{"id":2964,"date":"2012-04-19T15:33:59","date_gmt":"2012-04-19T07:33:59","guid":{"rendered":"http:\/\/jpuyy.com\/?p=2964"},"modified":"2013-08-26T16:26:27","modified_gmt":"2013-08-26T08:26:27","slug":"centos6-iptables-basic","status":"publish","type":"post","link":"https:\/\/jpuyy.com\/?p=2964","title":{"rendered":"CentOS6.2\u7684iptables\u57fa\u7840"},"content":{"rendered":"<p>\u6765\u81ea\u4e8e<\/p>\n<p>Linux iptables Pocket Reference<\/p>\n<p>CentOS\u7684iptables\u89c4\u5219\u4fdd\u5b58\u5728<code>\/etc\/sysconfig\/iptables<\/code><\/p>\n<p>\u67e5\u770biptables\u7684\u542f\u52a8\u7ea7\u522b<\/p>\n<pre>[root@localhost ~]# chkconfig --list iptables\r\niptables        0:off   1:off   2:on    3:on    4:on    5:on    6:off<\/pre>\n<p>\u8c03\u6574\u542f\u52a8\u7ea7\u522b\u53ef\u4ee5\u7528\u5982\u4e0b\u547d\u4ee4<\/p>\n<pre>chkconfig --levels 345 iptables on<\/pre>\n<p>\u542f\u52a8iptables<\/p>\n<pre>service iptables start<\/pre>\n<p>\u505c\u7528iptables<\/p>\n<pre>service iptables stop<\/pre>\n<p>\u4e00\u4e9b\u4f2a\u6587\u4ef6\uff1a(\u5b58\u5728\u4e8e\/proc)<\/p>\n<p>\/etc\/sysctl.conf\u5728\u542f\u52a8\u91cc\u521b\u5efa\u4e86\/proc\/sys\uff0c\u5982\u914d\u7f6epptp-vpn\u7684\u65f6\u5019\uff0c\u5728sysctl.conf\u91cc\u52a0\u5165net.ipv4.ip_forward=1\u5f00\u673a\u540e\uff0c\u67e5\u770b\/proc\/sys\/net\/ipv4\/ip_forward\uff0c\u5c31\u4f1a\u53d1\u73b0\u53d8\u4e3a1.<\/p>\n<p>\/proc\/sys\/net\/ipv4\/ip_conntrack_max\uff0c\u5f53\u51fa\u73b0\u201cip_conntrack: table\u00a0full, dropping packet\u201d\u9519\u8bef\u65f6\uff0c\u4f60\u9700\u8981\u5728\/etc\/sysctl.conf\u52a0\u503c\u3002<\/p>\n<p>\u7528uname -r\u53ef\u67e5\u770b\u5185\u6838\u7248\u672c\u4fe1\u606f<\/p>\n<p>uname -a\u67e5\u770b\u5168\u90e8\u4fe1\u606f\uff0c\u5177\u4f53\u89c1(manpage of uname).<\/p>\n<p>\u51e0\u4e2a\u72b6\u6001\u7684\u8bf4\u660e<\/p>\n<p>ESTABLISHED \u5df2\u7ecf\u76d1\u6d4b\u5230\u53cc\u5411\u53d1\u9001\u7684\u5305<\/p>\n<p>INVALID \u4ec0\u4e48\u90fd\u6ca1\u6709<\/p>\n<p>NEW \u6709\u65b0\u7684\u8fde\u63a5\u6216\u76d1\u6d4b\u5230\u4e00\u90e8\u5206<\/p>\n<p>RELATED \u6709\u65b0\u7684\u8fde\u63a5\uff0c\u4e14\u65b0\u8fde\u63a5\u662f\u57fa\u4e8e\u5df2\u6709\u8fde\u63a5<\/p>\n<p>\u8fde\u63a5\u76d1\u6d4b\u4e3b\u8981\u662f\u8fde\u63a5\u7684\u524d\u4e09\u4e2a\u6bd4\u7279\u3002<\/p>\n<p>conntrack \u53c2\u6570\uff0c(&#8211;ststatus\u9009\u9879)\u6709<\/p>\n<p>ASSURED TCP\u8fde\u63a5\uff0c\u8bf4\u660eTCP\u5df2\u7ecf\u8fde\u63a5\uff0cUDP\u96f7\u540c<\/p>\n<p>EXPECTED \u8bf4\u660e\u8fde\u63a5\u662f\u5df2\u77e5\u7684<\/p>\n<p>SEEN_REPLY \u8bf4\u660e\u5df2\u7ecf\u76d1\u6d4b\u5230\u53cc\u5411\u53d1\u9001\u7684\u5305\uff0c\u53c2\u89c1ESTABLISHED<\/p>\n<p>\u5185\u6838\u7edf\u8ba1<\/p>\n<p>\u5185\u6838\u4f1a\u81ea\u52a8\u7edf\u8ba1\u901a\u8fc7iptables\u7684\u6bcf\u4e00\u6761\u89c4\u5219\u7684\u5305\u548c\u5b57\u8282\u3002<\/p>\n<p>\u4f8b\u5982\uff0ceth0\u4ee3\u8868\u5185\u7f51\uff0ceth1\u4ee3\u8868\u5916\u7f51<\/p>\n<pre>iptables -A FORWARD -i eth1\r\niptables -A FORWARD -o eth1\r\niptables -A INPUT -i eth1\r\niptables -A OUTPUT -o eth1<\/pre>\n<p>iptables\u8bb0\u5f55\u4e86\u4e0e\u5916\u7f51\u7684\u4ea4\u6362\u7684\u5305\u548c\u6d41\u91cf\u6570\uff0c\u901a\u8fc7iptables -L -v\u67e5\u770b INPUT\u548cOUTPUT\u7684\u5305\u548c\u6d41\u91cf\u5982\u4e0b<\/p>\n<pre>Chain INPUT (policy ACCEPT 27 packets, 1728 bytes)\r\npkts bytes target prot opt in out source destination\r\n3 192 all -- eth1 any anywhere anywhere\r\nChain FORWARD (policy ACCEPT 0 packets, 0 bytes)\r\npkts bytes target prot opt in out source destination\r\n0 0 all -- eth1 any anywhere anywhere\r\n0 0 all -- any eth1 anywhere anywhere\r\nChain OUTPUT (policy ACCEPT 21 packets, 2744 bytes)\r\npkts bytes target prot opt in out source destination\r\n3 192 all -- any eth1 anywhere anywhere<\/pre>\n<p>\u5982\u67e5\u60f3\u6307\u5b9a\u54ea\u4e9b\u5305\u901a\u8fc7NAT\uff0c\u628a\u5305-j(jump)\u5230\u7279\u6b8a\u76ee\u6807ACCEPT.\u8981\u65e9\u4e8e\u5176\u4ed6NAT\u89c4\u5219<\/p>\n<pre>iptables -t nat -i eth1 ... -j ACCEPT<\/pre>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6765\u81ea\u4e8e Linux iptables Pocket Reference CentOS\u7684iptables\u89c4\u5219\u4fdd\u5b58\u5728\/etc\/sysconfig\/iptables \u67e5\u770biptables\u7684\u542f\u52a8\u7ea7\u522b [root@localhost ~]# chkconfig &#8211;list iptables iptables 0:off 1:off 2:on 3:on 4:on 5:on 6:off \u8c03\u6574\u542f\u52a8\u7ea7\u522b\u53ef\u4ee5\u7528\u5982\u4e0b\u547d\u4ee4 chkconfig &#8211;levels 345 iptables on \u542f\u52a8iptables service iptables start \u505c\u7528iptables service iptables stop \u4e00\u4e9b\u4f2a\u6587\u4ef6\uff1a(\u5b58\u5728\u4e8e\/proc) \/etc\/sysctl.conf\u5728\u542f\u52a8\u91cc\u521b\u5efa\u4e86\/proc\/sys\uff0c\u5982\u914d\u7f6epptp-vpn\u7684\u65f6\u5019\uff0c\u5728sysctl.conf\u91cc\u52a0\u5165net.ipv4.ip_forward=1\u5f00\u673a\u540e\uff0c\u67e5\u770b\/proc\/sys\/net\/ipv4\/ip_forward\uff0c\u5c31\u4f1a\u53d1\u73b0\u53d8\u4e3a1. \/proc\/sys\/net\/ipv4\/ip_conntrack_max\uff0c\u5f53\u51fa\u73b0\u201cip_conntrack: table\u00a0full, dropping packet\u201d\u9519\u8bef\u65f6\uff0c\u4f60\u9700\u8981\u5728\/etc\/sysctl.conf\u52a0\u503c\u3002 \u7528uname -r\u53ef\u67e5\u770b\u5185\u6838\u7248\u672c\u4fe1\u606f uname -a\u67e5\u770b\u5168\u90e8\u4fe1\u606f\uff0c\u5177\u4f53\u89c1(manpage of uname). \u51e0\u4e2a\u72b6\u6001\u7684\u8bf4\u660e ESTABLISHED \u5df2\u7ecf\u76d1\u6d4b\u5230\u53cc\u5411\u53d1\u9001\u7684\u5305 INVALID \u4ec0\u4e48\u90fd\u6ca1\u6709 NEW \u6709\u65b0\u7684\u8fde\u63a5\u6216\u76d1\u6d4b\u5230\u4e00\u90e8\u5206 RELATED \u6709\u65b0\u7684\u8fde\u63a5\uff0c\u4e14\u65b0\u8fde\u63a5\u662f\u57fa\u4e8e\u5df2\u6709\u8fde\u63a5 [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[92],"tags":[23],"class_list":["post-2964","post","type-post","status-publish","format-standard","hentry","category-iptables","tag-summary"],"_links":{"self":[{"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/posts\/2964","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/jpuyy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2964"}],"version-history":[{"count":9,"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/posts\/2964\/revisions"}],"predecessor-version":[{"id":5530,"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/posts\/2964\/revisions\/5530"}],"wp:attachment":[{"href":"https:\/\/jpuyy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2964"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jpuyy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2964"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jpuyy.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2964"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}