{"id":129,"date":"2010-06-06T12:06:04","date_gmt":"2010-06-06T04:06:04","guid":{"rendered":"http:\/\/www.ipcpu.com\/?p=129"},"modified":"2010-06-06T12:06:04","modified_gmt":"2010-06-06T04:06:04","slug":"linux-nat-iptables","status":"publish","type":"post","link":"https:\/\/c.ipcpu.com\/2010\/06\/linux-nat-iptables\/","title":{"rendered":"linux\u4e0b\u57fa\u4e8eipables\u7684NAT\u7684\u914d\u7f6e"},"content":{"rendered":"

iptables \u662f\u4e00\u4e2a\u72b6\u6001\u5305\u68c0\u6d4b\u9632\u706b\u5899stateful packet inspection\u3002<\/p>\n

\u5b9e\u9645\u4e0a\u7531netfilter\u548ciptables\u4e24\u4e2a\u7ec4\u4ef6\u6784\u6210\u3002netfilter\u662f\u96c6\u6210\u5728\u5185\u6838\u4e2d\u7684\u4e00\u90e8\u5206\uff0c\u5176\u4f5c\u7528\u662f\u5b9a\u4e49\u3001\u4fdd\u5b58\u76f8\u5e94\u7684\u89c4\u5219\uff0c\u800ciptables\u662f\u4e00\u79cd\u5de5\u5177\uff0c\u7528\u6765\u4fee\u6539\u4fe1\u606f\u7684\u8fc7\u6ee4\u89c4\u5219\u53ca\u5176\u4ed6\u914d\u7f6e\u3002<\/p>\n

netfilter\u662fLinux\u6838\u5fc3\u4e2d\u7684\u4e00\u4e2a\u901a\u7528\u67b6\u6784\uff0c\u5176\u63d0\u4f9b\u4e86\u4e00\u7cfb\u5217\u7684\u8868\uff08tables\uff09,\u6bcf\u4e2a\u8868\u7531\u82e5\u5e72\u4e2a\u94fe\uff08chains\uff09\u7ec4\u6210\uff0c\u800c\u6bcf\u6761\u94fe\u53ef\u4ee5\u7531\u4e00\u6761\u6216\u82e5\u5e72\u6761\u89c4\u5219\uff08rules\uff09\u7ec4\u6210\u3002<\/p>\n

\u8be6\u7ec6\u7684\u53ef\u4ee5\u53c2\u89c1 \u53c2\u8003\u8d44\u6599 1 2<\/p>\n

\u73af\u5883\uff1alinux .winxp\u4e24\u53f0
\nLinux eth2:ip:10.1.10.251 \u63a5\u5916\u7f51<\/p>\n

linux eth1:ip:6.6.6.6 \u00a0\u63a5\u5185\u7f51\uff08winxp\uff09<\/p>\n

1\u3001\u914d\u7f6e\u9ed8\u8ba4\u7b56\u7565<\/p>\n

\u5f00\u542f\u8f6c\u53d1\uff1a\u4fee\u6539\/etc\/sysctl.conf\u7684net.ipv4.ip_forward=1
\n#\u4e0d\u8981\u4fee\u6539\/proc\/sys\/net\/ipv4\/ip_forward\u91cd\u542f\u4e0d\u4fdd\u5b58<\/p>\n

iptables -F\uff1a\u6e05\u7a7a\u6240\u9009\u94fe\u4e2d\u7684\u89c4\u5219\uff0c\u5982\u679c\u6ca1\u6709\u6307\u5b9a\u94fe\u5219\u6e05\u7a7a\u6307\u5b9a\u8868\u4e2d\u6240\u6709\u94fe\u7684\u89c4\u5219
\niptables -X\uff1a\u6e05\u9664\u9884\u8bbe\u8868filter\u4e2d\u4f7f\u7528\u8005\u81ea\u5b9a\u94fe\u4e2d\u7684\u89c4\u5219
\niptables -Z\uff1a\u6e05\u9664\u9884\u8bbe\u8868filter\u4e2d\u4f7f\u7528\u8005\u81ea\u5b9a\u94fe\u4e2d\u7684\u89c4\u5219<\/p>\n

iptables -P INPUT DROP
\niptables -P FORWARD DROP<\/p>\n

2.\u5141\u8bb8\u73af\u56de<\/p>\n

iptables -A INPUT -i lo -j ACCEPT<\/p>\n

3.\u8fde\u63a5\u72b6\u6001\u8bbe\u7f6e<\/span><\/p>\n

iptables -A INPUT -m state \u2013state ESTABLISHED,RELATED -j ACCEPT
\niptables -A FORWARD -m state \u2013state ESTABLISHED,RELATED -j ACCEPT<\/p>\n

4.\u5b9e\u65bdNAT<\/p>\n

iptables -t nat -A POSTROUTING -j MASQUERADE
\n#\u6b64\u8bbe\u7f6e\u6bd4\u8f83\u5371\u9669\uff0c\u63a8\u8350\u6309\u7167\u5165\u63a5\u53e3\uff0c\u6e90\u5730\u5740\uff0c\u51fa\u63a5\u53e3\u8fdb\u884cNAT
\n#\u8be5\u8bbe\u7f6e\u4f1a\u4f7f\u6240\u6709\u63a5\u53e3\u90fd\u6210\u4e3aNAT\u5165\u63a5\u53e3\u5305\u62eceth2<\/p>\n

5.\u5141\u8bb8\u5185\u90e8\u4e0a\u7f51<\/p>\n

iptables -A FORWARD -p tcp \u2013dport 80 -j ACCEPT
\niptables -A FORWARD -p tcp \u2013dport 53 -j ACCEPT
\niptables -A FORWARD -p udp \u2013dport 53 -j ACCEPT<\/p>\n

6.\u4fdd\u5b58
\niptables-save\u6216service iptables save
\n7.\u6d4b\u8bd5\uff0cok\uff0cQQ\u80fd\u4e0a\uff0c\u7f51\u9875\u80fd\u4e0a
\n\u53c2\u8003\u8d44\u6599\uff1a
\n1.http:\/\/redking.blog.51cto.com\/27212\/143185
\n2.http:\/\/linux.vbird.org\/linux_server\/0250simple_firewall.php<\/p>\n

\n

\u7cbe\u5f69\u8bc4\u8bba\uff1a<\/p>\n

\u00a0wss8848 | #1
\nJune 6, 2010 at 2:12 pm
\nip6tables \u64cd\u4f5c\u57fa\u672c\u76f8\u540c \u65e0NAT\u8868<\/p>\n

\u6613\u68cb\u724c | #2
\nJune 7, 2010 at 2:14 pm
\n\u4e0d\u9519 \u54e6\u201c\u201c`<\/p>\n

rayyn | #3
\nJune 11, 2010 at 6:40 pm
\nv4\u7684NAT\u5f88\u5f3a\u5927\u3002\u3002VPN\u5168\u9760\u5b83\u4e86\u3002\u3002
\nv6\u6ca1NAT\u4e86\u3002\u3002\u5e0c\u671bv6\u65e9\u65e5\u666e\u53ca\u3002\u3002<\/p>\n

rayyn | #4
\nJune 11, 2010 at 6:41 pm
\n\u3002\u3002\u3002\u534a\u5929\u6ca1\u6253\u5f00\u3002\u3002\u3002
\nDNS lookup failure for: ggssl.com\u3002\u3002<\/p>\n

\u8f6c\u8f7d\u8bf7\u6ce8\u660e\uff1aIPCPU-\u7f51\u7edc\u4e4b\u8def<\/a> » linux\u4e0b\u57fa\u4e8eipables\u7684NAT\u7684\u914d\u7f6e<\/a><\/p>","protected":false},"excerpt":{"rendered":"

iptables \u662f\u4e00\u4e2a\u72b6\u6001\u5305\u68c0\u6d4b\u9632\u706b\u5899stateful packet inspection\u3002 \u5b9e\u9645\u4e0a\u7531netfilter\u548ciptables\u4e24\u4e2a\u7ec4\u4ef6\u6784\u6210\u3002netfilter\u662f\u96c6\u6210\u5728\u5185\u6838\u4e2d\u7684\u4e00\u90e8\u5206\uff0c\u5176\u4f5c\u7528\u662f\u5b9a\u4e49\u3001\u4fdd\u5b58\u76f8\u5e94\u7684\u89c4\u5219\uff0c\u800ciptables\u662f\u4e00\u79cd\u5de5\u5177\uff0c\u7528\u6765\u4fee\u6539\u4fe1\u606f\u7684\u8fc7\u6ee4\u89c4\u5219\u53ca\u5176\u4ed6\u914d\u7f6e\u3002 netfilter\u662fLinux\u6838\u5fc3\u4e2d\u7684\u4e00\u4e2a\u901a\u7528\u67b6\u6784\uff0c\u5176\u63d0\u4f9b\u4e86\u4e00\u7cfb\u5217\u7684\u8868\uff08tables\uff09,\u6bcf\u4e2a\u8868\u7531\u82e5\u5e72\u4e2a\u94fe\uff08chains\uff09\u7ec4\u6210\uff0c\u800c\u6bcf\u6761\u94fe\u53ef\u4ee5\u7531\u4e00\u6761\u6216\u82e5\u5e72\u6761\u89c4\u5219\uff08rules\uff09\u7ec4\u6210\u3002 \u8be6\u7ec6\u7684\u53ef\u4ee5\u53c2\u89c1 \u53c2\u8003\u8d44\u6599 1 2 \u73af\u5883\uff1alinux .winxp\u4e24\u53f0 Linux eth2:ip:10.1.10.251 \u63a5\u5916\u7f51 linux eth1:ip:6.6.6.6 \u00a0\u63a5\u5185\u7f51\uff08winxp\uff09 1\u3001\u914d\u7f6e\u9ed8\u8ba4\u7b56\u7565 \u5f00\u542f\u8f6c\u53d1\uff1a\u4fee\u6539\/etc\/sysctl.conf\u7684net.ipv4.ip_forward=1 #\u4e0d\u8981\u4fee\u6539\/proc\/sys\/net\/ipv4\/ip_forward\u91cd\u542f\u4e0d\u4fdd\u5b58 iptables -F\uff1a\u6e05\u7a7a\u6240\u9009\u94fe\u4e2d\u7684\u89c4\u5219\uff0c\u5982\u679c\u6ca1\u6709\u6307\u5b9a\u94fe\u5219\u6e05\u7a7a\u6307\u5b9a\u8868\u4e2d\u6240\u6709\u94fe\u7684\u89c4\u5219 iptables -X\uff1a\u6e05\u9664\u9884\u8bbe\u8868filter\u4e2d\u4f7f\u7528\u8005\u81ea\u5b9a\u94fe\u4e2d\u7684\u89c4\u5219 iptables -Z\uff1a\u6e05\u9664\u9884\u8bbe\u8868filter\u4e2d\u4f7f\u7528\u8005\u81ea\u5b9a\u94fe\u4e2d\u7684\u89c4\u5219 iptables -P INPUT DROP iptables -P FORWARD DROP 2.\u5141\u8bb8\u73af\u56de iptables -A INPUT -i lo -j ACCEPT 3.\u8fde\u63a5\u72b6\u6001\u8bbe\u7f6e iptables -A INPUT -m state \u2013state ESTABLISHED,RELATED -j ACCEPT iptables -A […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[3],"tags":[],"_links":{"self":[{"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/posts\/129"}],"collection":[{"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/comments?post=129"}],"version-history":[{"count":0,"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/posts\/129\/revisions"}],"wp:attachment":[{"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/media?parent=129"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/categories?post=129"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/tags?post=129"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}