{"id":222,"date":"2021-05-28T21:21:34","date_gmt":"2021-05-28T13:21:34","guid":{"rendered":"https:\/\/www.buyao007.icu\/?p=222"},"modified":"2021-05-28T21:21:34","modified_gmt":"2021-05-28T13:21:34","slug":"iptables%e9%98%b2%e7%81%ab%e5%a2%99","status":"publish","type":"post","link":"https:\/\/www.buyao007.icu\/?p=222","title":{"rendered":"iptables\u9632\u706b\u5899"},"content":{"rendered":"\n

\u5b59\u5bcc\u9633\uff0c \u6c5f\u6e56\u4eba\u79f0\u6ca1\u4eba\u79f0\u3002\u591a\u5e74\u4e92\u8054\u7f51\u8fd0\u7ef4\u5de5\u4f5c\u7ecf\u9a8c\uff0c\u66fe\u8d1f\u8d23\u8fc7\u5b59\u5e03\u65af\u5927\u89c4\u6a21\u96c6\u7fa4\u67b6\u6784\u81ea\u52a8\u5316\u8fd0\u7ef4\u7ba1\u7406\u5de5\u4f5c\u3002\u64c5\u957fWeb\u96c6\u7fa4\u67b6\u6784\u4e0e\u81ea\u52a8\u5316\u8fd0\u7ef4\uff0c\u66fe\u8d1f\u8d23\u56fd\u5185\u67d0\u5927\u578b\u535a\u5ba2\u7f51\u7ad9\u8fd0\u7ef4\u5de5\u4f5c\u3002<\/p>\n\n\n\n

1.iptables \u6267\u884c\u8fc7\u7a0b<\/h1>\n\n\n\n
1.\u9632\u706b\u5899\u662f\u5c42\u5c42\u8fc7\u6ee4\u7684\uff0c\u5b9e\u9645\u662f\u6309\u7167\u914d\u7f6e\u89c4\u5219\u7684\u987a\u5e8f\u4ece\u4e0a\u5230\u4e0b\uff0c\u4ece\u524d\u5230\u540e \u8fdb\u884c\u8fc7\u6ee4\u7684\u3002\n2. \u5982\u679c\u5339\u914d\u6210\u529f\u89c4\u5219\uff0c\u5373\u660e\u786e\u8868\u793a\u662f\u62d2\u7edd(DROP)\u8fd8\u662f\u63a5\u6536(ACCEPT)\uff0c\u6570 \u636e\u5305\u5c31\u4e0d\u518d\u5411\u4e0b\u5339\u914d\u65b0\u7684\u89c4\u5219\u3002\n3. \u5982\u679c\u89c4\u5219\u4e2d\u6ca1\u6709\u660e\u786e\u8868\u660e\u662f\u963b\u6b62\u8fd8\u662f\u901a\u8fc7\u7684\uff0c\u4e5f\u5c31\u662f\u6ca1\u6709\u5339\u914d\u89c4\u5219\uff0c\u5411\u4e0b\u8fdb\u884c\u5339\u914d\uff0c\u76f4\u5230\u5339\u914d\u9ed8\u8ba4\u89c4\u5219\u5f97\u5230\u660e\u786e\u7684\u963b\u6b62\u8fd8\u662f\u901a\u8fc7\u3002\n4. \u9632\u706b\u5899\u7684\u9ed8\u8ba4\u89c4\u5219\u662f\u6240\u6709\u89c4\u5219\u90fd\u5339\u914d\u5b8c\u624d\u4f1a\u5339\u914d\u7684\n<\/code><\/pre>\n\n\n\n
2.\u8868\u4e0e\u94fe<\/h1>\n\n\n\n
1 \u7b80\u4ecb<\/h2>\n\n\n\n
iptables \u662f 4\u8868\u4f0d\u94fe\n4\u8868: filter \u8868 nat\u8868 raw\u8868 mangle\u8868\n\u4f0d\u94fe: INPUT OUTPUT FORWARD PREROUTING POSTROUTING\npre.... \u4e4b\u524d\npost .....\u4e4b\u540e\n<\/code><\/pre>\n\n\n\n
2 \u6bcf\u4e2a\u8868\u8bf4\u660e<\/h2>\n\n\n\n
2.1filter\u8868<\/h3>\n\n\n\n
\u5b9e\u73b0\u9632\u706b\u5899\u529f\u80fd: \u5c4f\u853d\u6216\u51c6\u8bb8 \u7aef\u53e3 ip\n\u5f3a\u8c03\uff1a\u4e3b\u8981\u548c\u4e3b\u673a\u81ea\u8eab\u76f8\u5173\uff0c\u771f\u6b63\u8d1f\u8d23\u4e3b\u673a\u9632\u706b\u5899\u529f\u80fd\u7684 \uff08\u8fc7\u6ee4\u6d41\u5165\u6d41\u51fa\u4e3b\u673a\u7684\u6570\u636e\u5305\uff09 filter\u8868\u793aiptables\u9ed8\u8ba4 \u4f7f\u7528\u7684\u8868\uff0c\u8fd9\u4e2a\u8868\u5b9a\u4e49\u4e86\u4e09\u4e2a\u94fe\uff08chains\uff09 \u4f01\u4e1a\u5de5\u4f5c\u573a \u666f\uff1a\u4e3b\u673a\u9632\u706b\u5899\nINPUT\u94fe\uff1a\u8d1f\u8d23\u8fc7\u6ee4\u6240\u6709\u76ee\u6807\u5730\u5740\u662f\u672c\u673a\u5730\u5740\u7684\u6570\u636e\u5305 \u901a\u4fd7\u6765\u8bf4\uff1a \u5c31\u662f\u8fc7\u6ee4\u8fdb\u5165\u4e3b\u673a\u7684\u6570\u636e\u5305 (\u80fd\u5426\u8ba9\u6570\u636e\u5305\u8fdb\u5165\u670d\u52a1\u5668)\n<\/code><\/pre>\n\n\n\n
2.2nat\u8868<\/h3>\n\n\n\n
\u5b9e\u73b0nat\u529f\u80fd \u5b9e\u73b0\u5171\u4eab\u4e0a\u7f51(\u5185\u7f51\u670d\u52a1\u5668\u4e0a\u5916\u7f51) \u7aef\u53e3\u6620\u5c04\u548cip\u6620\u5c04\nnat\uff1a\u8d1f\u8d23\u7f51\u7edc\u5730\u5740\u8f6c\u6362\u7684\uff0c\u5373\u6765\u6e90\u4e0e\u76ee\u7684IP\u5730\u5740\u548cport \u7684\u8f6c\u6362\u3002 \u5e94\u7528\uff1a\u548c\u4e3b\u673a\u672c\u8eab\u65e0\u5173\uff0c\u4e00\u822c\u7528\u4e8e\u5c40\u57df\u7f51\u5171\u4eab\u4e0a\u7f51 \u6216\u8005\u7279\u6b8a\u7684\u7aef\u53e3\u8f6c\u6362\u670d\u52a1\u76f8\u5173\u3002\n\u5de5\u4f5c\u573a\u666f\uff1a 1. \u7528\u4e8e\u4f01\u4e1a\u8def\u7531\uff08zebra\uff09\u6216\u7f51\u5173\uff08iptables\uff09\uff0c\u5171 \u4eab\u4e0a\u7f51\uff08POSTROUTING\uff09 2. \u505a\u5185\u90e8\u5916\u90e8IP\u5730\u5740\u4e00\u5bf9\u4e00\u6620\u5c04\uff08dmz\uff09\uff0c\u786c\u4ef6\u9632 \u706b\u5899\u6620\u5c04IP\u5230\u5185\u90e8\u670d\u52a1\u5668\uff0cftp\u670d\u52a1 \uff08PREROUTING\uff09 3. WEB\uff0c\u5355\u4e2a\u7aef\u53e3\u7684\u6620\u5c04\uff0c\u76f4\u63a5\u6620\u5c0480\u7aef\u53e3 \uff08PREROUTING\uff09 \u8fd9\u4e2a\u8868\u5b9a\u4e49\u4e863\u4e2a\u94fe\uff0cnat\u529f\u80fd \u76f8\u5f53\u4e8e\u7f51\u7edc\u7684acl\u63a7\u5236\u3002\u548c\u7f51\u7edc\u4ea4\u6362\u673aacl\u7c7b\u4f3c\nPREROUTING\u94fe\uff1a\u5728\u6570\u636e\u5305\u5230\u8fbe\u9632\u706b\u5899\u65f6\uff0c\u8fdb\u884c\u8def\u7531\u5224\u65ad\u4e4b\u524d\u6267\u884c\u7684\u89c4\u5219\uff0c\u4f5c\u7528\u662f\u6539\u53d8\u6570\u636e\u5305\u7684\u76ee\u7684\u5730\u5740\u3001\u76ee\u7684\u7aef\u53e3\u7b49\u5c31\u662f\u6536\u4fe1\u65f6\uff0c\u6839\u636e\u89c4\u5219\u91cd\u5199\u6536\u4ef6\u4eba\u7684\u5730\u5740\u3002\u4f8b\u5982\uff1a\u628a\u516c\u7f51IP\uff1axxx.xxx.xxx.xxx\u6620\u5c04\u5230\u5c40\u57df\u7f51\u7684 xx.xx.xx.xx\u670d\u52a1\u5668\u4e0a\u3002 \u5982\u679c\u662fweb\u670d\u52a1\uff0c\u53ef\u4ee5\u62a580\u8f6c\u6362\u4e3a\u5c40\u57df\u7f51\u7684\u670d\u52a1\u5668 9000\u7aef\u53e3\u4e0a\nPOSTROUTING\u94fe\uff1a\u5728\u6570\u636e\u5305\u79bb\u5f00\u9632\u706b\u5899\u65f6\u8fdb\u884c\u8def\u7531\u5224\u65ad\u4e4b\u540e\u6267\u884c\u7684\u89c4 \u5219\uff0c\u4f5c\u7528\u6539\u53d8\u6570\u636e\u5305\u7684\u6e90\u5730\u5740\uff0c\u6e90\u7aef\u53e3\u7b49\u3002 \u5199\u597d\u53d1\u4ef6\u4eba\u7684\u5730\u5740\uff0c\u8981\u8ba9\u5bb6\u4eba\u56de\u4fe1\u65f6\u80fd\u591f\u6709\u5730\u5740\u53ef \u56de\u3002 \u4f8b\u5982\u3002\u9ed8\u8ba4\u7b14\u8bb0\u672c\u548c\u865a\u62df\u673a\u90fd\u662f\u5c40\u57df\u7f51\u5730\u5740\uff0c\u5728\u51fa \u7f51\u7684\u65f6\u5019\u88ab\u8def\u7531\u5668\u5c06\u6e90\u5730\u5740\u6539\u4e3a\u4e86\u516c\u7f51\u5730\u5740\u3002 \u751f\u4ea7\u5e94\u7528\uff1a\u5c40\u57df\u7f51\u5171\u4eab\u4e0a\u7f51\u3002\n<\/code><\/pre>\n\n\n\n
3.\u73af\u5883\u51c6\u5907\u53ca\u76f8\u5173\u547d\u4ee4<\/h1>\n\n\n\n
1.\u73af\u5883\u51c6\u5907<\/h2>\n\n\n\n
m01<\/td>10.0.0.61\uff1b172.16.1.61<\/td><\/tr>
web01<\/td>10.0.0.7 172.16.1.7<\/td><\/tr>
web02<\/td>10.0.0.8 172.16.1.8<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
[root@m01 ~]# yum install -y iptables-services\n[root@m01 ~]#  rpm -ql   iptables-services\n\/etc\/sysconfig\/ip6tables\n\/etc\/sysconfig\/iptables                   #\u9632\u706b \u5899\u7684\u914d\u7f6e\u6587\u4ef6\n\/usr\/lib\/systemd\/system\/ip6tables.service\n\/usr\/lib\/systemd\/system\/iptables.service#\u9632\u706b \u5899\u670d\u52a1\u914d\u7f6e\u6587\u4ef6(\u547d\u4ee4)\n<\/code><\/pre>\n\n\n\n
[root@m01 ~]# rpm -ql iptables\n\/usr\/sbin\/iptables     #iptables \u547d\u4ee4 \u6dfb\u52a0\/\u5220\u9664\/\u67e5 \u770b \u89c4\u5219(4\u8868\u4f0d\u94fe)\n\/usr\/sbin\/iptables-save  #iptables\u89c4\u5219 \u8f93\u51fa(\u4fdd\u5b58)\n\/usr\/sbin\/iptables-restore   # \u6062\u590d\n<\/code><\/pre>\n\n\n\n
#\u9632\u706b\u5899\u76f8\u5173\u6a21\u5757 \u52a0\u8f7d\u5230\u5185\u6838\u4e2d\uff08\u4e34\u65f6\uff09<\/p>\n\n\n\n
[root@m01 ~]# modprobe ip_tables\n[root@m01 ~]# modprobe iptable_filter\n[root@m01 ~]# modprobe iptable_nat\n[root@m01 ~]# modprobe ip_conntrack\n[root@m01 ~]# modprobe ip_conntrack_ftp\n[root@m01 ~]# modprobe ip_nat_ftp\n[root@m01 ~]# modprobe ipt_state\n<\/code><\/pre>\n\n\n\n
#\u6c38\u4e45<\/p>\n\n\n\n
[root@m01 ~]# cat >>\/etc\/rc.local<<EOF\n> modprobe ip_tables\n> modprobe iptable_filter\n> modprobe iptable_nat\n> modprobe ip_conntrack\n> modprobe ip_conntrack_ftp\n> modprobe ip_nat_ftp\n> modprobe ipt_state \n> EOF\n<\/code><\/pre>\n\n\n\n
\u68c0\u67e5\u662f\u5426\u52a0\u5165<\/p>\n\n\n\n
[root@m01 ~]# lsmod |egrep 'filter|nat|ipt'\nnf_nat_ftp             12809  0 \nnf_conntrack_ftp       18478  1 nf_nat_ftp\niptable_nat            12875  0 \nnf_nat_ipv4            14115  1 iptable_nat\nnf_nat                 26583  2 nf_nat_ftp,nf_nat_ipv4\nnf_conntrack          139264  6 nf_nat_ftp,nf_nat,xt_state,nf_nat_ipv4,nf_conntrack_ftp,nf_conntrack_ipv4\niptable_filter         12810  0 \nip_tables              27126  2 iptable_filter,iptable_nat\nlibcrc32c              12644  3 xfs,nf_nat,nf_conntrack\n<\/code><\/pre>\n\n\n\n
\u5173\u95ed\u81ea\u5e26\u9632\u706b\u5899\u5e76\u542f\u52a8iptables<\/p>\n\n\n\n
[root@m01 ~]# systemctl stop firewalld\n[root@m01 ~]# systemctl disable firewalld\n[root@m01 ~]# systemctl start iptables.service \n[root@m01 ~]# systemctl enable iptables.service \nCreated symlink from \/etc\/systemd\/system\/basic.target.wants\/iptables.service to \/usr\/lib\/systemd\/system\/iptables.service.\n<\/code><\/pre>\n\n\n\n
#\u67e5\u770bfilter\u8868\u4e2d\u7684\u89c4\u5219 ,\u9ed8\u8ba4\u67e5\u770b\u7684\u662ffilter\u8868<\/p>\n\n\n\n
[root@m01 ~]# iptables -nL<\/code><\/pre>\n\n\n\n
#\u67e5\u770b\u6307\u5b9a\u8868\u4e2d\u7684\u89c4\u5219<\/p>\n\n\n\n
[root@m01 ~]# iptables -t nat -nL<\/code><\/pre>\n\n\n\n
2.iptables\u547d\u4ee4\u53c2\u6570<\/h2>\n\n\n\n
\u53c2\u6570<\/td>\u542b\u4e49<\/td><\/tr>
-L<\/td>\u663e\u793a\u8868\u4e2d\u7684\u6240\u6709\u89c4\u5219<\/td><\/tr>
-n<\/td>\u4e0d\u8981\u628a\u7aef\u53e3 \u6216ip\u53cd\u5411\u89e3\u6790\u4e3a\u540d\u5b57<\/td><\/tr>
-t<\/td>\u6307\u5b9a\u8868 \u4e0d\u6307\u5b9a\u9ed8\u8ba4\u662ffilter\u8868<\/td><\/tr>
-A<\/td>\u8ffd\u52a0 \u52a0\u5165\u51c6\u8bb8\u7c7b\u89c4\u5219 \u4f7f\u7528-A<\/td><\/tr>
-I<\/td>insert \u628a\u89c4\u5219\u52a0\u5728\u94fe\u7684\u7b2c1\u6761 \u62d2\u7edd\u7c7b\u89c4\u5219\u653e\u5728\u6240\u6709 \u89c4\u5219\u6700\u4e0a\u9762 \u62d2\u7edd\u7c7b -I<\/td><\/tr>
-D<\/td>delete \u5220\u9664 -D INPUT 1<\/td><\/tr>
-p<\/td>\u534f\u8bae protocal tcp\/udp\/icmp\/all<\/td><\/tr>
--dport<\/td>\u76ee\u6807\u7aef\u53e3 dest destination \u6307\u5b9a\u7aef\u53e3 \u52a0\u4e0a\u534f\u8bae -p tcp<\/td><\/tr>
--sport<\/td>\u6e90\u7aef\u53e3 source \u6e90<\/td><\/tr>
-s<\/td>--source \u6e90ip<\/td><\/tr>
-d<\/td>--destination \u76ee\u6807ip<\/td><\/tr>
-m<\/td>\u6307\u5b9a\u6a21\u5757 multiport<\/td><\/tr>
-i<\/td>input \u8f93\u5165\u7684\u65f6\u5019 \u4ece\u54ea\u4e2a\u7f51\u5361\u8fdb\u6765<\/td><\/tr>
-o<\/td>ouput \u8f93\u51fa\u7684\u65f6\u5019 \u4ece\u54ea\u4e2a\u7f51\u5361\u51fa\u53bb<\/td><\/tr>
-j<\/td>\u6ee1\u8db3\u6761\u4ef6\u540e\u7684\u52a8\u4f5c:DROP\/ACCEPT\/REJECT DROP REJECT\u62d2\u7edd DROP \u628a\u6570\u636e\u4e22\u6389 \u4e0d\u4f1a\u8fd4\u56de\u4fe1\u606f\u7ed9\u7528\u6237 REJECT \u62d2\u7edd \u8fd4\u56de\u62d2\u7edd\u4fe1\u606f<\/td><\/tr>
-F<\/td>\u6e05\u9664\u6240\u6709\u89c4\u5219\uff0c\u4e0d\u4f1a\u5904\u7406\u9ed8\u8ba4\u7684\u89c4\u5219<\/td><\/tr>
-X<\/td>\u5220\u9664\u7528\u6237\u81ea\u5b9a\u4e49\u7684\u94fe<\/td><\/tr>
-Z<\/td>\u94fe\u7684\u8ba1\u6570\u5668\u6e05\u96f6\uff08\u6570\u636e\u5305\u8ba1\u6570\u5668\u4e0e\u6570\u636e\u5305\u5b57\u8282\u8ba1\u6570\u5668\uff09<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
3 \u914d\u7f6efilter\u8868\u89c4\u5219<\/h2>\n\n\n\n
3.1\u6b63\u5f0f\u914d\u7f6e\u4e4b\u524d\u5148\u6e05\u7a7a\u89c4\u5219<\/h3>\n\n\n\n
[root@m01 ~]# iptables -F\n[root@m01 ~]# iptables -X\n[root@m01 ~]# iptables -Z\n[root@m01 ~]# iptables -nL\nChain INPUT (policy ACCEPT)\ntarget     prot opt source               destination         \nChain FORWARD (policy ACCEPT)\ntarget     prot opt source               destination         \nChain OUTPUT (policy ACCEPT)\ntarget     prot opt source               destination         \n<\/code><\/pre>\n\n\n\n
3.2\u7981\u6b62\u8bbf\u95ee22\u7aef\u53e3<\/h3>\n\n\n\n
[root@m01 ~]# iptables -t filter -A INPUT -p tcp --dport 22 -j DROP  ###\u62d2\u7edd\u7528\u6237\u8bbf\u95ee22\u7aef\u53e3\uff08\u5371\u9669\uff0c\u4e00\u4f1a\u8981\u8dd1\u673a\u623f\uff09\n#\u6b64\u65f6\u53d1\u73b0Xshell\u5df2\u7ecf\u65e0\u6cd5\u8fdb\u884c\u64cd\u4f5c\u4e86\n#\u8fdb\u5165\u673a\u623f\n#\u67e5\u770b\u89c4\u5219\u5e76\u52a0\u4e0a\u5e8f\u53f7\n[root@m01 ~]# iptables -t filter -nL --line-number\n#\u5220\u9664\u89c4\u5219\niptables -t filter  -D INPUT  1   #\u6839\u636e\u5e8f\u53f7\u5220\u9664<\/code><\/pre>\n\n\n\n
3.3 \u5c01ip \u5c4f\u853d\u67d0\u4e2aip<\/h3>\n\n\n\n
#\u62d2\u7edd10.0.0.7\u8bbf\u95ee     <\/p>\n\n\n\n
[root@m01 ~]# iptables -t filter -I INPUT -s 10.0.0.7 -j DROP\n[root@m01 ~]# iptables  -t filter -nL --line-number\nChain INPUT (policy ACCEPT)\nnum  target     prot opt source               destination         \n1    DROP       all  --  10.0.0.7             0.0.0.0\/0           \nChain FORWARD (policy ACCEPT)\nnum  target     prot opt source               destination         \nChain OUTPUT (policy ACCEPT)\nnum  target     prot opt source               destination\n<\/code><\/pre>\n\n\n\n
#\u62d2\u7edd\u67d0\u4e2a\u7f51\u6bb5\u7684\u8bbf\u95ee<\/p>\n\n\n\n
[root@m01 ~]# iptables -I INPUT -s 172.16.1.0\/24 -j DROP \n[root@m01 ~]# iptables  -t filter -nL --line-number\nChain INPUT (policy ACCEPT)\nnum  target     prot opt source               destination         \n1    DROP       all  --  172.16.1.0\/24        0.0.0.0\/0           \n2    DROP       all  --  10.0.0.7             0.0.0.0\/0           \nChain FORWARD (policy ACCEPT)\nnum  target     prot opt source               destination         \nChain OUTPUT (policy ACCEPT)\nnum  target     prot opt source               destination     \n<\/code><\/pre>\n\n\n\n
#\u7981\u6b62\u7f51\u6bb5\u8fde\u5165\uff08\u7981\u6b6210.0.0.0\/24\u7f51\u6bb5\u8bbf\u95ee 8888\u7aef\u53e3\uff09<\/p>\n\n\n\n
[root@m01 ~]# iptables -I INPUT  -s 10.0.0.0\/24  -p tcp  --dport 8080 -j DROP \n[root@m01 ~]# iptables  -t filter -nL --line-number\nChain INPUT (policy ACCEPT)\nnum  target     prot opt source               destination         \n1    DROP       tcp  --  10.0.0.0\/24          0.0.0.0\/0            tcp dpt:8080\n2    DROP       all  --  172.16.1.0\/24        0.0.0.0\/0           \n3    DROP       all  --  10.0.0.7             0.0.0.0\/0           \nChain FORWARD (policy ACCEPT)\nnum  target     prot opt source               destination         \nChain OUTPUT (policy ACCEPT)\nnum  target     prot opt source               destination       \n<\/code><\/pre>\n\n\n\n
3.4\u53ea\u5141\u8bb8\u6307\u5b9a\u7f51\u6bb5\u8fde\u5165\uff08\u5141\u8bb8172.16.1.0\u7f51\u6bb5\uff09<\/h3>\n\n\n\n
#\u65b9\u6cd51: \u5229\u7528 ! \u8fdb\u884c\u6392\u9664<\/p>\n\n\n\n
[root@m01 ~]# iptables -I INPUT ! -s 172.16.1.0\/24  -j DROP<\/code><\/pre>\n\n\n\n
#\u65b9\u6cd52: \u4fee\u6539\u94fe\u9ed8\u8ba4\u89c4\u5219 \u4fee\u6539\u4e3a\u62d2\u7edd \u6dfb\u52a0\u51c6\u8bb8<\/p>\n\n\n\n
[root@m01 ~]# iptables -P INPUT DROP\n[root@m01 ~]# iptables -nL\nChain INPUT (policy DROP)####\u5df2\u7ecf\u53d8\u4e3a\u62d2\u7edd\u4e86\ntarget     prot opt source               destination         \nACCEPT     all  --  10.0.0.0\/24          0.0.0.0\/0           \nChain FORWARD (policy ACCEPT)\ntarget     prot opt source               destination         \nChain OUTPUT (policy ACCEPT)\ntarget     prot opt source               destination         \n#\u6d4b\u8bd5\u5b8c\u6210\u540e \u4fee\u6539\u56de\u53bb\n[root@m01 ~]# iptables  -P INPUT ACCEPT\n[root@m01 ~]# iptables -nL\nChain INPUT (policy ACCEPT)\ntarget     prot opt source               destination         \nACCEPT     all  --  10.0.0.0\/24          0.0.0.0\/0           \nChain FORWARD (policy ACCEPT)\ntarget     prot opt source               destination         \nChain OUTPUT (policy ACCEPT)\ntarget     prot opt source               destination\n<\/code><\/pre>\n\n\n\n
3.5 \u6307\u5b9a\u591a\u4e2a\u7aef\u53e3<\/h3>\n\n\n\n
#\u6307\u5b9a\u591a\u4e2a\u7aef\u53e3<\/p>\n\n\n\n
-m multiport   -p tcp   --dport 80,443\n[root@m01 ~]# iptables -t filter -A INPUT -m multiport -p tcp --dport 80,443 -j ACCEPT \n[root@m01 ~]# iptables -nL\n<\/code><\/pre>\n\n\n\n
3.6\u5339\u914dICMP\u7c7b\u578b<\/h3>\n\n\n\n
###\u901a\u8fc7\u9632\u706b\u5899\u8bbe\u7f6e<\/p>\n\n\n\n
[root@m01 ~]# iptables -I INPUT -p icmp --icmp-type 8 -j DROP \n[root@m01 ~]# iptables -nL\nChain INPUT (policy ACCEPT)\ntarget     prot opt source               destination         \nDROP       icmp --  0.0.0.0\/0            0.0.0.0\/0            icmptype 8\nChain FORWARD (policy ACCEPT)\ntarget     prot opt source               destination         \nChain OUTPUT (policy ACCEPT)\ntarget     prot opt source               destination    \n<\/code><\/pre>\n\n\n\n
###\u901a\u8fc7\u5185\u6838\u53c2\u6570\u8bbe\u7f6e<\/p>\n\n\n\n
[root@m01 ~]# echo \"net.ipv4.icmp_echo_ignore_all = 1\" >> \/etc\/sysctl.conf\n[root@m01 ~]# sysctl -p\nnet.ipv4.icmp_echo_ignore_all = 1\n[root@m01 ~]# cat \/proc\/sys\/net\/ipv4\/icmp_echo_ignore_all\n1\n<\/code><\/pre>\n\n\n\n
3.7 \u9650\u5236\u5e76\u53d1\u53ca\u901f\u7387<\/h3>\n\n\n\n
-m limit \u9650\u5236\u6a21\u5757<\/p>\n\n\n\n
-m limit --limit 10\/minute     #\u6bcf\u5206\u949f\u53ea\u80fd\u670910\u4e2a\u6570\u636e\u5305 \u6bcf6\u79d2 \u751f\u6210<\/p>\n\n\n\n
iptables -I INPUT  -p icmp  -m limit --limit 10\/minute    --limit-burst 5   -j ACCEPT<\/p>\n\n\n\n
3.8 \u9632\u706b\u5899\u89c4\u5219\u7684\u4fdd\u5b58\u4e0e\u6062\u590d<\/h3>\n\n\n\n
iptables-save \u9ed8\u8ba4\u8f93\u51fa\u5230\u5c4f\u5e55<\/p>\n\n\n\n
iptables-restore \u52a0\u4e0a\u6587\u4ef6<\/p>\n\n\n\n
\u5199\u5165\u5230\/etc\/sysconfig\/iptables<\/p>\n\n\n\n
####\u4fdd\u5b58<\/p>\n\n\n\n
[root@m01 ~]# iptables-save >\/etc\/sysconfig\/iptables\n[root@m01 ~]# cat \/etc\/sysconfig\/iptables\n# Generated by iptables-save v1.4.21 on Fri May 28 16:52:58 2021\n*nat\n:PREROUTING ACCEPT [55:8594]\n:INPUT ACCEPT [27:6329]\n:OUTPUT ACCEPT [113:7357]\n:POSTROUTING ACCEPT [113:7357]\nCOMMIT\n# Completed on Fri May 28 16:52:58 2021\n# Generated by iptables-save v1.4.21 on Fri May 28 16:52:58 2021\n*filter\n:INPUT ACCEPT [30:2576]\n:FORWARD ACCEPT [0:0]\n:OUTPUT ACCEPT [364:46616]\n-A INPUT -s 10.0.0.0\/24 -j ACCEPT\n-A INPUT -s 10.0.0.0\/24 -p icmp -m icmp --icmp-type 8 -j DROP\nCOMMIT\n# Completed on Fri May 28 16:52:58 2021\n<\/code><\/pre>\n\n\n\n
###\u5220\u9664\u540e\u7684\u6062\u590d<\/p>\n\n\n\n
[root@m01 ~]# iptables -D INPUT 1\n[root@m01 ~]# iptables -D INPUT 1\n[root@m01 ~]# iptables -D INPUT 1\niptables: Index of deletion too big.\n[root@m01 ~]# iptables -nL\nChain INPUT (policy ACCEPT)\ntarget     prot opt source               destination         \nChain FORWARD (policy ACCEPT)\ntarget     prot opt source               destination         \nChain OUTPUT (policy ACCEPT)\ntarget     prot opt source               destination         \n[root@m01 ~]# iptables-restore < \/etc\/sysconfig\/iptables\n[root@m01 ~]# iptables -nL\nChain INPUT (policy ACCEPT)\ntarget     prot opt source               destination         \nACCEPT     all  --  10.0.0.0\/24          0.0.0.0\/0           \nDROP       icmp --  10.0.0.0\/24          0.0.0.0\/0            icmptype 8\nChain FORWARD (policy ACCEPT)\ntarget     prot opt source               destination         \nChain OUTPUT (policy ACCEPT)\ntarget     prot opt source               destination         \n<\/code><\/pre>\n\n\n\n
4. nat\u8868\u89c4\u5219<\/h2>\n\n\n\n
4.1 \u5b9e\u73b0\u5171\u4eab\u4e0a\u7f51<\/h3>\n\n\n\n
##\u9632\u706b\u5899\u914d\u7f6e<\/p>\n\n\n\n
[root@m01 ~]# iptables -t nat -A POSTROUTING -s 172.16.1.7 -j SNAT --to-source 10.0.0.61 \n[root@m01 ~]# echo 'net.ipv4.ip_forward = 1' >> \/etc\/sysctl.conf\n[root@m01 ~]#  sysctl -p\nnet.ipv4.icmp_echo_ignore_all = 1\nnet.ipv4.ip_forward = 1\n<\/code><\/pre>\n\n\n\n
##web\u7aef\u914d\u7f6e<\/p>\n\n\n\n
[root@web01 ~]# echo GATEWAY=172.16.1.61 >> \/etc\/sysconfig\/network-scripts\/ifcfg-eth1\n[root@web01 ~]# ifdown eth1 && ifup eth1<\/code><\/pre>\n\n\n\n
4.2 \u5b9e\u73b0\u7aef\u53e3\u8f6c\u53d1<\/h3>\n\n\n\n
##\u9632\u706b\u5899\u914d\u7f6e<\/p>\n\n\n\n
[root@mb01 ~]# iptables -t nat -I PREROUTING -d 10.0.0.61 -p tcp --dport 9000 -j DNAT --to-destination 172.16.1.7:22\n[root@mb01 ~]# sysctl -p\nnet.ipv4.icmp_echo_ignore_all = 1\nnet.ipv4.ip_forward = 1\n###\u7136\u540e\u7528xshell\u8fde\u63a5\u6d4b\u8bd5\u4e00\u4e0b\u5427<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u5b59\u5bcc\u9633\uff0c \u6c5f\u6e56\u4eba\u79f0\u6ca1\u4eba\u79f0\u3002\u591a\u5e74\u4e92\u8054\u7f51\u8fd0\u7ef4\u5de5\u4f5c\u7ecf\u9a8c\uff0c\u66fe\u8d1f\u8d23\u8fc7\u5b59\u5e03\u65af\u5927\u89c4\u6a21\u96c6\u7fa4\u67b6\u6784\u81ea\u52a8\u5316\u8fd0\u7ef4\u7ba1\u7406\u5de5\u4f5c\u3002\u64c5\u957fWeb\u96c6 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"_links":{"self":[{"href":"https:\/\/www.buyao007.icu\/index.php?rest_route=\/wp\/v2\/posts\/222"}],"collection":[{"href":"https:\/\/www.buyao007.icu\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.buyao007.icu\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.buyao007.icu\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.buyao007.icu\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=222"}],"version-history":[{"count":0,"href":"https:\/\/www.buyao007.icu\/index.php?rest_route=\/wp\/v2\/posts\/222\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.buyao007.icu\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=222"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.buyao007.icu\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=222"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.buyao007.icu\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=222"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}