{"id":207407,"date":"2025-07-08T09:37:02","date_gmt":"2025-07-08T01:37:02","guid":{"rendered":"https:\/\/server.hk\/cnblog\/207407\/"},"modified":"2025-07-08T09:37:02","modified_gmt":"2025-07-08T01:37:02","slug":"%e8%ae%be%e7%bd%ae-ipv4-packetconn-%e6%93%8d%e4%bd%9c%e7%b3%bb%e7%bb%9f%e6%8e%a5%e6%94%b6%e7%bc%93%e5%86%b2%e5%8c%ba%e7%9a%84%e5%a4%a7%e5%b0%8f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/207407\/","title":{"rendered":"\u8bbe\u7f6e ipv4.PacketConn \u64cd\u4f5c\u7cfb\u7edf\u63a5\u6536\u7f13\u51b2\u533a\u7684\u5927\u5c0f"},"content":{"rendered":"<p><b><\/b> <\/p>\n<p>\u5f53\u524d\u4f4d\u7f6e\uff1a <span>&gt;<\/span> <span>&gt;<\/span> <span>&gt;<\/span> <span>&gt;<\/span> <span>\u8bbe\u7f6e ipv4.PacketConn \u64cd\u4f5c\u7cfb\u7edf\u63a5\u6536\u7f13\u51b2\u533a\u7684\u5927\u5c0f<\/span><\/p>\n<p><span>\u6765\u6e90\uff1astackoverflow<\/span><br \/>\n<span>2024-04-22 12:48:37<\/span><br \/>\n<span><i><\/i>0\u6d4f\u89c8<\/span><br \/>\n<span style=\"cursor: pointer\"><i><\/i>\u6536\u85cf<\/span> <\/p>\n<p>\u672c\u7bc7\u6587\u7ae0\u7ed9\u5927\u5bb6\u5206\u4eab\u300a\u8bbe\u7f6e ipv4.PacketConn \u64cd\u4f5c\u7cfb\u7edf\u63a5\u6536\u7f13\u51b2\u533a\u7684\u5927\u5c0f\u300b\uff0c\u8986\u76d6\u4e86Golang\u7684\u5e38\u89c1\u57fa\u7840\u77e5\u8bc6\uff0c\u5176\u5b9e\u4e00\u4e2a\u8bed\u8a00\u7684\u5168\u90e8\u77e5\u8bc6\u70b9\u4e00\u7bc7\u6587\u7ae0\u662f\u4e0d\u53ef\u80fd\u8bf4\u5b8c\u7684\uff0c\u4f46\u5e0c\u671b\u901a\u8fc7\u8fd9\u4e9b\u95ee\u9898\uff0c\u8ba9\u8bfb\u8005\u5bf9\u81ea\u5df1\u7684\u638c\u63e1\u7a0b\u5ea6\u6709\u4e00\u5b9a\u7684\u8ba4\u8bc6(B \u6570)\uff0c\u4ece\u800c\u5f25\u8865\u81ea\u5df1\u7684\u4e0d\u8db3\uff0c\u66f4\u597d\u7684\u638c\u63e1\u5b83\u3002<\/p>\n<p> \u95ee\u9898\u5185\u5bb9<br \/>\n <\/p>\n<p>\u6211\u66fe\u7ecf\u4f7f\u7528 <code>net.UDPConn<\/code> \u8bfb\u53d6\u548c\u5199\u5165 <code>UDP<\/code> \u6d88\u606f\uff0c\u5176\u4e2d\u6211\u53ef\u4ee5\u4f7f\u7528 <code>SetReadBuffer<\/code> \u6765\u66f4\u6539\u64cd\u4f5c\u7cfb\u7edf\u7684\u63a5\u6536\u7f13\u51b2\u533a\u5927\u5c0f\u3002<\/p>\n<p>\u7531\u4e8e\u6211\u9700\u8981\u80fd\u591f\u5728\u5e94\u7528\u7a0b\u5e8f\u53d1\u9001\u7684 <code>UDP<\/code> \u6570\u636e\u5305\u4e0a\u8bbe\u7f6e <code>TTL<\/code>\uff0c\u56e0\u6b64\u6211\u5c06\u79fb\u52a8\u5230 <code>ipv4<\/code> \u5305\uff0c\u5728\u8be5\u5305\u4e2d\u6211\u53ef\u4ee5\u5bf9 IP \u5957\u63a5\u5b57\u8fdb\u884c\u66f4\u4f4e\u7ea7\u522b\u7684\u8bbf\u95ee\uff0c\u5e76\u4e14\u53ef\u4ee5\u4e3a\u4f20\u51fa\u6d88\u606f\u8bbe\u7f6e <code>TTL<\/code>\u3002<\/p>\n<p>\u4f46\u6211\u4e0d\u77e5\u9053\u5982\u4f55\u66f4\u6539 <code>ipv4.PacketConn<\/code> \u4e0a\u7684\u8bfb\u53d6\u7f13\u51b2\u533a\u5927\u5c0f\u3002<\/p>\n<p><code>SetReadBuffer<\/code> \u7684\u5b9e\u73b0\u4f7f\u7528\u8fde\u63a5\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u8bbe\u7f6e\u7f13\u51b2\u533a\uff0c\u8fd9\u53ef\u80fd\u4e0e <code>ipv4.PacketConn<\/code> \u7c7b\u4f3c\u5417\uff1f<\/p>\n<p> <\/p>\n<h2>\u89e3\u51b3\u65b9\u6848<\/h2>\n<p> <\/p>\n<p>\u8fd9\u662f\u5728 golang 1.11 \u53ca\u66f4\u9ad8\u7248\u672c\u7684 unix \u5e73\u53f0\u4e0a\u6267\u884c\u6b64\u64cd\u4f5c\u7684\u65b9\u6cd5\uff1a<\/p>\n<pre>package main\n\nimport (\n    \"context\"\n    \"fmt\"\n    \"net\"\n    \"syscall\"\n    \"golang.org\/x\/sys\/unix\"\n)\n\nfunc control(network, address string, c syscall.RawConn) error {\n    c.Control(func(fd uintptr) {\n        if err := unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_RCVBUF, 1024*1024); err != nil {\n            fmt.Printf(\"Set socket receive buffer size failed: %v\\n\", err)\n        }\n        fmt.Printf(\"Set socket receive buffer size\\n\")\n    })\n    return nil\n}\n\n\nfunc main() {\n    lc := net.ListenConfig{Control: control}\n    if _, err := lc.ListenPacket(context.Background(), \"udp\", \"127.0.0.1:9999\"); err != nil {\n        fmt.Printf(\"ListenPacket failed: %v\\n\", err)\n    }\n}\n<\/pre>\n<p>\u3002<\/p>\n<p>\u672c\u7bc7\u5173\u4e8e\u300a\u8bbe\u7f6e ipv4.PacketConn \u64cd\u4f5c\u7cfb\u7edf\u63a5\u6536\u7f13\u51b2\u533a\u7684\u5927\u5c0f\u300b\u7684\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\u5566\uff0c\u4f46\u662f\u5b66\u65e0\u6b62\u5883\uff0c\u60f3\u8981\u4e86\u89e3\u5b66\u4e60\u66f4\u591a\u5173\u4e8eGolang\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5f53\u524d\u4f4d\u7f6e\uff1a &gt; &gt; &#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-207407","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207407","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=207407"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207407\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=207407"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=207407"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=207407"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}