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why cant I see both sides of a SSDP M-SEARCH interaction?

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I'm trying to understand the interaction between an SSDP M-Search initiator (Amazon Echo) and an ESP8266 based device emulating a Wemo switch.

I can see the the initiation message from the Echo in the WireShark packet log but not the response from the device although I am certain it is sent because the Echo acts on the response.

I know the IP and mac addr of both the devices.

I should say that this is the first time I've used WireShark.

What am I doing wrong?

ianc's avatar
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ianc
asked 2018-01-02 18:15:43 +0000, updated 2018-01-02 18:17:29 +0000
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How and where are you making the capture?

grahamb's avatar grahamb (2018-01-03 10:08:44 +0000) edit
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Hi Graham, I'm using a PC running WireShark (@192.168.1.100) on the same private subnet as both devices (.32 and .72) Devices are Wifi connected, PC is wired. All on same router.

Standard out of the box set-up for WireShark - I just then filtered the network traffic on the IPs.

ianc's avatar ianc (2018-01-03 10:15:20 +0000) edit
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1 Answer

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As you're not capturing on the router\AP, but on a PC connected to the router (which is in all likelihood a switch), then you'll only see broadcasts from the devices.

You can confirm this by looking at the initiation message and checking the destination IP.

To capture the non-broadcast traffic you'll need to either capture on the router, or over the air (which is problematic if using Windows for wireless capture).

grahamb's avatar
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grahamb
answered 2018-01-03 11:13:01 +0000
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Thanks Graham

ianc's avatar ianc (2018-01-03 15:27:08 +0000) edit
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