reliably detecting the presence of a bridge?

Dave Taht dave.taht at
Tue Dec 15 09:48:50 UTC 2015

I am curious if there is some sort of igmp or other form of message
that would reliably detect if a switch had a bridge on it. How could
deviceA detect deviceC was a bridge in this case?

deviceA  -> ethernet switch -> deviceB
                    ethernet switch -> deviceC with bridged wifi and ethernet

question came up in the context of:

Dave Täht
Let's go make home routers and wifi faster! With better software!

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