\u5982\u679c\u4f60\u7684IPTABLES\u57fa\u7840\u77e5\u8bc6\u8fd8\u4e0d\u4e86\u89e3,\u5efa\u8bae\u5148\u53bb\u770b\u770b\u3002 <\/p>\n
\u6211\u4eec\u6765\u914d\u7f6e\u4e00\u4e2afilter\u8868\u7684\u9632\u706b\u5899<\/p>\n
1\u3001\u67e5\u770b\u672c\u673a\u5173\u4e8eIPTABLES\u7684\u8bbe\u7f6e\u60c5\u51b5<\/p>\n
[root@tp ~]# iptables -L -n<\/p>\n
Chain INPUT (policy ACCEPT)<\/p>\n
target prot opt source destination<\/p>\n
Chain FORWARD (policy ACCEPT)<\/p>\n
target prot opt source destination<\/p>\n
Chain OUTPUT (policy ACCEPT)<\/p>\n
target prot opt source destination<\/p>\n
Chain RH-Firewall-1-INPUT (0 references)<\/p>\n
target prot opt source destination<\/p>\n
ACCEPT all — 0.0.0.0\/0 0.0.0.0\/0<\/p>\n
ACCEPT icmp — 0.0.0.0\/0 0.0.0.0\/0 icmp type 255<\/p>\n
ACCEPT esp — 0.0.0.0\/0 0.0.0.0\/0<\/p>\n
ACCEPT ah — 0.0.0.0\/0 0.0.0.0\/0<\/p>\n
ACCEPT udp — 0.0.0.0\/0 224.0.0.251 udp dpt:5353<\/p>\n
ACCEPT udp — 0.0.0.0\/0 0.0.0.0\/0 udp dpt:631<\/p>\n
ACCEPT all — 0.0.0.0\/0 0.0.0.0\/0 state RELATED,ESTABLISHED<\/p>\n
ACCEPT tcp — 0.0.0.0\/0 0.0.0.0\/0 state NEW tcp dpt:22<\/p>\n
ACCEPT tcp — 0.0.0.0\/0 0.0.0.0\/0 state NEW tcp dpt:80<\/p>\n
ACCEPT tcp — 0.0.0.0\/0 0.0.0.0\/0 state NEW tcp dpt:25<\/p>\n
REJECT all — 0.0.0.0\/0 0.0.0.0\/0 reject-with icmp-host-prohibited<\/p>\n
\u53ef\u4ee5\u770b\u51fa\u6211\u5728\u5b89\u88c5linux\u65f6,\u9009\u62e9\u4e86\u6709\u9632\u706b\u5899,\u5e76\u4e14\u5f00\u653e\u4e8622,80,25\u7aef\u53e3.<\/p>\n
\u5982\u679c\u4f60\u5728\u5b89\u88c5linux\u65f6\u6ca1\u6709\u9009\u62e9\u542f\u52a8\u9632\u706b\u5899,\u662f\u8fd9\u6837\u7684<\/p>\n
[root@tp ~]# iptables -L -n<\/p>\n
Chain INPUT (policy ACCEPT)<\/p>\n
target prot opt source destination<\/p>\n
Chain FORWARD (policy ACCEPT)<\/p>\n
target prot opt source destination<\/p>\n
Chain OUTPUT (policy ACCEPT)<\/p>\n
target prot opt source destination<\/p>\n
\u4ec0\u4e48\u89c4\u5219\u90fd\u6ca1\u6709.<\/p>\n
2\u3001\u6e05\u9664\u539f\u6709\u89c4\u5219.<\/p>\n
\u4e0d\u7ba1\u4f60\u5728\u5b89\u88c5linux\u65f6\u662f\u5426\u542f\u52a8\u4e86\u9632\u706b\u5899,\u5982\u679c\u4f60\u60f3\u914d\u7f6e\u5c5e\u4e8e\u81ea\u5df1\u7684\u9632\u706b\u5899,\u90a3\u5c31\u6e05\u9664\u73b0\u5728filter\u7684\u6240\u6709\u89c4\u5219.<\/p>\n
[root@tp ~]# iptables -F \u6e05\u9664\u9884\u8bbe\u8868filter\u4e2d\u7684\u6240\u6709\u89c4\u5219\u94fe\u7684\u89c4\u5219<\/p>\n
[root@tp ~]# iptables -X \u6e05\u9664\u9884\u8bbe\u8868filter\u4e2d\u4f7f\u7528\u8005\u81ea\u5b9a\u94fe\u4e2d\u7684\u89c4\u5219<\/p>\n
\u6211\u4eec\u5728\u6765\u770b\u4e00\u4e0b<\/p>\n
[root@tp ~]# iptables -L -n<\/p>\n
Chain INPUT (policy ACCEPT)<\/p>\n
target prot opt source destination<\/p>\n
Chain FORWARD (policy ACCEPT)<\/p>\n
target prot opt source destination<\/p>\n
Chain OUTPUT (policy ACCEPT)<\/p>\n
target prot opt source destination<\/p>\n
\u4ec0\u4e48\u90fd\u6ca1\u6709\u4e86\u5427,\u548c\u6211\u4eec\u5728\u5b89\u88c5linux\u65f6\u6ca1\u6709\u542f\u52a8\u9632\u706b\u5899\u662f\u4e00\u6837\u7684.(\u63d0\u524d\u8bf4\u4e00\u53e5,\u8fd9\u4e9b\u914d\u7f6e\u5c31\u50cf\u7528\u547d\u4ee4\u914d\u7f6eIP\u4e00\u6837,\u91cd\u8d77\u5c31\u4f1a\u5931\u53bb\u4f5c\u7528),\u600e\u4e48\u4fdd\u5b58.<\/p>\n
[root@tp ~]# \/etc\/rc.d\/init.d\/iptables save<\/p>\n
\u8fd9\u6837\u5c31\u53ef\u4ee5\u5199\u5230\/etc\/sysconfig\/iptables\u6587\u4ef6\u91cc\u4e86.\u5199\u5165\u540e\u8bb0\u5f97\u628a\u9632\u706b\u5899\u91cd\u8d77\u4e00\u4e0b,\u624d\u80fd\u8d77\u4f5c\u7528.<\/p>\n
[root@tp ~]# service iptables restart<\/p>\n
\u73b0\u5728IPTABLES\u914d\u7f6e\u8868\u91cc\u4ec0\u4e48\u914d\u7f6e\u90fd\u6ca1\u6709\u4e86,\u90a3\u6211\u4eec\u5f00\u59cb\u6211\u4eec\u7684\u914d\u7f6e\u5427\u3002<\/p>\n
3\u3001\u8bbe\u5b9a\u9884\u8bbe\u89c4\u5219<\/p>\n
[root@tp ~]# iptables -p INPUT DROP<\/p>\n
[root@tp ~]# iptables -p OUTPUT ACCEPT<\/p>\n
[root@tp ~]# iptables -p FORWARD DROP<\/p>\n
\u4e0a\u9762\u7684\u610f\u601d\u662f,\u5f53\u8d85\u51fa\u4e86IPTABLES\u91ccfilter\u8868\u91cc\u7684\u4e24\u4e2a\u94fe\u89c4\u5219(INPUT,FORWARD)\u65f6,\u4e0d\u5728\u8fd9\u4e24\u4e2a\u89c4\u5219\u91cc\u7684\u6570\u636e\u5305\u600e\u4e48\u5904\u7406\u5462,\u90a3\u5c31\u662fDROP(\u653e\u5f03).\u5e94\u8be5\u8bf4\u8fd9\u6837\u914d\u7f6e\u662f\u5f88\u5b89\u5168\u7684.\u6211\u4eec\u8981\u63a7\u5236\u6d41\u5165\u6570\u636e\u5305<\/p>\n
\u800c\u5bf9\u4e8eOUTPUT\u94fe,\u4e5f\u5c31\u662f\u6d41\u51fa\u7684\u5305\u6211\u4eec\u4e0d\u7528\u505a\u592a\u591a\u9650\u5236,\u800c\u662f\u91c7\u53d6ACCEPT,\u4e5f\u5c31\u662f\u8bf4,\u4e0d\u5728\u7740\u4e2a\u89c4\u5219\u91cc\u7684\u5305\u600e\u4e48\u529e\u5462,\u90a3\u5c31\u662f\u901a\u8fc7.<\/p>\n
\u53ef\u4ee5\u770b\u51faINPUT,FORWARD\u4e24\u4e2a\u94fe\u91c7\u7528\u7684\u662f\u5141\u8bb8\u4ec0\u4e48\u5305\u901a\u8fc7,\u800cOUTPUT\u94fe\u91c7\u7528\u7684\u662f\u4e0d\u5141\u8bb8\u4ec0\u4e48\u5305\u901a\u8fc7.<\/p>\n
\u8fd9\u6837\u8bbe\u7f6e\u8fd8\u662f\u633a\u5408\u7406\u7684,\u5f53\u7136\u4f60\u4e5f\u53ef\u4ee5\u4e09\u4e2a\u94fe\u90fdDROP,\u4f46\u8fd9\u6837\u505a\u6211\u8ba4\u4e3a\u662f\u6ca1\u6709\u5fc5\u8981\u7684,\u800c\u4e14\u8981\u5199\u7684\u89c4\u5219\u5c31\u4f1a\u589e\u52a0.\u4f46\u5982\u679c\u4f60\u53ea\u60f3\u8981\u6709\u9650\u7684\u51e0\u4e2a\u89c4\u5219\u662f,\u5982\u53ea\u505aWEB\u670d\u52a1\u5668.\u8fd8\u662f\u63a8\u8350\u4e09\u4e2a\u94fe\u90fd\u662fDROP.<\/p>\n
\u6ce8:\u5982\u679c\u4f60\u662f\u8fdc\u7a0bSSH\u767b\u9646\u7684\u8bdd,\u5f53\u4f60\u8f93\u5165\u7b2c\u4e00\u4e2a\u547d\u4ee4\u56de\u8f66\u7684\u65f6\u5019\u5c31\u5e94\u8be5\u6389\u4e86.\u56e0\u4e3a\u4f60\u6ca1\u6709\u8bbe\u7f6e\u4efb\u4f55\u89c4\u5219.<\/p>\n
\u600e\u4e48\u529e,\u53bb\u672c\u673a\u64cd\u4f5c\u5457!<\/p>\n
4\u3001\u6dfb\u52a0\u89c4\u5219.<\/p>\n
\u9996\u5148\u6dfb\u52a0INPUT\u94fe,INPUT\u94fe\u7684\u9ed8\u8ba4\u89c4\u5219\u662fDROP,\u6240\u4ee5\u6211\u4eec\u5c31\u5199\u9700\u8981ACCETP(\u901a\u8fc7)\u7684\u94fe<\/p>\n
\u4e3a\u4e86\u80fd\u91c7\u7528\u8fdc\u7a0bSSH\u767b\u9646,\u6211\u4eec\u8981\u5f00\u542f22\u7aef\u53e3.<\/p>\n
[root@tp ~]# iptables -A INPUT -p tcp –dport 22 -j ACCEPT<\/p>\n
[root@tp ~]# iptables -A OUTPUT -p tcp –sport 22 -j ACCEPT (\u6ce8:\u8fd9\u4e2a\u89c4\u5219,\u5982\u679c\u4f60\u628aOUTPUT \u8bbe\u7f6e\u6210DROP\u7684\u5c31\u8981\u5199\u4e0a\u8fd9\u4e00\u90e8,\u597d\u591a\u4eba\u90fd\u662f\u671b\u4e86\u5199\u8fd9\u4e00\u90e8\u89c4\u5219\u5bfc\u81f4,\u59cb\u7ec8\u65e0\u6cd5SSH.\u5728\u8fdc\u7a0b\u4e00\u4e0b,\u662f\u4e0d\u662f\u597d\u4e86.<\/p>\n
\u5176\u4ed6\u7684\u7aef\u53e3\u4e5f\u4e00\u6837,\u5982\u679c\u5f00\u542f\u4e86web\u670d\u52a1\u5668,OUTPUT\u8bbe\u7f6e\u6210DROP\u7684\u8bdd,\u540c\u6837\u4e5f\u8981\u6dfb\u52a0\u4e00\u6761\u94fe:<\/p>\n
[root@tp ~]# iptables -A OUTPUT -p tcp –sport 80 -j ACCEPT ,\u5176\u4ed6\u540c\u7406.)<\/p>\n
\u5982\u679c\u505a\u4e86WEB\u670d\u52a1\u5668,\u5f00\u542f80\u7aef\u53e3.<\/p>\n
[root@tp ~]# iptables -A INPUT -p tcp –dport 80 -j ACCEPT<\/p>\n
\u5982\u679c\u505a\u4e86\u90ae\u4ef6\u670d\u52a1\u5668,\u5f00\u542f25,110\u7aef\u53e3.<\/p>\n
[root@tp ~]# iptables -A INPUT -p tcp –dport 110 -j ACCEPT<\/p>\n
[root@tp ~]# iptables -A INPUT -p tcp –dport 25 -j ACCEPT<\/p>\n
\u5982\u679c\u505a\u4e86FTP\u670d\u52a1\u5668,\u5f00\u542f21\u7aef\u53e3<\/p>\n
[root@tp ~]# iptables -A INPUT -p tcp –dport 21 -j ACCEPT<\/p>\n
[root@tp ~]# iptables -A INPUT -p tcp –dport 20 -j ACCEPT<\/p>\n
\u5982\u679c\u505a\u4e86DNS\u670d\u52a1\u5668,\u5f00\u542f53\u7aef\u53e3<\/p>\n
[root@tp ~]# iptables -A INPUT -p tcp –dport 53 -j ACCEPT<\/p>\n
\u5982\u679c\u4f60\u8fd8\u505a\u4e86\u5176\u4ed6\u7684\u670d\u52a1\u5668,\u9700\u8981\u5f00\u542f\u54ea\u4e2a\u7aef\u53e3,\u7167\u5199\u5c31\u884c\u4e86.<\/p>\n
\u4e0a\u9762\u4e3b\u8981\u5199\u7684\u90fd\u662fINPUT\u94fe,\u51e1\u662f\u4e0d\u5728\u4e0a\u9762\u7684\u89c4\u5219\u91cc\u7684,\u90fdDROP<\/p>\n
\u5141\u8bb8icmp\u5305\u901a\u8fc7,\u4e5f\u5c31\u662f\u5141\u8bb8ping,<\/p>\n
[root@tp ~]# iptables -A OUTPUT -p icmp -j ACCEPT (OUTPUT\u8bbe\u7f6e\u6210DROP\u7684\u8bdd)<\/p>\n
[root@tp ~]# iptables -A INPUT -p icmp -j ACCEPT (INPUT\u8bbe\u7f6e\u6210DROP\u7684\u8bdd)<\/p>\n
\u5141\u8bb8loopback!(\u4e0d\u7136\u4f1a\u5bfc\u81f4DNS\u65e0\u6cd5\u6b63\u5e38\u5173\u95ed\u7b49\u95ee\u9898)<\/p>\n
IPTABLES -A INPUT -i lo -p all -j ACCEPT (\u5982\u679c\u662fINPUT DROP)<\/p>\n
IPTABLES -A OUTPUT -o lo -p all -j ACCEPT(\u5982\u679c\u662fOUTPUT DROP)<\/p>\n
\u4e0b\u9762\u5199OUTPUT\u94fe,OUTPUT\u94fe\u9ed8\u8ba4\u89c4\u5219\u662fACCEPT,\u6240\u4ee5\u6211\u4eec\u5c31\u5199\u9700\u8981DROP(\u653e\u5f03)\u7684\u94fe.<\/p>\n
\u51cf\u5c11\u4e0d\u5b89\u5168\u7684\u7aef\u53e3\u8fde\u63a5<\/p>\n
[root@tp ~]# iptables -A OUTPUT -p tcp –sport 31337 -j DROP<\/p>\n
[root@tp ~]# iptables -A OUTPUT -p tcp –dport 31337 -j DROP<\/p>\n
\u6709\u4e9b\u4e9b\u7279\u6d1b\u4f0a\u6728\u9a6c\u4f1a\u626b\u63cf\u7aef\u53e331337\u523031340(\u5373\u9ed1\u5ba2\u8bed\u8a00\u4e2d\u7684 elite \u7aef\u53e3)\u4e0a\u7684\u670d\u52a1\u3002\u65e2\u7136\u5408\u6cd5\u670d\u52a1\u90fd\u4e0d\u4f7f\u7528\u8fd9\u4e9b\u975e\u6807\u51c6\u7aef\u53e3\u6765\u901a\u4fe1,\u963b\u585e\u8fd9\u4e9b\u7aef\u53e3\u80fd\u591f\u6709\u6548\u5730\u51cf\u5c11\u4f60\u7684\u7f51\u7edc\u4e0a\u53ef\u80fd\u88ab\u611f\u67d3\u7684\u673a\u5668\u548c\u5b83\u4eec\u7684\u8fdc\u7a0b\u4e3b\u670d\u52a1\u5668\u8fdb\u884c\u72ec\u7acb\u901a\u4fe1\u7684\u673a\u4f1a<\/p>\n
\u8fd8\u6709\u5176\u4ed6\u7aef\u53e3\u4e5f\u4e00\u6837,\u50cf:31335\u300127444\u300127665\u300120034 NetBus\u30019704\u3001137-139\uff08smb\uff09,2049(NFS)\u7aef\u53e3\u4e5f\u5e94\u88ab\u7981\u6b62,\u6211\u5728\u8fd9\u5199\u7684\u4e5f\u4e0d\u5168,\u6709\u5174\u8da3\u7684\u670b\u53cb\u5e94\u8be5\u53bb\u67e5\u4e00\u4e0b\u76f8\u5173\u8d44\u6599.<\/p>\n
\u5f53\u7136\u51fa\u5165\u66f4\u5b89\u5168\u7684\u8003\u8651\u4f60\u4e5f\u53ef\u4ee5\u5305OUTPUT\u94fe\u8bbe\u7f6e\u6210DROP,\u90a3\u4f60\u6dfb\u52a0\u7684\u89c4\u5219\u5c31\u591a\u4e00\u4e9b,\u5c31\u50cf\u4e0a\u8fb9\u6dfb\u52a0<\/p>\n
\u5141\u8bb8SSH\u767b\u9646\u4e00\u6837.\u7167\u7740\u5199\u5c31\u884c\u4e86.<\/p>\n
\u4e0b\u9762\u5199\u4e00\u4e0b\u66f4\u52a0\u7ec6\u81f4\u7684\u89c4\u5219,\u5c31\u662f\u9650\u5236\u5230\u67d0\u53f0\u673a\u5668<\/p>\n
\u5982:\u6211\u4eec\u53ea\u5141\u8bb8192.168.0.3\u7684\u673a\u5668\u8fdb\u884cSSH\u8fde\u63a5<\/p>\n
[root@tp ~]# iptables -A INPUT -s 192.168.0.3 -p tcp –dport 22 -j ACCEPT<\/p>\n
\u5982\u679c\u8981\u5141\u8bb8,\u6216\u9650\u5236\u4e00\u6bb5IP\u5730\u5740\u53ef\u7528 192.168.0.0\/24 \u8868\u793a192.168.0.1-255\u7aef\u7684\u6240\u6709IP.<\/p>\n
24\u8868\u793a\u5b50\u7f51\u63a9\u7801\u6570.\u4f46\u8981\u8bb0\u5f97\u628a \/etc\/sysconfig\/iptables \u91cc\u7684\u8fd9\u4e00\u884c\u5220\u4e86.<\/p>\n
-A INPUT -p tcp -m tcp –dport 22 -j ACCEPT \u56e0\u4e3a\u5b83\u8868\u793a\u6240\u6709\u5730\u5740\u90fd\u53ef\u4ee5\u767b\u9646.<\/p>\n
\u6216\u91c7\u7528\u547d\u4ee4\u65b9\u5f0f:<\/p>\n
[root@tp ~]# iptables -D INPUT -p tcp –dport 22 -j ACCEPT<\/p>\n
\u7136\u540e\u4fdd\u5b58,\u6211\u518d\u8bf4\u4e00\u8fb9,\u53cd\u662f\u91c7\u7528\u547d\u4ee4\u7684\u65b9\u5f0f,\u53ea\u5728\u5f53\u65f6\u751f\u6548,\u5982\u679c\u60f3\u8981\u91cd\u8d77\u540e\u4e5f\u8d77\u4f5c\u7528,\u90a3\u5c31\u8981\u4fdd\u5b58.\u5199\u5165\u5230\/etc\/sysconfig\/iptables\u6587\u4ef6\u91cc.<\/p>\n
[root@tp ~]# \/etc\/rc.d\/init.d\/iptables save<\/p>\n
\u8fd9\u6837\u5199 !192.168.0.3 \u8868\u793a\u9664\u4e86192.168.0.3\u7684ip\u5730\u5740<\/p>\n
\u5176\u4ed6\u7684\u89c4\u5219\u8fde\u63a5\u4e5f\u4e00\u6837\u8fd9\u4e48\u8bbe\u7f6e.<\/p>\n
\u5728\u4e0b\u9762\u5c31\u662fFORWARD\u94fe,FORWARD\u94fe\u7684\u9ed8\u8ba4\u89c4\u5219\u662fDROP,\u6240\u4ee5\u6211\u4eec\u5c31\u5199\u9700\u8981ACCETP(\u901a\u8fc7)\u7684\u94fe,\u5bf9\u6b63\u5728\u8f6c\u53d1\u94fe\u7684\u76d1\u63a7.<\/p>\n
\u5f00\u542f\u8f6c\u53d1\u529f\u80fd,(\u5728\u505aNAT\u65f6,FORWARD\u9ed8\u8ba4\u89c4\u5219\u662fDROP\u65f6,\u5fc5\u987b\u505a)<\/p>\n
[root@tp ~]# iptables -A FORWARD -i eth0 -o eth1 -m state –state RELATED,ESTABLISHED -j ACCEPT<\/p>\n
[root@tp ~]# iptables -A FORWARD -i eth1 -o eh0 -j ACCEPT<\/p>\n
\u4e22\u5f03\u574f\u7684TCP\u5305<\/p>\n
[root@tp ~]#iptables -A FORWARD -p TCP ! –syn -m state –state NEW -j DROP<\/p>\n
\u5904\u7406IP\u788e\u7247\u6570\u91cf,\u9632\u6b62\u653b\u51fb,\u5141\u8bb8\u6bcf\u79d2100\u4e2a<\/p>\n
[root@tp ~]#iptables -A FORWARD -f -m limit –limit 100\/s –limit-burst 100 -j ACCEPT<\/p>\n
\u8bbe\u7f6eICMP\u5305\u8fc7\u6ee4,\u5141\u8bb8\u6bcf\u79d21\u4e2a\u5305,\u9650\u5236\u89e6\u53d1\u6761\u4ef6\u662f10\u4e2a\u5305.<\/p>\n
[root@tp ~]#iptables -A FORWARD -p icmp -m limit –limit 1\/s –limit-burst 10 -j ACCEPT<\/p>\n
\u6211\u5728\u524d\u9762\u53ea\u6240\u4ee5\u5141\u8bb8ICMP\u5305\u901a\u8fc7,\u5c31\u662f\u56e0\u4e3a\u6211\u5728\u8fd9\u91cc\u6709\u9650\u5236\u3002<\/p>\n
\u914d\u7f6e\u4e00\u4e2aNAT\u8868\u653e\u706b\u5899<\/p>\n
1\u3001\u67e5\u770b\u672c\u673a\u5173\u4e8eNAT\u7684\u8bbe\u7f6e\u60c5\u51b5<\/p>\n
[root@tp rc.d]# iptables -t nat -L<\/p>\n
Chain PREROUTING (policy ACCEPT)<\/p>\n
target prot opt source destination<\/p>\n
Chain POSTROUTING (policy ACCEPT)<\/p>\n
target prot opt source destination<\/p>\n
SNAT all — 192.168.0.0\/24 anywhere to:211.101.46.235<\/p>\n
Chain OUTPUT (policy ACCEPT)<\/p>\n
target prot opt source destination<\/p>\n
\u6211\u7684NAT\u5df2\u7ecf\u914d\u7f6e\u597d\u4e86\u7684(\u53ea\u662f\u63d0\u4f9b\u6700\u7b80\u5355\u7684\u4ee3\u7406\u4e0a\u7f51\u529f\u80fd,\u8fd8\u6ca1\u6709\u6dfb\u52a0\u9632\u706b\u5899\u89c4\u5219).\u5173\u4e8e\u600e\u4e48\u914d\u7f6eNAT,\u53c2\u8003\u6211\u7684\u53e6\u4e00\u7bc7\u6587\u7ae0<\/p>\n
\u5f53\u7136\u4f60\u5982\u679c\u8fd8\u6ca1\u6709\u914d\u7f6eNAT\u7684\u8bdd,\u4f60\u4e5f\u4e0d\u7528\u6e05\u9664\u89c4\u5219,\u56e0\u4e3aNAT\u5728\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u662f\u4ec0\u4e48\u90fd\u6ca1\u6709\u7684<\/p>\n
\u5982\u679c\u4f60\u60f3\u6e05\u9664,\u547d\u4ee4\u662f<\/p>\n
[root@tp ~]# iptables -F -t nat<\/p>\n
[root@tp ~]# iptables -X -t nat<\/p>\n
[root@tp ~]# iptables -Z -t nat<\/p>\n
2\u3001\u6dfb\u52a0\u89c4\u5219<\/p>\n
\u6dfb\u52a0\u57fa\u672c\u7684NAT\u5730\u5740\u8f6c\u6362,(\u5173\u4e8e\u5982\u4f55\u914d\u7f6eNAT\u53ef\u4ee5\u770b\u6211\u7684\u53e6\u4e00\u7bc7\u6587\u7ae0),<\/p>\n
\u6dfb\u52a0\u89c4\u5219,\u6211\u4eec\u53ea\u6dfb\u52a0DROP\u94fe.\u56e0\u4e3a\u9ed8\u8ba4\u94fe\u5168\u662fACCEPT.<\/p>\n
\u9632\u6b62\u5916\u7f51\u7528\u5185\u7f51IP\u6b3a\u9a97<\/p>\n
[root@tp sysconfig]# iptables -t nat -A PREROUTING -i eth0 -s 10.0.0.0\/8 -j DROP<\/p>\n
[root@tp sysconfig]# iptables -t nat -A PREROUTING -i eth0 -s 172.16.0.0\/12 -j DROP<\/p>\n
[root@tp sysconfig]# iptables -t nat -A PREROUTING -i eth0 -s 192.168.0.0\/16 -j DROP<\/p>\n
\u5982\u679c\u6211\u4eec\u60f3,\u6bd4\u5982\u963b\u6b62MSN,QQ,BT\u7b49\u7684\u8bdd,\u9700\u8981\u627e\u5230\u5b83\u4eec\u6240\u7528\u7684\u7aef\u53e3\u6216\u8005IP,(\u4e2a\u4eba\u8ba4\u4e3a\u6ca1\u6709\u592a\u5927\u5fc5\u8981)<\/p>\n
\u4f8b\uff1a<\/p>\n
\u7981\u6b62\u4e0e211.101.46.253\u7684\u6240\u6709\u8fde\u63a5<\/p>\n
[root@tp ~]# iptables -t nat -A PREROUTING -d 211.101.46.253 -j DROP<\/p>\n
\u7981\u7528FTP(21)\u7aef\u53e3<\/p>\n
[root@tp ~]# iptables -t nat -A PREROUTING -p tcp –dport 21 -j DROP<\/p>\n
\u8fd9\u6837\u5199\u8303\u56f4\u592a\u5927\u4e86,\u6211\u4eec\u53ef\u4ee5\u66f4\u7cbe\u786e\u7684\u5b9a\u4e49.<\/p>\n
[root@tp ~]# iptables -t nat -A PREROUTING -p tcp –dport 21 -d 211.101.46.253 -j DROP<\/p>\n
\u8fd9\u6837\u53ea\u7981\u7528211.101.46.253\u5730\u5740\u7684FTP\u8fde\u63a5,\u5176\u4ed6\u8fde\u63a5\u8fd8\u53ef\u4ee5.\u5982web(80\u7aef\u53e3)\u8fde\u63a5.<\/p>\n
\u6309\u7167\u6211\u5199\u7684,\u4f60\u53ea\u8981\u627e\u5230QQ,MSN\u7b49\u5176\u4ed6\u8f6f\u4ef6\u7684IP\u5730\u5740,\u548c\u7aef\u53e3,\u4ee5\u53ca\u57fa\u4e8e\u4ec0\u4e48\u534f\u8bae,\u53ea\u8981\u7167\u7740\u5199\u5c31\u884c\u4e86.<\/p>\n
\u6700\u540e\uff1a<\/p>\n
drop\u975e\u6cd5\u8fde\u63a5<\/p>\n
[root@tp ~]# iptables -A INPUT -m state –state INVALID -j DROP<\/p>\n
[root@tp ~]# iptables -A OUTPUT -m state –state INVALID -j DROP<\/p>\n
[root@tp ~]# iptables-A FORWARD -m state –state INVALID -j DROP<\/p>\n
\u5141\u8bb8\u6240\u6709\u5df2\u7ecf\u5efa\u7acb\u7684\u548c\u76f8\u5173\u7684\u8fde\u63a5<\/p>\n
[root@tp ~]# iptables-A INPUT -m state –state ESTABLISHED,RELATED -j ACCEPT<\/p>\n
[root@tp ~]# iptables-A OUTPUT -m state –state ESTABLISHED,RELATED -j ACCEPT<\/p>\n
[root@tp ~]# \/etc\/rc.d\/init.d\/iptables save<\/p>\n
\u8fd9\u6837\u5c31\u53ef\u4ee5\u5199\u5230\/etc\/sysconfig\/iptables\u6587\u4ef6\u91cc\u4e86.\u5199\u5165\u540e\u8bb0\u5f97\u628a\u9632\u706b\u5899\u91cd\u8d77\u4e00\u4e0b,\u624d\u80fd\u8d77\u4f5c\u7528\uff0e<\/p>\n
[root@tp ~]# service iptables restart<\/p>\n
\u522b\u5fd8\u4e86\u4fdd\u5b58\uff0c\u4e0d\u884c\u5c31\u5199\u4e00\u90e8\u4fdd\u5b58\u4e00\u6b21\u3002\u4f60\u53ef\u4ee5\u4e00\u8fb9\u4fdd\u5b58\uff0c\u4e00\u8fb9\u505a\u5b9e\u9a8c\uff0c\u770b\u770b\u662f\u5426\u8fbe\u5230\u4f60\u7684\u8981\u6c42\uff0c<\/p>\n
\u4e0a\u9762\u7684\u6240\u6709\u89c4\u5219\u6211\u90fd\u8bd5\u8fc7\uff0c\u6ca1\u6709\u95ee\u9898\u3002<\/p>\n
\u5199\u8fd9\u7bc7\u6587\u7ae0\uff0c\u7528\u4e86\u6211\u5c06\u8fd1\uff11\u4e2a\u6708\u7684\u65f6\u95f4\uff0e\u67e5\u627e\u8d44\u6599\uff0c\u81ea\u5df1\u505a\u5b9e\u9a8c\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u6709\u6240\u5e2e\u52a9\uff0e\u5982\u6709\u4e0d\u5168\u53ca\u4e0d\u5b8c\u5584\u7684\u5730\u65b9\u8fd8\u8bf7\u63d0\u51fa\u3002<\/p>\n
\u56e0\u4e3a\u672c\u7bc7\u6587\u7ae0\u4ee5\u914d\u7f6e\u4e3a\u4e3b.\u5173\u4e8eIPTABLES\u7684\u57fa\u7840\u77e5\u8bc6\u53ca\u6307\u4ee4\u547d\u4ee4\u8bf4\u660e\u7b49\u6211\u4f1a\u5c3d\u5feb\u4f20\u4e0a,\u5f53\u7136\u4f60\u53ef\u4ee5\u53bb\u7f51\u4e0a\u641c\u7d22\u4e00\u4e0b,\u8fd8\u662f\u5f88\u591a\u7684\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5982\u679c\u4f60\u7684IPTABLES\u57fa\u7840\u77e5\u8bc6\u8fd8\u4e0d\u4e86\u89e3,\u5efa\u8bae\u5148\u53bb\u770b\u770b\u3002 <\/p>\n
\u6211\u4eec\u6765\u914d\u7f6e\u4e00\u4e2afilter\u8868\u7684\u9632\u706b\u5899<\/p>\n
1\u3001\u67e5\u770b\u672c\u673a\u5173\u4e8eIPTABLES\u7684\u8bbe\u7f6e\u60c5\u51b5<\/p>\n
[root@tp ~]# iptables -L -n<\/p>\n
Chain INPUT (policy ACCEPT)<\/p>\n
target prot opt source destination<\/p>\n
Chain FORWARD (policy ACCEPT)<\/p>\n
target prot opt source destination<\/p>\n
Chain OUTPUT (policy ACCEPT)<\/p>\n
target prot opt source destination<\/p>\n
Chain RH-Firewall-1-INPUT (0 references)<\/p>\n
target prot opt source destination<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[8],"tags":[],"_links":{"self":[{"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/posts\/1007"}],"collection":[{"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/comments?post=1007"}],"version-history":[{"count":0,"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/posts\/1007\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/media?parent=1007"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/categories?post=1007"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/tags?post=1007"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}