英文:
what is ``differentiated service : congestion experienced``?
问题
"Explicit Congestion Notification: Congestion Experienced" 可以翻译为“显式拥塞通知：拥塞已经发生”。
英文:
I was trying to send packets and capture them using wireshark to see how they look like using scapy
sr1(IP(src='192.168.1.35', dst='192.168.1.1', tos=3)/'my packet')
when i sent the packet and captured it in wireshark i got the full ip stack but this piece of the ip stack got my attention
Differentiated Services Field: 0x03 (DSCP: CS0, ECN: CE)
0000 00.. = Differentiated Services Codepoint: Default (0)
.... ..11 = Explicit Congestion Notification: Congestion Experienced (3)]]
what is Explicit Congestion Notification: Congestion Experienced ?
答案1
得分: 1
尝试阅读 RFC 3168。
TCP/IP 是一种复杂的协议（协议的组合）。你的拥塞通知似乎是一个在你的路由器（或源目标路径）中实现的拥塞检查（ECN），这是你/一台路由器具备的特性（一件好事，额外的东西）。你报告的消息不一定与你的网络实验有关。可能是与整体网络流量相关的上下文问题，通常会告诉系统感知到的内容，以修改传输速度等等，等等。
【ECN 通过通知网络拥塞来减少数据包丢失和延迟，使发送设备在拥塞消除之前降低传输速率，而无需丢弃数据包。RFC 3168，即《IP 显式拥塞通知（ECN）的添加》，定义了ECN】。
阅读 RFC 文档是一个好习惯。
TCP/IP 是一个无穷无尽的深渊。建立坚实的基础并不容易。但要努力，隧道尽头有光明。
英文:
Try to read RFC 3168.
TCP/IP is a complex protocol (of protocols). Your congestion notification looks to be a congestion check (ECN) implemented in your router (or source-dest path), a feature your/a router has (a good thing, an extra thing). The message you report, not necessarily has to do with your networking experiment. Can be a context issue related with overall traffic on your (intra/external) net, what usually tell systems aware, to modify speed transmissions, among other things, etc.
[ECN notifies networks about congestion with the goal of reducing packet loss and delay by making the sending device decrease the transmission rate until the congestion clears, without dropping packets. RFC 3168, The Addition of Explicit Congestion Notification (ECN) to IP, defines ECN].
Reading RFCs is a good habit.
TCP/IP is an endless deep ocean. Getting a good foundation is not easy. But try hard, there is light at the end of the tunnel.
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