首页 \ 问答 \ 为什么iftop没有显示组播IP的带宽，但tcpdump呢？(Why does iftop show no bandwidth from a multicast IP but tcpdump does? ffmpeg also cannot capture from the multicast)

为什么iftop没有显示组播IP的带宽，但tcpdump呢？(Why does iftop show no bandwidth from a multicast IP but tcpdump does? ffmpeg also cannot capture from the multicast)

 当试图接收组播IP（来自239.193.140.11:1234的视频）时，我遇到了一个令人费解的问题。  
 当$tcpdump dst 239.193.140.11 -w capturedData.pcap ，数据包被正确捕获。  
 例如11：05：25.357138 IP 192.168.34.34.46192> 239.193.140.11.1234：UDP，长度1328  
 这意味着我的机器正在接收组播IP数据包。  
 但是，当$iftop -i any运行时，iftop不显示来自239.193.140.11的任何带宽。 此外，当我尝试使用ffmpeg捕获多播数据包时： $ffmpeg -i udp://239.193.140.11:1234?localaddr=192.168.34.34 ，不捕获任何数据包。  
 为什么tcpdump和iftop显示的内容之间存在差异，以及如何解决它，以便ffmpeg可以正确捕获？ 

I ran into a puzzling problem when trying to receive a multicast IP (of a video from 239.193.140.11:1234). 
When $tcpdump dst 239.193.140.11 -w capturedData.pcap, the packets are captured correctly.  
eg, 11:05:25.357138 IP 192.168.34.34.46192 > 239.193.140.11.1234: UDP, length 1328 
This means that my machine is receiving the multicast IP packets. 
However, when $iftop -i any is run, iftop doesn't show any bandwidth from 239.193.140.11. Furthermore, when I try to capture the multicast packets with ffmpeg: $ffmpeg -i udp://239.193.140.11:1234?localaddr=192.168.34.34, no packets are captured. 
Why is there a discrepancy between what tcpdump and iftop shows, and how to resolve it so that ffmpeg can capture correctly?

原文：https://stackoverflow.com/questions/48771108

更新时间：2022-07-21 09:07

最满意答案

 有各种方法。 最简单的方法是终止当前连接池中的连接的数据库会话。 如果由于某种原因，您希望强制该错误持续发生，我想您可以修改 Oracle数据库用户的配置文件以设置IDLE_TIME （假设您的应用程序在连接池中保持连接以获得合理的一段的时间）。 

There are various approaches. The simplest would be to kill the database sessions for the connections that are currently in the connection pool. If, for some reason, you want to force that error to occur on an ongoing basis, I suppose that you could modify the profile for the Oracle database user to set an IDLE_TIME (assuming that your application maintains connections in the connection pool for a reasonable period of time).

为什么iftop没有显示组播IP的带宽，但tcpdump呢？(Why does iftop show no bandwidth from a multicast IP but tcpdump does? ffmpeg also cannot capture from the multicast)

最满意答案

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