\u8f6c\u8f7d\u81ea\uff1ahttp:\/\/hi.baidu.com\/zplllm\/item\/f910cb26b621db57c38d5983<\/p>\n
1\u3001\u5173\u95ed\u6240\u6709\u7684 INPUT FORWARD OUTPUT \u53ea\u5bf9\u67d0\u4e9b\u7aef\u53e3\u5f00\u653e\u3002
\n\u4e0b\u9762\u662f\u547d\u4ee4\u5b9e\u73b0\uff1a<\/p>\n
iptables -P INPUT DROP
\niptables -P FORWARD DROP
\niptables -P OUTPUT DROP<\/p>\n
\u518d\u7528\u547d\u4ee4 iptables -L -n \u67e5\u770b \u662f\u5426\u8bbe\u7f6e\u597d\uff0c \u597d\u770b\u5230\u5168\u90e8 DROP \u4e86
\n\u8fd9\u6837\u7684\u8bbe\u7f6e\u597d\u4e86\uff0c\u6211\u4eec\u53ea\u662f\u4e34\u65f6\u7684\uff0c \u91cd\u542f\u670d\u52a1\u5668\u8fd8\u662f\u4f1a\u6062\u590d\u539f\u6765\u6ca1\u6709\u8bbe\u7f6e\u7684\u72b6\u6001
\n\u8fd8\u8981\u4f7f\u7528 service iptables save \u8fdb\u884c\u4fdd\u5b58
\n\u770b\u5230\u4fe1\u606f firewall rules \u9632\u706b\u5899\u7684\u89c4\u5219 \u5176\u5b9e\u5c31\u662f\u4fdd\u5b58\u5728 \/etc\/sysconfig\/iptables
\n\u53ef\u4ee5\u6253\u5f00\u6587\u4ef6\u67e5\u770b vi \/etc\/sysconfig\/iptables
\n2\u3001
\n\u4e0b\u9762\u6211\u53ea\u6253\u5f0022\u7aef\u53e3\uff0c\u770b\u6211\u662f\u5982\u4f55\u64cd\u4f5c\u7684\uff0c\u5c31\u662f\u4e0b\u97622\u4e2a\u8bed\u53e5<\/p>\n
iptables -A INPUT -p tcp --dport 22 -j ACCEPT
\niptables -A OUTPUT -p tcp --sport 22 -j ACCEPT<\/p>\n
\u518d\u67e5\u770b\u4e0b iptables -L -n \u662f\u5426\u6dfb\u52a0\u4e0a\u53bb, \u770b\u5230\u6dfb\u52a0\u4e86<\/p>\n
Chain INPUT (policy DROP)
\ntarget prot opt source destination
\nACCEPT tcp -- 0.0.0.0\/0 0.0.0.0\/0 tcp dpt:22<\/p>\n
Chain FORWARD (policy DROP)
\ntarget prot opt source destination<\/p>\n
Chain OUTPUT (policy DROP)
\ntarget prot opt source destination
\nACCEPT tcp -- 0.0.0.0\/0 0.0.0.0\/0 tcp spt:22<\/p>\n
\u73b0\u5728Linux\u670d\u52a1\u5668\u53ea\u6253\u5f00\u4e8622\u7aef\u53e3\uff0c\u7528putty.exe\u6d4b\u8bd5\u4e00\u4e0b\u662f\u5426\u53ef\u4ee5\u94fe\u63a5\u4e0a\u53bb\u3002
\n\u53ef\u4ee5\u94fe\u63a5\u4e0a\u53bb\u4e86\uff0c\u8bf4\u660e\u6ca1\u6709\u95ee\u9898\u3002<\/p>\n
\u6700\u540e\u522b\u5fd8\u8bb0\u4e86\u4fdd\u5b58 \u5bf9\u9632\u706b\u5899\u7684\u8bbe\u7f6e
\n\u901a\u8fc7\u547d\u4ee4\uff1aservice iptables save \u8fdb\u884c\u4fdd\u5b58
\n\u91cd\u542fiptables
\nservice iptables save && service iptables restart
\n\u5173\u95ed\u9632\u706b\u5899
\nchkconfig iptables off && service iptables stop<\/p>\n
iptables -A INPUT -p tcp --dport 22 -j ACCEPT
\niptables -A OUTPUT -p tcp --sport 22 -j ACCEPT
\n\u9488\u5bf9\u8fd92\u6761\u547d\u4ee4\u8fdb\u884c\u4e00\u4e9b\u8bb2\u89e3\u5427
\n-A \u53c2\u6570\u5c31\u770b\u6210\u662f\u6dfb\u52a0\u4e00\u6761 INPUT \u7684\u89c4\u5219
\n-p \u6307\u5b9a\u662f\u4ec0\u4e48\u534f\u8bae \u6211\u4eec\u5e38\u7528\u7684tcp \u534f\u8bae\uff0c\u5f53\u7136\u4e5f\u6709udp \u4f8b\u598253\u7aef\u53e3\u7684DNS
\n\u5230\u65f6\u6211\u4eec\u8981\u914d\u7f6eDNS\u7528\u523053\u7aef\u53e3 \u5927\u5bb6\u5c31\u4f1a\u53d1\u73b0\u4f7f\u7528udp\u534f\u8bae\u7684<\/p>\n
\u800c --dport \u5c31\u662f\u76ee\u6807\u7aef\u53e3 \u5f53\u6570\u636e\u4ece\u5916\u90e8\u8fdb\u5165\u670d\u52a1\u5668\u4e3a\u76ee\u6807\u7aef\u53e3
\n\u53cd\u4e4b \u6570\u636e\u4ece\u670d\u52a1\u5668\u51fa\u53bb \u5219\u4e3a\u6570\u636e\u6e90\u7aef\u53e3 \u4f7f\u7528 --sport<\/p>\n
-j \u5c31\u662f\u6307\u5b9a\u662f ACCEPT \u63a5\u6536 \u6216\u8005 DROP \u4e0d\u63a5\u6536
\n3\u3001\u7981\u6b62\u67d0\u4e2aIP\u8bbf\u95ee
\n1\u53f0Linux\u670d\u52a1\u5668,2\u53f0windows xp \u64cd\u4f5c\u7cfb\u7edf\u8fdb\u884c\u8bbf\u95ee
\nLinux\u670d\u52a1\u5668ip 192.168.1.99
\nxp1 ip: 192.168.1.2
\nxp2 ip: 192.168.1.8<\/p>\n
\u4e0b\u9762\u770b\u770b\u62112\u53f0xp \u90fd\u53ef\u4ee5\u8bbf\u95ee\u7684<\/p>\n
192.168.1.2 \u8fd9\u662f xp1 \u53ef\u4ee5\u8bbf\u95ee\u7684\uff0c
\n192.168.1.8 xp2 \u4e5f\u662f\u53ef\u4ee5\u6b63\u5e38\u8bbf\u95ee\u7684\u3002<\/p>\n
\u90a3\u4e48\u73b0\u5728\u6211\u8981\u7981\u6b62 192.168.1.2 xp1 \u8bbf\u95ee\uff0c xp2 \u6b63\u5e38\u8bbf\u95ee\uff0c
\n\u4e0b\u9762\u770b\u770b\u6f14\u793a<\/p>\n
\u901a\u8fc7\u547d\u4ee4 iptables -A INPUT -p tcp -s 192.168.1.2 -j DROP
\n\u8fd9\u91cc\u610f\u601d\u5c31\u662f -A \u5c31\u662f\u6dfb\u52a0\u65b0\u7684\u89c4\u5219\uff0c \u600e\u6837\u7684\u89c4\u5219\u5462\uff1f \u7531\u4e8e\u6211\u4eec\u8bbf\u95ee\u7f51\u7ad9\u4f7f\u7528tcp\u7684\uff0c
\n\u6211\u4eec\u5c31\u7528 -p tcp , \u5982\u679c\u662f udp \u5c31\u5199udp\uff0c\u8fd9\u91cc\u5c31\u7528tcp\u4e86\uff0c -s\u5c31\u662f \u6765\u6e90\u7684\u610f\u601d\uff0c
\nip\u6765\u6e90\u4e8e 192.168.1.2 \uff0c-j \u600e\u4e48\u505a \u6211\u4eec\u62d2\u7edd\u5b83 \u8fd9\u91cc\u5e94\u8be5\u662f DROP<\/p>\n
\u597d\uff0c\u770b\u770b\u6548\u679c\u3002\u597d\u6dfb\u52a0\u6210\u529f\u3002\u4e0b\u9762\u8fdb\u884c\u9a8c\u8bc1 \u4e00\u4e0b\u662f\u5426\u751f\u6548<\/p>\n
\u4e00\u76f4\u51fa\u73b0\u7b49\u5f85\u72b6\u6001 \u6700\u540e \u8be5\u9875\u65e0\u6cd5\u663e\u793a \uff0c\u8fd9\u662f 192.168.1.2 xp1 \u7684\u8bbf\u95ee\u88ab\u62d2\u7edd\u4e86\u3002<\/p>\n
\u518d\u770b\u770b\u53e6\u5916\u4e00\u53f0 xp \u662f\u5426\u53ef\u4ee5\u8bbf\u95ee\uff0c \u662f\u53ef\u4ee5\u6b63\u5e38\u8bbf\u95ee\u7684 192.168.1.8 \u662f\u53ef\u4ee5\u6b63\u5e38\u8bbf\u95ee\u7684
\n4\u3001\u5982\u4f55\u5220\u9664\u89c4\u5219
\n\u9996\u5148\u6211\u4eec\u8981\u77e5\u9053 \u8fd9\u6761\u89c4\u5219\u7684\u7f16\u53f7\uff0c\u6bcf\u6761\u89c4\u5219\u90fd\u6709\u4e00\u4e2a\u7f16\u53f7<\/p>\n
\u901a\u8fc7 iptables -L -n --line-number \u53ef\u4ee5\u663e\u793a\u89c4\u5219\u548c\u76f8\u5bf9\u5e94\u7684\u7f16\u53f7
\nnum target prot opt source destination
\n1 DROP tcp -- 0.0.0.0\/0 0.0.0.0\/0 tcp dpt:3306
\n2 DROP tcp -- 0.0.0.0\/0 0.0.0.0\/0 tcp dpt:21
\n3 DROP tcp -- 0.0.0.0\/0 0.0.0.0\/0 tcp dpt:80
\n\u591a\u4e86 num \u8fd9\u4e00\u5217\uff0c \u8fd9\u6837\u6211\u4eec\u5c31\u53ef\u4ee5 \u770b\u5230\u521a\u624d\u7684\u89c4\u5219\u5bf9\u5e94\u7684\u662f \u7f16\u53f72<\/p>\n
\u90a3\u4e48\u6211\u4eec\u5c31\u53ef\u4ee5\u8fdb\u884c\u5220\u9664\u4e86
\niptables -D INPUT 2
\n\u5220\u9664INPUT\u94fe\u7f16\u53f7\u4e3a2\u7684\u89c4\u5219\u3002<\/p>\n
\u518d iptables -L -n \u67e5\u770b\u4e00\u4e0b \u5df2\u7ecf\u88ab\u6e05\u9664\u4e86\u3002
\n5\u3001\u8fc7\u6ee4\u65e0\u6548\u7684\u6570\u636e\u5305
\n\u5047\u8bbe\u6709\u4eba\u8fdb\u5165\u4e86\u670d\u52a1\u5668\uff0c\u6216\u8005\u6709\u75c5\u6bd2\u6728\u9a6c\u7a0b\u5e8f\uff0c\u5b83\u53ef\u4ee5\u901a\u8fc722\uff0c80\u7aef\u53e3\u50cf\u670d\u52a1\u5668\u5916\u4f20\u9001\u6570\u636e\u3002
\n\u5b83\u7684\u8fd9\u79cd\u65b9\u5f0f\u5c31\u548c\u6211\u4eec\u6b63\u5e38\u8bbf\u95ee22\uff0c80\u7aef\u53e3\u533a\u522b\u3002\u5b83\u53d1\u5411\u5916\u53d1\u7684\u6570\u636e\u4e0d\u662f\u6211\u4eec\u901a\u8fc7\u8bbf\u95ee\u7f51\u9875\u8bf7\u6c42
\n\u800c\u56de\u5e94\u7684\u6570\u636e\u5305\u3002<\/p>\n
\u4e0b\u9762\u6211\u4eec\u8981\u7981\u6b62\u8fd9\u4e9b\u6ca1\u6709\u901a\u8fc7\u8bf7\u6c42\u56de\u5e94\u7684\u6570\u636e\u5305\uff0c\u7edf\u7edf\u628a\u5b83\u4eec\u5835\u4f4f\u6389\u3002<\/p>\n
iptables \u63d0\u4f9b\u4e86\u4e00\u4e2a\u53c2\u6570 \u662f\u68c0\u67e5\u72b6\u6001\u7684\uff0c\u4e0b\u9762\u6211\u4eec\u6765\u914d\u7f6e\u4e0b 22 \u548c 80 \u7aef\u53e3\uff0c\u9632\u6b62\u65e0\u6548\u7684\u6570\u636e\u5305\u3002<\/p>\n
iptables -A OUTPUT -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT<\/p>\n
\u53ef\u4ee5\u770b\u5230\u548c\u6211\u4eec\u4ee5\u524d\u4f7f\u7528\u7684\uff1a
\niptables -A OUTPUT -p tcp --sport 22 -j ACCEPT
\n\u591a\u4e86\u4e00\u4e2a\u72b6\u6001\u5224\u65ad\u3002<\/p>\n
\u540c\u683780\u7aef\u53e3\u4e5f\u4e00\u6837\uff0c \u73b0\u5728\u5220\u6389\u539f\u6765\u76842\u6761\u89c4\u5219\uff0c
\niptables -L -n --line-number \u8fd9\u4e2a\u662f\u67e5\u770b\u89c4\u5219\u800c\u4e14\u5e26\u4e0a\u7f16\u53f7\u3002\u6211\u4eec\u770b\u5230\u7f16\u53f7\u5c31\u53ef\u4ee5
\n\u5220\u9664\u5bf9\u5e94\u7684\u89c4\u5219\u4e86\u3002<\/p>\n
iptables -D OUTPUT 1 \u8fd9\u91cc\u76841\u8868\u793a\u7b2c\u4e00\u6761\u89c4\u5219\u3002<\/p>\n
\u5f53\u4f60\u5220\u9664\u4e86\u524d\u9762\u7684\u89c4\u5219\uff0c \u7f16\u53f7\u4e5f\u4f1a\u968f\u4e4b\u6539\u53d8\u3002\u770b\u5230\u4e86\u5427\u3002<\/p>\n
\u597d\uff0c\u6211\u4eec\u5220\u9664\u4e86\u524d\u97622\u4e2a\u89c4\u5219\uff0c22\u7aef\u53e3\u8fd8\u53ef\u4ee5\u6b63\u5e38\u4f7f\u7528\uff0c\u8bf4\u660e\u6ca1\u95ee\u9898\u4e86<\/p>\n
\u4e0b\u9762\u8fdb\u884c\u4fdd\u5b58\uff0c\u522b\u5fd8\u8bb0\u4e86\uff0c\u4e0d\u7136\u7684\u8bdd\u91cd\u542f\u5c31\u4f1a\u8fd8\u539f\u5230\u539f\u6765\u7684\u6837\u5b50\u3002<\/p>\n
service iptables save \u8fdb\u884c\u4fdd\u5b58\u3002<\/p>\n
Saving firewall rules to \/etc\/sysconfig\/iptables: [ OK ]
\n\u5176\u5b9e\u5c31\u662f\u628a\u521a\u624d\u8bbe\u7f6e\u7684\u89c4\u5219\u5199\u5165\u5230 \/etc\/sysconfig\/iptables \u6587\u4ef6\u4e2d\u3002
\n6\u3001DNS\u7aef\u53e353\u8bbe\u7f6e
\n\u4e0b\u9762\u6211\u4eec\u6765\u770b\u770b\u5982\u4f55\u8bbe\u7f6eiptables\u6765\u6253\u5f00DNS\u7aef\u53e3\uff0cDNS\u7aef\u53e3\u5bf9\u5e94\u7684\u662f53<\/p>\n
\u5927\u5bb6\u770b\u5230\u6211\u73b0\u5728\u7684\u60c5\u51b5\u4e86\u5427\uff0c\u53ea\u5f00\u653e22\u548c80\u7aef\u53e3\uff0c \u6211\u73b0\u5728\u770b\u770b\u80fd\u4e0d\u80fd\u89e3\u6790\u57df\u540d\u3002<\/p>\n
host www.google.com \u8f93\u5165\u8fd9\u4e2a\u547d\u4ee4\u540e\uff0c\u4e00\u76f4\u7b49\u5f85\uff0c\u8bf4\u660eDNS\u4e0d\u901a<\/p>\n
\u51fa\u73b0\u4e0b\u9762\u63d0\u793a \uff1a
\n;; connection timed out; no servers could be reached<\/p>\n
ping \u4e00\u4e0b\u57df\u540d\u4e5f\u662f\u4e0d\u901a
\n[root@localhost ~ping www.google.com
\nping: unknown host www.google.com<\/p>\n
\u6211\u8fd9\u91cc\u7684\u539f\u56e0\u5c31\u662f iptables \u9650\u5236\u4e8653\u7aef\u53e3\u3002<\/p>\n
\u6709\u4e9b\u670d\u52a1\u5668\uff0c\u7279\u522b\u662fWeb\u670d\u52a1\u5668\u51cf\u6162\uff0cDNS\u5176\u5b9e\u4e5f\u6709\u5173\u7cfb\u7684\uff0c\u65e0\u6cd5\u53d1\u9001\u5305\u5230DNS\u670d\u52a1\u5668\u5bfc\u81f4\u7684\u3002<\/p>\n
\u4e0b\u9762\u6f14\u793a\u4e0b\u5982\u4f55\u4f7f\u7528 iptables \u6765\u8bbe\u7f6eDNS 53\u8fd9\u4e2a\u7aef\u53e3\uff0c\u5982\u679c\u4f60\u4e0d\u77e5\u9053 \u57df\u540d\u670d\u52a1\u7aef\u53e3\u53f7\uff0c\u4f60<\/p>\n
\u53ef\u4ee5\u7528\u547d\u4ee4 : grep domain \/etc\/services<\/p>\n
[root@localhost ~grep domain \/etc\/services
\ndomain 53\/tcp # name-domain server
\ndomain 53\/udp
\ndomaintime 9909\/tcp # domaintime
\ndomaintime 9909\/udp # domaintime<\/p>\n
\u770b\u5230\u4e86\u5427\uff0c \u6211\u4eec\u4e00\u822c\u4f7f\u7528 udp \u534f\u8bae\u3002<\/p>\n
\u597d\u4e86\uff0c \u5f00\u59cb\u8bbe\u7f6e\u3002\u3002\u3002<\/p>\n
iptables -A OUTPUT -p udp --dport 53 -j ACCEPT
\n\u8fd9\u662f\u6211\u4eec ping \u4e00\u4e2a\u57df\u540d\uff0c\u6570\u636e\u5c31\u662f\u4ece\u672c\u673a\u51fa\u53bb\uff0c\u6240\u4ee5\u6211\u4eec\u5148\u8bbe\u7f6e OUTPUT\uff0c
\n\u6211\u4eec\u6309\u7167ping\u8fd9\u4e2a\u6d41\u7a0b\u6765\u8bbe\u7f6e\u3002<\/p>\n
\u7136\u540e DNS \u670d\u52a1\u5668\u6536\u5230\u6211\u4eec\u53d1\u51fa\u53bb\u7684\u5305\uff0c\u5c31\u56de\u5e94\u4e00\u4e2a\u56de\u6765
\niptables -A INPUT -p udp --sport 53 -j ACCEPT<\/p>\n
\u540c\u65f6\u8fd8\u8981\u8bbe\u7f6e
\niptables -A INPUT -p udp --dport 53 -j ACCEPT
\niptables -A OUTPUT -p udp --sport 53 -j ACCEPT<\/p>\n
\u597d\u4e86\uff0c \u4e0b\u9762\u5f00\u59cb\u6d4b\u8bd5\u4e0b\uff0c \u53ef\u4ee5\u7528 iptables -L -n \u67e5\u770b\u8bbe\u7f6e\u60c5\u51b5\uff0c\u786e\u5b9a\u6ca1\u6709\u95ee\u9898\u5c31\u53ef\u4ee5\u6d4b\u8bd5\u4e86<\/p>\n
[root@localhost ~iptables -L -n
\nChain INPUT (policy DROP)
\ntarget prot opt source destination
\nACCEPT tcp -- 0.0.0.0\/0 0.0.0.0\/0 tcp dpt:22
\nACCEPT tcp -- 0.0.0.0\/0 0.0.0.0\/0 tcp dpt:80
\nACCEPT udp -- 0.0.0.0\/0 0.0.0.0\/0 udp spt:53
\nACCEPT udp -- 0.0.0.0\/0 0.0.0.0\/0 udp dpt:53<\/p>\n
Chain FORWARD (policy DROP)
\ntarget prot opt source destination<\/p>\n
Chain OUTPUT (policy DROP)
\ntarget prot opt source destination
\nACCEPT tcp -- 0.0.0.0\/0 0.0.0.0\/0 tcp spt:22 state ESTABLISHED
\nACCEPT tcp -- 0.0.0.0\/0 0.0.0.0\/0 tcp spt:80 state ESTABLISHED
\nACCEPT udp -- 0.0.0.0\/0 0.0.0.0\/0 udp dpt:53
\nACCEPT udp -- 0.0.0.0\/0 0.0.0.0\/0 udp spt:53<\/p>\n
\u53ef\u4ee5\u6d4b\u8bd5\u4e00\u4e0b \u662f\u5426 DNS \u53ef\u4ee5\u901a\u8fc7iptables \u4e86\u3002<\/p>\n
[root@localhost ~host www.google.com
\nwww.google.com is an alias for www.l.google.com.
\nwww.l.google.com is an alias for www-china.l.google.com.
\nwww-china.l.google.com has address 64.233.189.104
\nwww-china.l.google.com has address 64.233.189.147
\nwww-china.l.google.com has address 64.233.189.99<\/p>\n
\u6b63\u5e38\u53ef\u4ee5\u89e3\u6790 google \u57df\u540d\u3002<\/p>\n
ping \u65b9\u9762\u53ef\u80fd\u8fd8\u8981\u8bbe\u7f6e\u4e9b\u4e1c\u897f\u3002<\/p>\n
\u7528 nslookup \u770b\u770b\u5427<\/p>\n
[root@localhost ~nslookup
\n> www.google.com
\nServer: 192.168.1.1
\nAddress: 192.168.1.1#53<\/p>\n
Non-authoritative answer:
\nwww.google.com canonical name = www.l.google.com.
\nwww.l.google.com canonical name = www-china.l.google.com.
\nName: www-china.l.google.com
\nAddress: 64.233.189.147
\nName: www-china.l.google.com
\nAddress: 64.233.189.99
\nName: www-china.l.google.com
\nAddress: 64.233.189.104<\/p>\n
\u8bf4\u660e\u672c\u673aDNS\u6b63\u5e38\uff0c iptables \u5141\u8bb853\u8fd9\u4e2a\u7aef\u53e3\u7684\u8bbf\u95ee\u3002
\n7\u3001iptables\u5bf9ftp\u7684\u8bbe\u7f6e
\n\u73b0\u5728\u6211\u5f00\u59cb\u5bf9ftp\u7aef\u53e3\u7684\u8bbe\u7f6e\uff0c\u6309\u7167\u6211\u4eec\u4ee5\u524d\u7684\u89c6\u9891\uff0c\u6dfb\u52a0\u9700\u8981\u5f00\u653e\u7684\u7aef\u53e3
\nftp\u8fde\u63a5\u7aef\u53e3\u67092\u4e2a 21 \u548c 20 \u7aef\u53e3\uff0c\u6211\u73b0\u5728\u6dfb\u52a0\u5bf9\u5e94\u7684\u89c4\u5219\u3002<\/p>\n
[root@localhost rootiptables -A INPUT -p tcp --dport 21 -j ACCEPT
\n[root@localhost rootiptables -A INPUT -p tcp --dport 20 -j ACCEPT
\n[root@localhost rootiptables -A OUTPUT -p tcp --sport 21 -j ACCEPT
\n[root@localhost rootiptables -A OUTPUT -p tcp --sport 20 -j ACCEPT<\/p>\n
\u597d\uff0c\u8fd9\u6837\u5c31\u6dfb\u52a0\u5b8c\u4e86\uff0c\u6211\u4eec\u7528\u6d4f\u89c8\u5668\u8bbf\u95ee\u4e00\u4e0bftp,\u51fa\u73b0\u8d85\u65f6\u3002<\/p>\n
\u6240\u4ee5\u6211\u521a\u624d\u8bf4 ftp \u662f\u6bd4\u8f83\u7279\u6b8a\u7684\u7aef\u53e3\uff0c\u5b83\u8fd8\u6709\u4e00\u4e9b\u7aef\u53e3\u662f \u6570\u636e\u4f20\u8f93\u7aef\u53e3\uff0c
\n\u4f8b\u5982\u76ee\u5f55\u5217\u8868\uff0c \u4e0a\u4f20 \uff0c\u4e0b\u8f7d \u6587\u4ef6\u90fd\u8981\u7528\u5230\u8fd9\u4e9b\u7aef\u53e3\u3002<\/p>\n
\u800c\u8fd9\u4e9b\u7aef\u53e3\u662f \u4efb\u610f \u7aef\u53e3\u3002\u3002\u3002 \u8fd9\u4e2a \u4efb\u610f \u771f\u7684\u6bd4\u8f83\u7279\u6b8a\u3002<\/p>\n
\u5982\u679c\u4e0d\u6307\u5b9a\u4ec0\u4e48\u4e00\u4e2a\u7aef\u53e3\u8303\u56f4\uff0c iptables \u5f88\u96be\u5bf9\u4efb\u610f\u7aef\u53e3\u5f00\u653e\u7684\uff0c
\n\u5982\u679ciptables\u5141\u8bb8\u4efb\u610f\u7aef\u53e3\u8bbf\u95ee\uff0c \u90a3\u548c\u4e0d\u8bbe\u7f6e\u9632\u706b\u5899\u6ca1\u4ec0\u4e48\u533a\u522b\uff0c\u6240\u4ee5\u4e0d\u73b0\u5b9e\u7684\u3002<\/p>\n
\u90a3\u4e48\u6211\u4eec\u7684\u89e3\u51b3\u529e\u6cd5\u5c31\u662f \u6307\u5b9a\u8fd9\u4e2a\u6570\u636e\u4f20\u8f93\u7aef\u53e3\u7684\u4e00\u4e2a\u8303\u56f4\u3002<\/p>\n
\u4e0b\u9762\u6211\u4eec\u4fee\u6539\u4e00\u4e0bftp\u914d\u7f6e\u6587\u4ef6\u3002<\/p>\n
\u6211\u8fd9\u91cc\u4f7f\u7528vsftpd\u6765\u4fee\u6539\u6f14\u793a\uff0c\u5176\u4ed6ftp\u6211\u4e0d\u77e5\u9053\u54ea\u91cc\u4fee\u6539\uff0c\u5927\u5bb6\u53ef\u4ee5\u627e\u627e\u8d44\u6599\u3002<\/p>\n
[root@localhost rootvi \/etc\/vsftpd.conf<\/p>\n
\u5728\u914d\u7f6e\u6587\u4ef6\u7684\u6700\u4e0b\u9762 \u52a0\u5165<\/p>\n
pasv_min_port=30001
\npasv_max_port=31000<\/p>\n
\u7136\u540e\u4fdd\u5b58\u9000\u51fa\u3002<\/p>\n
\u8fd9\u4e24\u53e5\u8bdd\u7684\u610f\u601d\u544a\u8bc9vsftpd, \u8981\u4f20\u8f93\u6570\u636e\u7684\u7aef\u53e3\u8303\u56f4\u5c31\u572830001\u523031000 \u8fd9\u4e2a\u8303\u56f4\u5185\u4f20\u9001\u3002<\/p>\n
\u8fd9\u6837\u6211\u4eec\u4f7f\u7528 iptables \u5c31\u597d\u529e\u591a\u4e86\uff0c\u6211\u4eec\u5c31\u6253\u5f00 30001\u523031000 \u8fd9\u4e9b\u7aef\u53e3\u3002<\/p>\n
[root@localhost rootiptables -A INPUT -p tcp --dport 30001:31000 -j ACCEPT
\n[root@localhost rootiptables -A OUTPUT -p tcp --sport 30001:31000 -j ACCEPT<\/p>\n
[root@localhost rootservice iptables save<\/p>\n
\u6700\u540e\u8fdb\u884c\u4fdd\u5b58\uff0c \u7136\u540e\u6211\u4eec\u518d\u7528\u6d4f\u89c8\u5668\u8303\u56f4\u4e0b ftp\u3002\u53ef\u4ee5\u6b63\u5e38\u8bbf\u95ee<\/p>\n
\u7528\u4e2a\u8d26\u53f7\u767b\u9646\u4e0a\u53bb\uff0c\u4e5f\u6ca1\u6709\u95ee\u9898\uff0c\u4e0a\u4f20\u4e00\u4e9b\u6587\u4ef6\u4e0a\u53bb\u770b\u770b\u3002<\/p>\n
\u770b\u5230\u4e86\u5427\uff0c\u4e0a\u4f20\u548c\u4e0b\u8f7d\u90fd\u6b63\u5e38\u3002\u3002 \u518d\u67e5\u770b\u4e0b iptables \u7684\u8bbe\u7f6e<\/p>\n
[root@localhost rootiptables -L -n
\nChain INPUT (policy DROP)
\ntarget prot opt source destination
\nACCEPT tcp -- 0.0.0.0\/0 0.0.0.0\/0 tcp dpt:22
\nACCEPT tcp -- 0.0.0.0\/0 0.0.0.0\/0 tcp dpt:21
\nACCEPT tcp -- 0.0.0.0\/0 0.0.0.0\/0 tcp dpt:20
\nACCEPT tcp -- 0.0.0.0\/0 0.0.0.0\/0 tcp dpts:30001:31000<\/p>\n
Chain FORWARD (policy DROP)
\ntarget prot opt source destination<\/p>\n
Chain OUTPUT (policy DROP)
\ntarget prot opt source destination
\nACCEPT tcp -- 0.0.0.0\/0 0.0.0.0\/0 tcp spt:22
\nACCEPT tcp -- 0.0.0.0\/0 0.0.0.0\/0 tcp spt:21
\nACCEPT tcp -- 0.0.0.0\/0 0.0.0.0\/0 tcp spt:20
\nACCEPT tcp -- 0.0.0.0\/0 0.0.0.0\/0 tcp spts:30001:31000<\/p>\n
\u8fd9\u662f\u6211\u4e3a\u4e86\u6f14\u793aftp\u7279\u6b8a\u7aef\u53e3\u505a\u7684\u7b80\u5355\u89c4\u5219\uff0c\u5927\u5bb6\u53ef\u4ee5\u6dfb\u52a0\u4e00\u4e9b\u5bf9\u6570\u636e\u5305\u7684\u9a8c\u8bc1
\n\u4f8b\u5982 -m state --state ESTABLISHED,RELATED \u7b49\u7b49\u8981\u6c42\u66f4\u52a0\u9ad8\u7684\u9a8c\u8bc1<\/p>\n","protected":false},"excerpt":{"rendered":"
\u8f6c\u8f7d\u81ea\uff1ahttp:\/\/hi.baidu.com\/zplllm\/item\/f910cb26b621db57c38d5983 1\u3001\u5173\u95ed …<\/p>\n","protected":false},"author":1,"featured_media":361,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"emotion":"","emotion_color":"","title_style":"","license":"","footnotes":""},"categories":[4],"tags":[21],"class_list":["post-360","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-internet","tag-linux"],"_links":{"self":[{"href":"https:\/\/lox.im\/index.php\/wp-json\/wp\/v2\/posts\/360","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lox.im\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lox.im\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lox.im\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lox.im\/index.php\/wp-json\/wp\/v2\/comments?post=360"}],"version-history":[{"count":0,"href":"https:\/\/lox.im\/index.php\/wp-json\/wp\/v2\/posts\/360\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lox.im\/index.php\/wp-json\/wp\/v2\/media\/361"}],"wp:attachment":[{"href":"https:\/\/lox.im\/index.php\/wp-json\/wp\/v2\/media?parent=360"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lox.im\/index.php\/wp-json\/wp\/v2\/categories?post=360"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lox.im\/index.php\/wp-json\/wp\/v2\/tags?post=360"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}