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码农随笔 | coding, technology, work, life

Coding, technology, work, life. FIN WAIT 2定时器(FIN WAIT 2 timer). TIME WAIT定时器 (TIME WAIT timer, 也叫 2MSL. 顾名思义,这个定时器是在建立连接的时候使用的, 我们知道, TCP建立连接需要3次握手, 如下图所示. 如果client在连接server的时候, 在发送SYN的时候, 会启动一个定时器(默认应该是3秒),如果SYN包丢失了, 那么3秒以后会重新发送SYN包的(当然还会启动一个新的定时器, 设置成6秒超时),当然也不会一直没完没了的发SYN包, 在/proc/sys/net/ipv4/tcp syn retries 可以设置到底要重新发送几次SYN包。 对于TCP发送出去的数据包, 需要等待对端发来ACK才能从内存里面删除, 那么如果对端没有发送ACK怎么办 重传呗, 在发送数据的同时,在设置一个超时时间(一般设置成2个RTT的时间),如果在这个超时时间内, 没有收到ACK,那么就重传刚才发送的数据。 FIN WAIT 2定时器(FIN WAIT 2 timer).

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码农随笔 | coding, technology, work, life | codingsky.net Reviews
<META>
DESCRIPTION
Coding, technology, work, life. FIN WAIT 2定时器(FIN WAIT 2 timer). TIME WAIT定时器 (TIME WAIT timer, 也叫 2MSL. 顾名思义,这个定时器是在建立连接的时候使用的, 我们知道, TCP建立连接需要3次握手, 如下图所示. 如果client在连接server的时候, 在发送SYN的时候, 会启动一个定时器(默认应该是3秒),如果SYN包丢失了, 那么3秒以后会重新发送SYN包的(当然还会启动一个新的定时器, 设置成6秒超时),当然也不会一直没完没了的发SYN包, 在/proc/sys/net/ipv4/tcp syn retries 可以设置到底要重新发送几次SYN包。 对于TCP发送出去的数据包, 需要等待对端发来ACK才能从内存里面删除, 那么如果对端没有发送ACK怎么办 重传呗, 在发送数据的同时,在设置一个超时时间(一般设置成2个RTT的时间),如果在这个超时时间内, 没有收到ACK,那么就重传刚才发送的数据。 FIN WAIT 2定时器(FIN WAIT 2 timer).
<META>
KEYWORDS
1 码农随笔
2 跳至内容
3 示例页面
4 tcp的7种定时器
5 发表回复
6 我们知道tcp是面向 连接
7 的, 可靠
8 的, 流式
9 传输的协议, 在tcp的里面有7种定时器, 分别是
10 建立连接定时器 connection establishment timer
CONTENT
Page content here
KEYWORDS ON
PAGE
码农随笔,跳至内容,示例页面,tcp的7种定时器,发表回复,我们知道tcp是面向 连接,的, 可靠,的, 流式,传输的协议, 在tcp的里面有7种定时器, 分别是,建立连接定时器 connection establishment timer,重传定时器 retransmission timer,延迟应答定时器 delayed ack timer,坚持定时器 persist timer,保活定时器 keepalive timer,timer,下面分别介绍一下这几种定时器,tcp的状态图如下所示,本条目发布于
SERVER
yunjiasu-nginx
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utf-8
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码农随笔 | coding, technology, work, life | codingsky.net Reviews

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Coding, technology, work, life. FIN WAIT 2定时器(FIN WAIT 2 timer). TIME WAIT定时器 (TIME WAIT timer, 也叫 2MSL. 顾名思义,这个定时器是在建立连接的时候使用的, 我们知道, TCP建立连接需要3次握手, 如下图所示. 如果client在连接server的时候, 在发送SYN的时候, 会启动一个定时器(默认应该是3秒),如果SYN包丢失了, 那么3秒以后会重新发送SYN包的(当然还会启动一个新的定时器, 设置成6秒超时),当然也不会一直没完没了的发SYN包, 在/proc/sys/net/ipv4/tcp syn retries 可以设置到底要重新发送几次SYN包。 对于TCP发送出去的数据包, 需要等待对端发来ACK才能从内存里面删除, 那么如果对端没有发送ACK怎么办 重传呗, 在发送数据的同时,在设置一个超时时间(一般设置成2个RTT的时间),如果在这个超时时间内, 没有收到ACK,那么就重传刚才发送的数据。 FIN WAIT 2定时器(FIN WAIT 2 timer).

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六月 | 2015 | 码农随笔

http://codingsky.net/2015/06

Coding, technology, work, life. FIN WAIT 2定时器(FIN WAIT 2 timer). TIME WAIT定时器 (TIME WAIT timer, 也叫 2MSL. 顾名思义,这个定时器是在建立连接的时候使用的, 我们知道, TCP建立连接需要3次握手, 如下图所示. 如果client在连接server的时候, 在发送SYN的时候, 会启动一个定时器(默认应该是3秒),如果SYN包丢失了, 那么3秒以后会重新发送SYN包的(当然还会启动一个新的定时器, 设置成6秒超时),当然也不会一直没完没了的发SYN包, 在/proc/sys/net/ipv4/tcp syn retries 可以设置到底要重新发送几次SYN包。 对于TCP发送出去的数据包, 需要等待对端发来ACK才能从内存里面删除, 那么如果对端没有发送ACK怎么办 重传呗, 在发送数据的同时,在设置一个超时时间(一般设置成2个RTT的时间),如果在这个超时时间内, 没有收到ACK,那么就重传刚才发送的数据。 FIN WAIT 2定时器(FIN WAIT 2 timer).

3

abblly | 码农随笔

http://codingsky.net/author/abblly

Coding, technology, work, life. 如果有如下语句 var m map[string]int ,. 那么变量m就是一个key为string类型, value为int类型的map,因为map是引用类型(和go里面的slice一样), 所以m的值是nil,它没有指向任何内部的map数据结构,你可以读这个m,但是写它是会panic掉的,所以你最好不要这样来声明m, 你可以用go自带的make函数. Go为你提供了你熟悉的方式来操作map, 比如 m[“route”] = 66. 读取这个key的值并赋给一个新的变量可以用 i := m[“route”]. 比如 z := m[“not-exist”]. 如果你想删除map里面的一个特定的key, 你可以用go内置的delete函数, 比如delete(m, “to-be-deleted”) 来删除可以为 “to-be-deleted”的元素。 刚才我们说过, 如果取值的时候, key不存在, 那么将返回值类型的零值, 那么假如有如下语句 a := m[“mykey”]. For , p := range likes["cheese"...

4

未分类 | 码农随笔

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Coding, technology, work, life. 早就注册了域名, 也申请了空间, 一直偷懒, 过了快半年才把想起来把站搭起来, 搭的过程才发现原来这么简单。 很多事情其实都是这样, 总是找各种理由拖延, 其实不是做起来多难, 就是自己犯懒, 这个毛病看来得改改了。

5

五月 | 2015 | 码农随笔

http://codingsky.net/2015/05

Coding, technology, work, life. 早就注册了域名, 也申请了空间, 一直偷懒, 过了快半年才把想起来把站搭起来, 搭的过程才发现原来这么简单。 很多事情其实都是这样, 总是找各种理由拖延, 其实不是做起来多难, 就是自己犯懒, 这个毛病看来得改改了。

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Coding, technology, work, life. FIN WAIT 2定时器(FIN WAIT 2 timer). TIME WAIT定时器 (TIME WAIT timer, 也叫 2MSL. 顾名思义,这个定时器是在建立连接的时候使用的, 我们知道, TCP建立连接需要3次握手, 如下图所示. 如果client在连接server的时候, 在发送SYN的时候, 会启动一个定时器(默认应该是3秒),如果SYN包丢失了, 那么3秒以后会重新发送SYN包的(当然还会启动一个新的定时器, 设置成6秒超时),当然也不会一直没完没了的发SYN包, 在/proc/sys/net/ipv4/tcp syn retries 可以设置到底要重新发送几次SYN包。 对于TCP发送出去的数据包, 需要等待对端发来ACK才能从内存里面删除, 那么如果对端没有发送ACK怎么办 重传呗, 在发送数据的同时,在设置一个超时时间(一般设置成2个RTT的时间),如果在这个超时时间内, 没有收到ACK,那么就重传刚才发送的数据。 FIN WAIT 2定时器(FIN WAIT 2 timer).

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