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I can see any wireless modem around(networks) in internet access icon , How routers say to my computer "hey I am here ?" is it port forwarding ? upnp ? IGMP ? which protocol they send and in what port? How can I see those packet in wireshark? If I can see the packet dose it mean I can find their IP?

the protocols I mention was the first thing come in my mind because I think somehow they can be used for this action

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    Routers do not. WAPs do as part of the 82.11 standard.
    – Ron Maupin
    Mar 25 at 13:39
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Wireless access points transmit periodic beacon frames to announce the presence of wireless networks.

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WAPs send beacon frames to the STAs, and the STAs can send probe frames. This is all part of the 802.11 standard used by Wi-Fi.

Remember that the protocols you are referring to are layer-3 or above protocols, but 802.11 defines the physical (layer-1) and data-link (layer-2) protocols.

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