{"id":4133,"date":"2014-05-05T12:36:57","date_gmt":"2014-05-05T03:36:57","guid":{"rendered":"http:\/\/www.vincentina.net\/?p=4133"},"modified":"2020-02-23T16:29:20","modified_gmt":"2020-02-23T07:29:20","slug":"%e3%83%9e%e3%83%ab%e3%83%81%e3%81%aa%e3%82%ad%e3%83%a3%e3%82%b9%e3%83%88","status":"publish","type":"post","link":"https:\/\/www.vincentina.net\/?p=4133","title":{"rendered":"\u30de\u30eb\u30c1\u306a\u30ad\u30e3\u30b9\u30c8"},"content":{"rendered":"

\u30de\u30eb\u30c1\u30ca\u3068\u8a00\u3048\u3070\u30d2\u30f3\u30ae\u30b9\u304b\u306a\u3041\u3068\u601d\u3063\u3066\u305f\u304c\u3001\u30de\u30eb\u30c1\u30ca\u5cf6\u6d25\u3068\u3044\u3046\u306e\u3082\u6709\u540d\u3089\u3057\u3044\u3002
\n\u3061\u306a\u307f\u306b\u307e\u3064\u3044\u306a\u3002\u306b\u3057\u305f\u3089\u3001\u677e\u4e95\u306a\u307b\u306b\u3083\u3089\u3089\u3063\u3066\u3044\u3046\u306e\u3092\u671f\u5f85\u3057\u3066\u3044\u305f\u3093\u3060\u3051\u3069\u3001\u677e\u4e95\u83dc\u685c\u5b50\u3068\u3044\u3046\u65b9\u304c\u3067\u3066\u304d\u305f\u3002<\/span><\/p>\n

\u3068\u3044\u3046\u4e8b\u3067\u3001\u30d6\u30ed\u30fc\u30c9\u306a\u30ad\u30e3\u30b9\u30c8\u306b\u7d9a\u3044\u3066\u4eca\u56de\u306f\u30de\u30eb\u30c1\u306a\u30ad\u30e3\u30b9\u30c8\u3067\u3059\u3002<\/p>\n

\u53cc\u65b9\u306e\u9055\u3044\u3068\u3044\u3046\u3068\u3001\u30d6\u30ed\u30fc\u30c9\u3068\u30de\u30eb\u30c1\u3068\u3082\u30aa\u30fc\u30eb\u30ec\u30f3\u30b8\u653b\u6483\u3067\u3059\u304c\u3001\u30de\u30eb\u30c1\u306f\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u8981\u6c42\u3059\u308b\u30db\u30b9\u30c8\u304c\u5b58\u5728\u3059\u308b\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u3060\u3051\u30c7\u30fc\u30bf\u3092\u30b3\u30d4\u30fc<\/span>\u3067\u304d\u307e\u3059\u3002\u3068\u3044\u3046\u3053\u3068\u3089\u3057\u3044\u3002
\n\u30db\u30b9\u30c8\u306b<\/span>\u3058\u3083\u306a\u304f\u3066\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b<\/span>\u3063\u3066\u3068\u3053\u306f\u5927\u4e8b\u3060\u306a\u3002<\/p>\n

\u305d\u3093\u306a\u30de\u30eb\u30c1\u3067\u3059\u304c\u30eb\u30fc\u30bf\u30fc\u3092\u8d85\u3048\u308b\u306e\u3067TTL\u306e\u8a2d\u5b9a\u304c\u3067\u304d\u307e\u3059\u3002\u3066\u306a\u308f\u3051\u3067\u304b\u3064\u3066\u306f\u3053\u3093\u306a\u8106\u5f31\u306a\u3082\u306e\u3082\u3042\u3063\u305f\u3088\u3046\u3060\u3002<\/p>\n

TTL \u306e\u8a2d\u5b9a\u304c 0 \u306e\u30de\u30eb\u30c1\u30ad\u30e3\u30b9\u30c8\u304c\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3067\u9001\u4fe1\u3055\u308c\u308b<\/a><\/p>\n

Win2000\u306e\u8a71\u3067\u3059\u304c\u306d\u3002<\/p>\n

\n

\u3064\u30fc\u3053\u3068\u3067\u3001\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u306b\u7d9a\u3044\u3066\u30de\u30eb\u30c1\u30ad\u30e3\u30b9\u30c8\u3067\u3082TCP\/IP Socket in C\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u5b9f\u9a13\u3057\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n

\u5de6\u4e0a\u304c\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u53d7\u3051\u308b\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3001\u53f3\u4e0a\u304c\u3042\u306a\u305f\u306f\u305d\u3053\u306b\u3044\u307e\u3059\u304b\u3068\u3044\u3046\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u30de\u30eb\u30c1\u30ad\u30e3\u30b9\u30c8\u3059\u308b\u30b5\u30fc\u30d0\u30fc\u3001\u4e0b\u5074\u306e\u30db\u30b9\u30c8\u304c\u540c\u3058\u30bb\u30b0\u30e1\u30f3\u30c8\u306b\u3042\u3063\u3066ConntrackTool\u3067\u5f85\u3061\u69cb\u3048\u3066\u3044\u308b\u72b6\u614b\u3067\u3059\u3002<\/p>\n

\"multi01\"<\/a><\/p>\n

\u540c\u3058\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306a\u3093\u3067\u3059\u304c\u3001\u30de\u30eb\u30c1\u30ad\u30e3\u30b9\u30c8\u306f\u53d7\u4fe1\u3057\u3066\u306a\u3044\u3067\u3059\u306d\u3002<\/p>\n

\u3061\u3087\u3063\u3068\u4e0d\u5b89\u306b\u306a\u3063\u305f\u306e\u3067Tcpdump\u3067\u3082\u3084\u3063\u3066\u307f\u307e\u3057\u305f\u304c\u3001\u30de\u30eb\u30c1\u30ad\u30e3\u30b9\u30c8\u306f\u304d\u307e\u305b\u3093\u3067\u3057\u305f\u3002\u304d\u307e\u305b\u3093\u3067\u3057\u305f\u3002\u304d\u307e\u305b\u3093\u3067\u3057\u305f\u3002\u304d\u307e\u305b\u3093\u3067\u3057\u305f\u30fc\u3002<\/p>\n

22:34:36.290605 IP 192.168.24.63.45425 > 255.255.255.255.21110: UDP, length 4\r\n22:34:39.292252 IP 192.168.24.63.45425 > 255.255.255.255.21110: UDP, length 4\r\n22:34:42.293245 IP 192.168.24.63.45425 > 255.255.255.255.21110: UDP, length 4\r\n22:34:45.293850 IP 192.168.24.63.45425 > 255.255.255.255.21110: UDP, length 4<\/pre>\n
\u30db\u30b9\u30c8\u304c\u5b58\u5728\u3059\u308b\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u30b3\u30d4\u30fc\u3092\u9001\u308b\u306f\u305a\u306a\u306e\u3067\u3001\u306a\u304a\u304b\u3064Tcpdump\u306f\u30ec\u30a4\u30e4\u30fc\uff12\u307e\u3067\u78ba\u8a8d\u3067\u304d\u308b\u306e\u3067\u3063\u3066\u3055\u3063\u304d\u8abf\u3079\u305f\u306e\u3067\u3001\u8868\u793a\u3055\u308c\u308b\u306f\u305a\u3060\u3068\u601d\u3046\u306e\u3060\u304c\u304a\u304b\u3057\u3044\u306e\u3067\u3002<\/p>\n
\u306a\u305c\uff1f<\/p>\n
\u7b54\u3048\u306ftcpdump\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u304c\u9055\u3046\uff01<\/span><\/p>\n
[root@scientific ~]# tcpdump -i eth0 -n ip multicast\r\ntcpdump: verbose output suppressed, use -v or -vv for full protocol decode\r\nlistening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes\r\n22:41:32.338341 IP 192.168.24.61.60727 > 224.3.2.1.9433: UDP, length 33\r\n22:41:35.339300 IP 192.168.24.61.60727 > 224.3.2.1.9433: UDP, length 33\r\n22:41:38.340661 IP 192.168.24.61.60727 > 224.3.2.1.9433: UDP, length 33\r\n22:41:41.341806 IP 192.168.24.61.60727 > 224.3.2.1.9433: UDP, length 33<\/pre>\n
\u826f\u304b\u3063\u305f\u3001dump\u3067\u304d\u3066\u307e\u3057\u305f\u3002
\n\u3053\u306a\u3044\u306f\u305a\u304c\u306a\u3044\u3068\u601d\u3063\u305f\u306e\u3067\u3001\u826f\u304b\u3063\u305f\u3002\u9593\u9055\u3063\u3066\u306a\u304b\u3063\u305f\u3002<\/p>\n
\u305d\u3053\u307e\u3067\u306f\u3084\u3089\u306a\u3044\u3051\u3069\u3001\u5e73\u6587\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u306a\u306e\u3067\u3001tcpdump\u3067\u30d1\u30b1\u30c3\u30c8\u3092\u8aad\u3081\u3070\u3042\u306a\u305f\u306f\u305d\u3053\u306b\u3044\u307e\u3059\u304b<\/span>\u3063\u3066\u30e1\u30c3\u30bb\u30fc\u30b8\u3082\u51fa\u3066\u304f\u308b\u306f\u305a\u3060\u3002<\/p>\n
\n
\n
        
Tweet<\/a><\/div><\/div>\n
\n","protected":false},"excerpt":{"rendered":"
\u30de\u30eb\u30c1\u30ca\u3068\u8a00\u3048\u3070\u30d2\u30f3\u30ae\u30b9\u304b\u306a\u3041\u3068\u601d\u3063\u3066\u305f\u304c\u3001\u30de\u30eb\u30c1\u30ca\u5cf6\u6d25\u3068\u3044\u3046\u306e\u3082\u6709\u540d\u3089\u3057\u3044\u3002 \u3061\u306a\u307f\u306b\u307e\u3064\u3044\u306a\u3002\u306b\u3057\u305f\u3089\u3001\u677e\u4e95\u306a\u307b\u306b\u3083\u3089\u3089\u3063\u3066\u3044\u3046\u306e\u3092\u671f\u5f85\u3057\u3066\u3044\u305f\u3093\u3060\u3051\u3069\u3001\u677e\u4e95\u83dc\u685c\u5b50\u3068\u3044\u3046\u65b9\u304c\u3067\u3066\u304d\u305f\u3002 \u3068\u3044\u3046\u4e8b\u3067\u3001\u30d6\u30ed\u30fc\u30c9\u306a\u30ad\u30e3\u30b9\u30c8 … “\u30de\u30eb\u30c1\u306a\u30ad\u30e3\u30b9\u30c8” \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":[71],"tags":[],"class_list":["post-4133","post","type-post","status-publish","format-standard","hentry","category-network"],"_links":{"self":[{"href":"https:\/\/www.vincentina.net\/index.php?rest_route=\/wp\/v2\/posts\/4133","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=4133"}],"version-history":[{"count":0,"href":"https:\/\/www.vincentina.net\/index.php?rest_route=\/wp\/v2\/posts\/4133\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vincentina.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4133"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vincentina.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4133"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vincentina.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4133"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}