\u73a9\u4e865\u5e74\u7684linux\uff0c\u6ca1\u6709\u7ed9\u670d\u52a1\u5668\u52a0\u4e0a\u9632\u706b\u5899\uff0c\u4eca\u5929google\u4e86\u4e00\u4e0b\uff0c\u6574\u4e86\u4e2a\u4e1c\u897f\u51fa\u6765<\/p>\n
iptables \u2013L<\/pre>\n<\/p>\n
\u8f93\u51fa\u4fe1\u606f\u7c7b\u4f3c\u4e8e\uff1a<\/p>\n
Chain INPUT (policy ACCEPT)\ntarget prot opt source destination\n\nChain FORWARD (policy ACCEPT)\ntarget prot opt source destination\n\nChain OUTPUT (policy ACCEPT)\ntarget prot opt source destination<\/pre>\n\u8fd9\u8868\u660e\u4efb\u4f55\u4eba\u53ef\u4ee5\u4ece\u4efb\u4f55\u5730\u65b9\u8bbf\u95ee\u3002<\/p>\n
\u4fdd\u5b58iptables\u89c4\u5219\u5230\u6587\u4ef6<\/h2>\n
\u5efa\u7acb\u4e00\u4e2a\u6d4b\u8bd5iptables\u6587\u4ef6<\/p>\n
vi \/etc\/iptables.rules<\/pre>\n\u5728\u8fd9\u4e2a\u6587\u4ef6\u5199\u5165\u4e00\u4e0b\u7b80\u5355\u7684\u89c4\u5219 <\/p>\n
*filter\n\n# Remove all rules\n-F\n\n# Allows all loopback (lo0) traffic\n-A INPUT -i lo -j ACCEPT\n\n# Accepts all established inbound connections\n-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT\n-A FORWARD -i eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT\n-A OUTPUT -m state --state NEW,RELATED,ESTABLISHED -j ACCEPT\n\n# Allows all outbound traffic\n# You could modify this to only allow certain traffic\n-A OUTPUT -j ACCEPT\n\n# Allows HTTP and HTTPS connections from anywhere\n-A INPUT -p tcp --dport 80 -j ACCEPT\n-A INPUT -p tcp --dport 443 -j ACCEPT\n\n# Allows SSH connections for script kiddies\n-A INPUT -p tcp -m state --state NEW --dport 22 -j ACCEPT\n\n# Allows MYSQL (Allow Remote Access To Particular IP):\n-A INPUT -p tcp --dport 3306 -j ACCEPT\n\n# Allows FTP Active mode\n-A INPUT -p tcp --dport 20:21 -j ACCEPT\n\n# Passive FTP Ports Maybe: (Again, specifying ports 50000 through 50050 in one rule)\n-A INPUT -p tcp --dport 50000:50050 -j ACCEPT\n\n# Allow ping\n-A INPUT -p icmp -m icmp --icmp-type 8 -j ACCEPT\n\n# log iptables denied calls (access via 'dmesg' command)\n-A INPUT -m limit --limit 5\/min -j LOG --log-prefix \"iptables denied: \" --log-level 7\n\n# Reject all other inbound - default deny unless explicitly allowed policy:\n-A INPUT -j REJECT\n-A FORWARD -j REJECT\n\nCOMMIT<\/pre>\n\u8fd9\u4e2a\u770b\u8d77\u6765\u6709\u70b9\u590d\u6742\uff0c\u4f46\u662f\u6bcf\u6b21\u770b\u4e00\u8282\uff0c\u4f60\u4f1a\u53d1\u73b0\u9664\u4e86\u6211\u4eec\u5141\u8bb8\u7684\u7aef\u53e3\uff0c\u5176\u4ed6\u6240\u6709\u7aef\u53e3\u90fd\u88ab\u5173\u95ed\u4e86\u3002<\/p>\n
\u542f\u7528\u8fd9\u4e9b\u65b0\u7684\u89c4\u5219<\/p>\n
iptables-restore < \/etc\/iptables.rules <\/pre>\n\u5728\u770b\u770b\u4e0d\u540c<\/p>\n
iptables -L<\/pre>\n\u4f60\u4e5f\u53ef\u4ee5\u4fdd\u5b58\u8fd9\u4e9b\u89c4\u5219\u5230\u6587\u4ef6<\/p>\n
\u786e\u4fdd\u5728\u91cd\u542f\u540e\u8fd9\u4e9biptables\u89c4\u5219\u751f\u6548\uff0c\u5efa\u7acb\u65b0\u6587\u4ef6<\/p>\n
vi \/etc\/network\/if-pre-up.d\/iptables<\/pre>\n\u589e\u52a0\u5982\u4e0b\u5185\u5bb9<\/p>\n
#!\/bin\/sh\n\/sbin\/iptables-restore < \/etc\/iptables.rules<\/pre>\n<\/p>\n
\u8fd9\u4e2a\u6587\u4ef6\u9700\u8981\u53ef\u6267\u884c<\/p>\n
chmod +x \/etc\/network\/if-pre-up.d\/iptables<\/pre>\n\u53c2\u8003<\/h2>\n