iptablesの設定例

Linux

iptablesの設定例をいくつかメモしておく

※sshのポート番号のところは、22で統一しています。

CentOSをサーバーとして活用するための基本的な設定 - さくらインターネット創業日記
http://tanaka.sakura.ad.jp/archives/001065.html

*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:RH-Firewall-1-INPUT - [0:0]
-A INPUT -j RH-Firewall-1-INPUT
-A FORWARD -j RH-Firewall-1-INPUT
-A RH-Firewall-1-INPUT -i lo -j ACCEPT
-A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT
-A RH-Firewall-1-INPUT -p 50 -j ACCEPT
-A RH-Firewall-1-INPUT -p 51 -j ACCEPT
-A RH-Firewall-1-INPUT -p udp --dport 5353 -d 224.0.0.251 -j ACCEPT
-A RH-Firewall-1-INPUT -p udp -m udp --dport 631 -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m tcp --dport 631 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
-A RH-Firewall-1-INPUT -s 210.224.160.0.0/19 -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
-A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited
COMMIT

#10 ファイアーウォールの設定をしよう | さくらのVPS入門 - プログラミングならドットインストール
http://dotinstall.com/lessons/basic_sakura_vps/8010

*filter 
:INPUT DROP [0:0] 
:FORWARD DROP [0:0] 
:OUTPUT ACCEPT [0:0] 
:SERVICES - [0:0] 
-A INPUT -i lo -j ACCEPT 
-A INPUT -p icmp --icmp-type echo-request -m limit --limit 1/s --limit-burst 4 -j ACCEPT 
-A INPUT -p tcp -m state --state ESTABLISHED,RELATED -j ACCEPT 
-A INPUT -p tcp -m state --state NEW -j SERVICES 
-A INPUT -p udp --sport 53 -j ACCEPT 
-A INPUT -p udp --sport 123 --dport 123 -j ACCEPT 
-A SERVICES -p tcp --dport 22 -j ACCEPT 
-A SERVICES -p tcp --dport 80 -j ACCEPT 
-A SERVICES -p tcp --dport 443 -j ACCEPT 
COMMIT

ConoHaの登録後のiptablesの状態

*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT

ServersMan@VPSの登録後のiptablesの状態

*nat
:PREROUTING ACCEPT [0:0]
:POSTROUTING ACCEPT [53:3290]
:OUTPUT ACCEPT [53:3290]
COMMIT

*mangle
:PREROUTING ACCEPT [128:20100]
:INPUT ACCEPT [128:20100]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [161:9120]
:POSTROUTING ACCEPT [161:9120]
COMMIT

*filter
:INPUT ACCEPT [128:20100]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [161:9120]
COMMIT