Diffusion FreeBSD src repository 2d3614fb132b

bridge: Log MAC address port flapping
2d3614fb132b
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Description

bridge: Log MAC address port flapping

MAC flapping occurs when a bridge receives packets with the same source MAC
address on different member interfaces. The common reasons are:

user roams from one bridge port to another
user has wrong network setup, bridge loops e.g.
someone set duplicated ethernet address on his/her nic
some bad guy / virus / trojan send spoofed packets

if_bridge currently updates the bridge routing entry silently hence it is hard
to diagnose.

Emit logs when MAC address port flapping occurs to make it easier to diagnose.

Reviewed by: kp
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D39375

Details

Provenance

zlei	Authored on Apr 7 2023, 2:25 PM

Reviewer

Differential Revision

D39375: bridge: Log MAC address port flapping

Parents

rG09e5e3d59860: ifconfig: Fix configuring if_bridge with additional operating parameters

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Event Timeline

zlei committed rG2d3614fb132b: bridge: Log MAC address port flapping (authored by zlei).Apr 7 2023, 2:25 PM

zlei added an edge: D39375: bridge: Log MAC address port flapping.

zlei mentioned this in D39465: bridge.4: Document the net.link.bridge.log_mac_flap variable.Apr 8 2023, 11:15 AM

zlei mentioned this in rG3fdb40d1befe: bridge.4: Document the net.link.bridge.log_mac_flap sysctl variable.Apr 10 2023, 10:08 AM

zlei mentioned this in D39542: bridge: Use %D identifier to format MAC address.Apr 13 2023, 3:13 AM

zlei mentioned this in rG9af6f4268ac3: bridge: Use the %D identifier to format MAC address.Apr 14 2023, 10:10 AM

zlei mentioned this in rGde53ebb0f20e: bridge: Log MAC address port flapping.Apr 21 2023, 10:11 AM

zlei mentioned this in rG303d9a593bdd: bridge: Log MAC address port flapping.Apr 21 2023, 10:18 AM

zlei mentioned this in rG5a3f517110ef: bridge.4: Document the net.link.bridge.log_mac_flap sysctl variable.Sep 1 2023, 10:09 AM

zlei mentioned this in rGdddf410362b9: bridge.4: Document the net.link.bridge.log_mac_flap sysctl variable.Sep 1 2023, 10:11 AM

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sys/

net/

rG2d3614fb132b

sys/net/if_bridge.c

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