{"id":3947,"date":"2014-02-16T11:47:01","date_gmt":"2014-02-16T02:47:01","guid":{"rendered":"http:\/\/www.vincentina.net\/?p=3947"},"modified":"2025-02-25T21:23:11","modified_gmt":"2025-02-25T12:23:11","slug":"ntp%e3%81%ae%e8%84%86%e5%bc%b1%e6%80%a7%e3%81%ab%e3%81%a4%e3%81%84%e3%81%a6%e3%81%ae%e3%81%8a%e7%9f%a5%e3%82%89%e3%81%9b%e3%81%8c%e6%9d%a5%e3%81%9f","status":"publish","type":"post","link":"https:\/\/www.vincentina.net\/?p=3947","title":{"rendered":"NTP\u306e\u8106\u5f31\u6027\u306b\u3064\u3044\u3066\u306e\u304a\u77e5\u3089\u305b\u304c\u6765\u305f"},"content":{"rendered":"

\u8abf\u3079\u3066\u307f\u305f\u3068\u3053\u308d\u3001\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u653b\u6483<\/span>\u3068\u3044\u3046\u3082\u306e\u3089\u3057\u3044\u3067\u3059\u3002<\/p>\n

\u5206\u304b\u308a\u3084\u3059\u304f\u7c21\u5358\u306b\u8aac\u660e\u3059\u308b\u3068<\/p>\n

\u25cf\u25cf\u3055\u3093\u304c\u3001ntp\u30b5\u30fc\u30d0\u30fc\u306b\u5bfe\u3057\u3066\u300c\u79c1\u306f\u25b2\u25b2\u3060\u304c\u3001\u3061\u3087\u3063\u3068\u6559\u3048\u3066\u304f\u308c\u306a\u3044\u304b\uff1f\u300d\u3068\u5c0b\u306d\u308b\u3068\u3001ntp\u30b5\u30fc\u30d0\u30fc\u306f\u25b2\u25b2\u306b\u5bfe\u3057\u3066\u8fd4\u4e8b\u3057\u307e\u3059\u3002<\/span><\/p>\n

\u305d\u3093\u306a\u611f\u3058\u3089\u3057\u3044\u3001\u591a\u5206\u306d\u3002\u3044\u308f\u3086\u308b\u3002<\/p>\n

\u304a\u308c\u304a\u308c\u8a50\u6b3a<\/span>\u307f\u305f\u3044\u306a\u3082\u306e\u304b\u3002<\/p>\n

 <\/p>\n

\u8a71\u3092\u623b\u3057\u3066\u3001Scientific\u3068CentOS\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u8a2d\u5b9a\u3067\u306f<\/p>\n

restrict default kod nomodify notrap nopeer noquery\r\nrestrict -6 default kod nomodify notrap nopeer noquery\r\n\r\n\u3082\u3057\u304f\u306f\r\n\r\nrestrict default ignore\r\nrestrict -6 default ignore<\/pre>\n
\u3059\u3079\u3066\u62d2\u5426\u304b\u7121\u8996\u3057\u3066\u30ed\u30fc\u30ab\u30eb\u3060\u3051\u53d7\u3051\u5165\u308c\u308b\u8a2d\u5b9a\u3067\u3001ntp\u3092\u5165\u308c\u305f\u76f4\u5f8c\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u3053\u3046\u306a\u3063\u3066\u3044\u307e\u3057\u305f\u3002\u53e4\u3044\u30d0\u30fc\u30b8\u30e7\u30f3\u306e\u3082\u306e\u306f\u5206\u304b\u308a\u307e\u305b\u3093\u3002<\/p>\n
\u3053\u306e\u72b6\u614b\u3067monlist\u3092\u9001\u3063\u3066\u307f\u307e\u3059\u3068\u3002<\/p>\n
# ntpdc -c monlist 192.168.17.129\r\n192.168.17.129: timed out, nothing received\r\n***Request timed out\r\n\r\n# telnet 192.168.17.129 123\r\nTrying 192.168.17.129...\r\ntelnet: connect to address 192.168.17.129: Connection refused<\/pre>\n
\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u3057\u307e\u3059\u3002\u3093\u3067\u3082\u3057\u3082iptables\u304c\u52d5\u3044\u3066\u305f\u3089\u3053\u3046\u306a\u308a\u307e\u3059\u3002<\/p>\n
# ntpdc -c monlist 192.168.17.129\r\nntpdc: read: No route to host\r\n\r\n# telnet 192.168.17.129 123\r\nTrying 192.168.17.129...\r\ntelnet: connect to address 192.168.17.129: No route to host<\/pre>\n
\u3067\u306f\u3067\u306f\u3001iptables\u304c\u52d5\u3044\u3066\u304a\u3089\u305a\u3001ntp.conf\u3082\u30c7\u30d5\u30a9\u30eb\u30c8\u304b\u3089\u5909\u66f4\u3057\u3066\u53d7\u3051\u5165\u308c\u308b\u8a2d\u5b9a\u306b\u5909\u3048\u305f\u5834\u5408\u3067\u306f\u3053\u3046\u306a\u308a\u307e\u3059\u3002<\/p>\n
# ntpdc -c monlist 192.168.17.129\r\nremote address\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 port local address\u00a0\u00a0\u00a0\u00a0\u00a0 count m ver rstr avgint\u00a0 lstint\r\n===============================================================================\r\n\uff0a\uff0a\uff0a\uff0a\uff0a\uff0a\uff0a \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 123 192.168.17.129\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1 4 4\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\r\n\uff0a\uff0a\uff0a\uff0a\uff0a\uff0a\uff0a\uff0a\uff0a\uff0a \u00a0 123 192.168.17.129\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1 4 4\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a0 1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1<\/pre>\n
\u3075\u3064\u3046\u306b\u5024\u3092\u8fd4\u3057\u307e\u3059\u306a\u3002
\n\u305f\u3060\u3053\u3053\u307e\u3067\u306f\u3042\u304f\u307e\u3067\u666e\u901a<\/span>\u306e\u8a71\u3067\u3057\u3066\u30012\u9032\u6570\u306e\u4e16\u754c\u3067\u306f\u3084\u308d\u3046\u3068\u3059\u308b\u306a\u3067\u304d\u308b\u3068\u77e5\u308c<\/span>\u3063\u3066\u306e\u304c\u666e\u901a<\/span>\u3089\u3057\u3044\u3067\u3059\u3057\u3002
\n\u306a\u306b\u304c\u3042\u308b\u304b\u4e88\u6e2c\u304c\u3064\u304b\u306a\u3044\u306e\u3067\u3001monlist\u7121\u52b9\u306b\u3057\u3066\u308b\u306e\u304c\u3044\u3044\u3068\u601d\u3046\u3002<\/p>\n
 <\/p>\n
\u304a\u308c\u304a\u308c\u8a50\u6b3a\u304c\u306a\u305c\u3067\u304d\u308b\u304b\u3068\u306a\u308b\u3068\u3001UDP\u306a\u306e\u3067IP\u507d\u88c5\u304c\u3067\u304d\u308b\u3088\u3046\u3067\u3059\u3002
\n\u8a71\u306f\u9038\u308c\u308b\u3051\u3069\u3001TCP\u3067\u3082\u30cf\u30fc\u30d5\u30af\u30ed\u30fc\u30ba\u306a\u3089IP\u507d\u88c5\u53ef\u80fd\u3089\u3057\u3044\u3067\u30fc\u3063\u3066\u3053\u3068\u3067\u3001\u305d\u308c\u3067syn_flood\u3068\u3044\u3046\u653b\u6483\u3068\u3044\u3046\u306e\u3082\u5b58\u5728\u3057\u3066\u3044\u308b\u3002
\n\u4ee5\u524dconntrack-tool\u3092\u4f7f\u3063\u3066\u5b9f\u9a13\u3092\u3084\u3063\u305f\u304c Established\uff1d\uff1eDestroy \u3068\u306a\u3063\u3066\u3057\u307e\u3063\u3066\u3046\u307e\u304f\u3044\u304b\u306a\u304b\u3063\u305f\u306e\u3060\u3051\u3069\u3001\u3044\u304f\u3089\u5927\u91cf\u306eTCP\u306e\u901a\u4fe1\u3092\u666e\u901a\u306b\u3084\u3063\u3066\u3082\u3046\u307e\u304f\u3044\u304b\u306a\u3044\u8a33\u3060\u3002<\/p>\n
\u306a\u306b\u308f\u3068\u3082\u3042\u308c\u3001monlist\u3092\u7121\u52b9\u306b\u3059\u308b\u306e\u304c\u3088\u3044\u305e\u3068\u3002<\/p>\n
vim \/etc\/ntp.conf\r\ndisable monitor \/\/\u3069\u3053\u3067\u3082OK<\/pre>\n
monlist\u7121\u52b9\u306b\u3057\u305f\u30b5\u30fc\u30d0\u306b\u30c7\u30fc\u30bf\u9001\u4fe1\u3057\u3066\u307f\u308b\u3068\u3053\u3046\u306a\u308a\u307e\u3059\u3002\u30c7\u30fc\u30bf\u304c\u306a\u3044\u3088\u3002<\/p>\n
$ ntpdc -c monlist 192.168.17.129\r\n***Server reports data not found<\/span><\/pre>\n
\u5b9f\u969b\u306bIP\u507d\u88c5\u3057\u3066\u691c\u8a3c\u306f\u3057\u3066\u307e\u305b\u3093\u3002<\/p>\n
\u3064\u30443\u65e5\u524d\u306bIT\u30e1\u30c7\u30a3\u30a2\u3067<\/p>\n
400Gbps\u306eDDoS\u653b\u6483\u767a\u751f\u3001\u300cNTP\u5897\u5e45\u300d\u3067\u904e\u53bb\u6700\u5927\u898f\u6a21\u306b<\/big><\/span><\/a><\/h1>\n
\u306a\u3093\u3066\u8a18\u4e8b\u304c\u51fa\u305f\u3002400Gbps\u3063\u3066\u3044\u3063\u3066\u3082\u3044\u307e\u3044\u3061\u30d4\u30f3\u3068\u3053\u306a\u3044\u304b\u3089\u3001\u5358\u4f4d\u3092\u5909\u3048\u3066\u307f\u3088\u3046\u3002<\/p>\n
1Gbps\u306f2\u306e30\u4e57\u500d\u304b\u3089400\u500d\u3092\u3059\u308b\u3068\u3001\u306a\u3093\u30684280\u5104bps\u3089\u3057\u3044\u3002
\n\u306a\u3093\u3060\u304b\u3059\u3054\u3044\u611f\u3058\u306f\u3059\u308b\u3051\u3069\u3001\u3088\u3051\u3044\u306b\u30d4\u30f3\u3068\u6765\u306a\u304f\u306a\u3063\u3066\u3057\u307e\u3063\u305f\u306a\u3002<\/p>\n
 <\/p>\n
        
Tweet<\/a><\/div><\/div>\n
\n","protected":false},"excerpt":{"rendered":"
\u8abf\u3079\u3066\u307f\u305f\u3068\u3053\u308d\u3001\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u653b\u6483\u3068\u3044\u3046\u3082\u306e\u3089\u3057\u3044\u3067\u3059\u3002 \u5206\u304b\u308a\u3084\u3059\u304f\u7c21\u5358\u306b\u8aac\u660e\u3059\u308b\u3068 \u25cf\u25cf\u3055\u3093\u304c\u3001ntp\u30b5\u30fc\u30d0\u30fc\u306b\u5bfe\u3057\u3066\u300c\u79c1\u306f\u25b2\u25b2\u3060\u304c\u3001\u3061\u3087\u3063\u3068\u6559\u3048\u3066\u304f\u308c\u306a\u3044\u304b\uff1f\u300d\u3068\u5c0b\u306d\u308b\u3068\u3001ntp\u30b5\u30fc\u30d0\u30fc\u306f\u25b2\u25b2\u306b\u5bfe\u3057\u3066\u8fd4\u4e8b\u3057\u307e\u3059\u3002 … “NTP\u306e\u8106\u5f31\u6027\u306b\u3064\u3044\u3066\u306e\u304a\u77e5\u3089\u305b\u304c\u6765\u305f” \u306e<\/span>\u7d9a\u304d\u3092\u8aad\u3080<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[89],"tags":[],"class_list":["post-3947","post","type-post","status-publish","format-standard","hentry","category-security"],"_links":{"self":[{"href":"https:\/\/www.vincentina.net\/index.php?rest_route=\/wp\/v2\/posts\/3947","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vincentina.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vincentina.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vincentina.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vincentina.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3947"}],"version-history":[{"count":2,"href":"https:\/\/www.vincentina.net\/index.php?rest_route=\/wp\/v2\/posts\/3947\/revisions"}],"predecessor-version":[{"id":8095,"href":"https:\/\/www.vincentina.net\/index.php?rest_route=\/wp\/v2\/posts\/3947\/revisions\/8095"}],"wp:attachment":[{"href":"https:\/\/www.vincentina.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3947"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vincentina.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3947"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vincentina.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3947"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}