPUT -p tcp -m multiport –sport 1080,22 -j ACCEPT
iptables -A INPUT -p tcp -m multiport –dport 1080,22 -j ACCEPT

使用者

iptables -A OUTPUT -p tcp –sport 50000:60000 -j ACCEPT
iptables -A OUTPUT -p udp –sport 50000:60000 -j ACCEPT
iptables -A INPUT -p tcp –dport 50000:60000 -j ACCEPT
iptables -A INPUT -p udp –dport 50000:60000 -j ACCEPT

連線數

iptables -A OUTPUT -p tcp –sport 50000:60000 -m connlimit –connlimit-above 20 -j REJECT –reject-with tcp-reset
iptables -A INPUT -p tcp –dport 50000:60000 -m connlimit –connlimit-above 20 -j REJECT –reject-with tcp-reset

其他

iptables -A OUTPUT -p icmp -j ACCEPT
iptables -A INPUT -p icmp -j ACCEPT

禁止

iptables -P OUTPUT DROP
iptables -P INPUT DROP
iptables -P FORWARD DROP

遮蔽其他埠

iptables -A OUTPUT -p tcp -m multiport –dport 21,22,23 -j REJECT –reject-with tcp-reset
iptables -A OUTPUT -p udp -m multiport –dport 21,22,23 -j DROP

遮蔽郵箱埠

iptables -A OUTPUT -p tcp -m multiport –dport 24,25,50,57,105,106,109,110,143,158,209,218,220,465,587 -j REJECT –reject-with tcp-reset
iptables -A OUTPUT -p tcp -m multiport –dport 993,995,1109,24554,60177,60179 -j REJECT –reject-with tcp-reset
iptables -A OUTPUT -p udp -m multiport –dport 24,25,50,57,105,106,109,110,143,158,209,218,220,465,587 -j DROP
iptables -A OUTPUT -p udp -m multiport –dport 993,995,1109,24554,60177,60179 -j DROP


 本文轉自 技術花妞妞 51CTO部落格，原文連結:http://blog.51cto.com/xiaogongju/2060962


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