reliably detecting the presence of a bridge?

Matthew Kaufman matthew at
Tue Dec 15 14:46:51 UTC 2015

Why do you care if there's a bridge? Seems you care about higher latency, packet loss, lower reliability, etc. Measure what matters and act on that, rather than trying to guess performance from link type.

Matthew Kaufman

(Sent from my iPhone)

> On Dec 15, 2015, at 5:48 AM, Dave Taht <dave.taht at> wrote:
> 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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