{"topic":{"id":3976,"title":"跨运营商通信为什么很多时候无法建立连接","slug":"topic","userId":651,"categoryId":4,"createdAt":"2023-07-11 15:25:52.762717","bumpedAt":"2023-07-12 00:41:31.189154","views":256,"postsCount":3,"highestPostNumber":4,"likeCount":0,"closed":false,"pinned":false,"pinnedGlobally":false,"pinnedAt":null,"pinnedUntil":null,"isBanner":false,"excerpt":"小运营商之间相互通信，例如说两个人用微信聊天，发送方用的是长城宽带，接收方用的是珠江宽带，这时候很容易 ping 不通，这是为什么？与 BGP 协议有关吗？","deletedAt":null,"isAnonymous":false,"isPrivate":false,"isMembersOnly":false,"category":{"id":4,"name":"谈笑风生","slug":"general","color":"25AAE2"},"author":{"id":651,"username":"tiemuhua","name":"铁暮华","avatarUrl":"/uploads/image/b8/d4/b8d4396fb15623ec6d72419b0715538e80e31348c5b0655d7eea567262e990d4.avif"},"realAuthor":{"id":651,"username":"tiemuhua","name":"铁暮华","avatarUrl":"/uploads/image/b8/d4/b8d4396fb15623ec6d72419b0715538e80e31348c5b0655d7eea567262e990d4.avif"},"tags":["bgp协议"]},"posts":[{"id":6613,"postNumber":1,"raw":"小运营商之间相互通信，例如说两个人用微信聊天，发送方用的是长城宽带，接收方用的是珠江宽带，这时候很容易 ping 不通，这是为什么？与 BGP 协议有关吗？","cooked":"

小运营商之间相互通信，例如说两个人用微信聊天，发送方用的是长城宽带，接收方用的是珠江宽带，这时候很容易 ping 不通，这是为什么？与 BGP 协议有关吗？

\n","createdAt":"2023-07-11 15:25:52.954143","updatedAt":"2023-07-11 15:26:21.075744","replyToPostNumber":null,"replyCount":0,"likeCount":0,"wordCount":69,"liked":false,"bookmarked":false,"polls":[],"reactions":[],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":651,"username":"tiemuhua","name":"铁暮华","avatarUrl":"/uploads/image/b8/d4/b8d4396fb15623ec6d72419b0715538e80e31348c5b0655d7eea567262e990d4.avif","admin":false,"moderator":false,"signatureRaw":null,"signatureCooked":null}},{"id":6649,"postNumber":3,"raw":"跟 Border Gateway Protocol 没有关系。一般 ping 指的是 ICMP ping，都是用 firewall ACL 过滤掉的，可以用`traceroute / tracepath / mtr` (Win 里用 `tracert`) 看看断在哪一个中间主机。还有，你 ping 的是对方公网 IP，而 ISP 又不会给你公网 IPv4，都是 NAT，你的内网 host 被映射到公网上的某些端口向外发数据。\n\n@AIBot BGP 协议是什么，有什么用？NAT 又是什么？","cooked":"

跟 Border Gateway Protocol 没有关系。一般 ping 指的是 ICMP ping，都是用 firewall ACL 过滤掉的，可以用traceroute / tracepath / mtr (Win 里用 tracert) 看看断在哪一个中间主机。还有，你 ping 的是对方公网 IP，而 ISP 又不会给你公网 IPv4，都是 NAT，你的内网 host 被映射到公网上的某些端口向外发数据。

@AIBot BGP 协议是什么，有什么用？NAT 又是什么？

\n","createdAt":"2023-07-12 00:41:23.701669","updatedAt":"2024-03-17 13:04:53.834411","replyToPostNumber":null,"replyCount":1,"likeCount":0,"wordCount":117,"liked":false,"bookmarked":false,"polls":[],"reactions":[],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":1047,"username":"anonymous_coward_old","name":"Anonymous Coward Old","avatarUrl":"/uploads/image/43/32/4332638c11248b8ff07033c11de0759a55205facfbec85e14458245a91991faf.avif","admin":false,"moderator":false,"signatureRaw":null,"signatureCooked":null}},{"id":6650,"postNumber":4,"raw":"BGP 协议（边界网关协议）是一个互联网的路由协议，用于在不同的自治系统之间交换网络间路由信息。它的主要功能是实现 AS 之间的互通。\n\nNAT（网络地址转换）是一种将一个网络的 IP 地址转换成另一个网络的 IP 地址的技术，通常用于将本地网络连接到公网上。NAT 经常被用来防止攻击，同时也可以节省 IP 地址的使用。但是，NAT 也可能影响到一些网络应用程序的正常运行。","cooked":"

BGP 协议（边界网关协议）是一个互联网的路由协议，用于在不同的自治系统之间交换网络间路由信息。它的主要功能是实现 AS 之间的互通。

NAT（网络地址转换）是一种将一个网络的 IP 地址转换成另一个网络的 IP 地址的技术，通常用于将本地网络连接到公网上。NAT 经常被用来防止攻击，同时也可以节省 IP 地址的使用。但是，NAT 也可能影响到一些网络应用程序的正常运行。

\n","createdAt":"2023-07-12 00:41:31.189154","updatedAt":"2023-07-12 00:41:31.189154","replyToPostNumber":3,"replyCount":0,"likeCount":0,"wordCount":160,"liked":false,"bookmarked":false,"polls":[],"reactions":[],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":-4,"username":"aibot_old","name":"小AI同學","avatarUrl":"/uploads/image/02/1b/021bb0b0848388a911ae795dde7c8e5b3f1962316b2d88853208172cd0e89de2.avif","admin":false,"moderator":false,"signatureRaw":null,"signatureCooked":null}}],"hasMore":false,"lastReadPostNumber":1,"hasUrlPostNumber":false}