重传场景的复杂性,在 TCP 分析中对于TCP Spurious Retransmission是与TCP Out-Of-Order、TCP Fast Retransmission、TCP Retransmission等在一起判断标记乱序或重传类型,而在不少场景还会有判断出错的问题,当然 Wireshark 考虑到这种情况,也有手动修正的选项,这正好也侧面证明了上面的说法,关于 TCP 乱序、重传的复杂性。
但本案例既然说是虚假的 [TCP Spurious Retransmission],那么就意味着说是 Wireshark 判断错误。 问题信息 数据包跟踪文件基本信息如下: λ capinfos SR.pcapng File name: SR.pcapng File type: Wireshark/... - pcapng File encapsulation: Ethernet File timestamp precision: nanoseconds (9) Packet size limit...
tcp 抓包出现spurious retransmission 一、tcp虚假重传 指实际上并没有超时,但看起来超时了,导致虚假超时重传的原因有很多种: (1)对于部分移动网络,当网络发生切换时会导致网络延时突增 (2)当网络的可用带宽突然变小时,网络rtt会出现突增的情况,这会导致虚假超时重传 (3)网络丢包(原始和重传的包都有可能丢包)会导...
tcp 抓包出现spurious retransmission 技术标签:抓包工具 一、tcp虚假重传 指实际上并没有超时,但看起来超时了,导致虚假超时重传的原因有很多种: (1)对于部分移动网络,当网络发生切换时会导致网络延时突增 (2)当网络的可用带宽突然变小时,网络rtt会出现突增的情况,这会导致虚假超时重传 (3)网络丢包(原始和重传的...
RTO(Retransmission Timeout)操作系统默认如下: Linux的超时重传默认是3秒,这就意味这,一旦发生丢包,用户的体验将会很不好,因此可以采用强制快速重传技术来进行提速(Spurious SYN/SYN-ACK retransmissions),将超时重传时间强制设定为1秒。但这可能会导致duplicate packets,可以通过修改TS(tcp_sack参数,链路质量良好的情况...
tcp spurious retransmission(tcp伪重传) 1)Packet size limited during capture 说明被标记的那个包没有抓全。一般是由抓包方式引起,有些操作系统中默认只抓每个帧的前96个字节。 4号包全长171字节,但只有96字节被抓到。 2)TCP Previous segment not captured ...
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Basically “Spurious Retransmission” means that data wassent againthat the receiver hadalready acknowledged, which is something that we used to call “needless retransmission” in our own expert system. “Needless” probably doesn’t sound technically weird enough, so in papers about those retransmiss...
Notice in our network diagram, we captured at the client. If the ACK didn't make it to the server, this isn't really a Spurious Retransmission - it's just a standard Retransmission. Wireshark must mark it as a Spurious Retransmission because the ACK was seen in the trace file. ...
2334 process_one_work+0x8d3/0x1200 kernel/workqueue.c:2272 worker_thread+0x9c/0x1090 kernel/workqueue.c:2418 kthread+0x303/0x410 kernel/kthread.c:292 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:296 The mptcp_worker tries to update the MPTCP retransmission timer even if such ...