Ask Your Question

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

asked 2018-01-02 18:15:43 +0000

ianc gravatar image

updated 2018-01-02 18:17:29 +0000

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?

edit retag flag offensive close merge delete


How and where are you making the capture?

grahamb gravatar imagegrahamb ( 2018-01-03 10:08:44 +0000 )edit

Hi Graham, I'm using a PC running WireShark (@ 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 gravatar imageianc ( 2018-01-03 10:15:20 +0000 )edit

1 Answer

Sort by ยป oldest newest most voted

answered 2018-01-03 11:13:01 +0000

grahamb gravatar image

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).

edit flag offensive delete link more


Thanks Graham

ianc gravatar imageianc ( 2018-01-03 15:27:08 +0000 )edit

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer

Question Tools


Asked: 2018-01-02 18:15:43 +0000

Seen: 40 times

Last updated: Jan 03