我想基本上丢弃所有的数据包，但仍然允许端口22,80和52533.目前，这个防火墙不允许ping，或者我使用yum update 。 我如何添加？ 另外，有没有更简单的方法来打开端口80？ 目前的规则似乎有点冗长。
#!/bin/sh # # Flush all current rules from iptables # iptables -F iptables -t nat -F # # Allow SSH connections on tcp port 22 # iptables -A INPUT -i eth0 -p tcp --dport 22 -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --sport 22 -j ACCEPT # # Open port 80 # iptables -A INPUT -p tcp -s 0/0 --sport 1024:65535 -d 209.177.156.154 --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -p tcp -s 209.177.156.154 --sport 80 -d 0/0 --dport 1024:65535 -m state --state ESTABLISHED -j ACCEPT # # Set access for localhost # iptables -A INPUT -i lo -j ACCEPT # # Accept connections on 1195 for vpn access from client # iptables -A INPUT -i eth0 -p udp --dport 1195 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p udp --sport 1195 -m state --state ESTABLISHED -j ACCEPT # # Apply forwarding # iptables -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT iptables -A FORWARD -s 10.8.0.0/24 -j ACCEPT iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to 209.177.156.154 iptables -A FORWARD -j REJECT # # Enable forwarding # echo 1 > /proc/sys/net/ipv4/ip_forward # # PREROUTE ports # iptables -t nat -A PREROUTING -p udp -m multiport --dports 10001:65535 -j REDIRECT --to-ports 52533 # # Set default policies for INPUT, FORWARD and OUTPUT chains # iptables -P INPUT DROP iptables -P FORWARD DROP iptables -P OUTPUT DROP # # IPv6 configuration # ip6tables -F INPUT ip6tables -F FORWARD ip6tables -F OUTPUT ip6tables -F echo -n "1" >/proc/sys/net/ipv6/conf/all/forwarding echo -n "1" >/proc/sys/net/ipv6/conf/all/proxy_ndp echo -n "0" >/proc/sys/net/ipv6/conf/all/autoconf echo -n "0" >/proc/sys/net/ipv6/conf/all/accept_ra ip6tables -A INPUT -p icmpv6 -j ACCEPT ip6tables -A FORWARD -m state --state NEW -i tun0 -o eth0 -s 2607:f740:101:f::/64 -j ACCEPT ip6tables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT ip6tables -P INPUT DROP ip6tables -P FORWARD DROP ip6tables -P OUTPUT DROP
允许输出HTTP连接：
首先允许build立到远程端口的连接：
iptables -A OUTPUT -p tcp --destination-port 80 -j ACCEPT
并接受build立的会议：
iptables -A INPUT -p tcp --source-port 80 -m state --state ESTABLISHED,RELATED -j ACCEPT
不要忘记允许DNS连接（即8.8.8.8）：
iptables -A INPUT -p udp --source-port 53 -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A OUTPUT -d 8.8.8.8 -p udp --destination-port 53 -j ACCEPT
接受所有ICMP：
iptables -A INPUT -p icmp -j ACCEPT iptables -A OUTPUT -p icmp -j ACCEPT