A bug in Package Sniffing and Spoofing Lab

[Jacob953]

Describe the bug
It's unable to change PROMISC model sometimes.
cat /sys/class/net/br-xxx/flags should be used to check PROMISC model rather than ifconfig, since command ifconfig cannot accurately feedback the status of PROMISC model.
By the way, 0x1003 means down, 0x1103 means the opposite.

Expected behavior
I found it easy to resolve this problem by rebuilding containers. But I'm curious about the reason why it went wrong.

Screenshots

[kevin-w-du]

This is an interesting issue, and I will look into this. The promiscuous mode in docker's network interface card has quite different behaviors than that on a physical NIC, because the underlying implementation uses Linux bridge, which is a smart bridge (i.e., it remembers the MAC addresses). Thanks for reporting the problem.