问题描述
请考虑存在一个服务器和多个客户端的情况.每个客户端创建TCP连接以与服务器交互. TCP活着有三种用法:
Consider a scenario where exists one server and multiple clients. And each client creates TCP connections to interact with the server. There are three usages of TCP alive:
- 服务器端keepalive:服务器发送TCP keepalive以确保客户端处于活动状态.如果客户端已死，则服务器将关闭与客户端的TCP连接.
- 客户端的保持活动状态:客户端发送TCP保持活动状态，以防止服务器关闭与客户端的TCP连接.
- 双方keepalive:服务器和客户端均按照1和2中的说明发送TCP keepalive.
以上典型的TCP keepalive用法是什么?
Which of the above usages of TCP keepalive are typical?
推荐答案
如果客户端已死，则服务器会在连接后 出现连接重置"错误.
If the client is dead, the server gets a 'connection reset' error, after which it should close the connection.
不.客户端发送keepalive，以便如果服务器已死，则客户端将收到连接重置"错误，然后应关闭连接.
No. Client sends keepalive so that if the server is dead, the client will get a 'connection reset' error, after which it should close the connection.
如上所述，由于keepalive失败，双方都能进行连接重置".
Both sides are capable of getting a 'connection reset' due to keepalive failure, as above.
其中任何一个，或者一个都没有.如果对等方定期发送消息，则也实际上不需要保持活动状态.因此，对于服务器而言，它通常比客户机更有用.
Any of them, or none. If a peer is sending regularly it doesn't really need keepalive as well. It is therefore often of more use to a server than a client.
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