If you do that, they would surely appreciate if you had all the relevant details ready at hand when doing so, like your apartment/room/whatever number and any identification codes that may be written on the network wall socket you're using. If the switch you're connected to uses one of them that is decodable by tcpdump, you will see the decoded results among the output of the first tcpdump command I mentioned above.Īnd of course, you could contact your university's local network support personnel. If the switches in your network won't send LLDP packets, there are various older vendor-specific discovery protocols you might try. The available information may vary between switch models and firmware versions, but it should be useful in figuring out 'what's the other end of this network cable connected to?' System Name TLV (5), length 12: switch123456 <- switch name configured by network admin

Subtype Interface Name (5): gi2 <- switch port identifier If you receive one, tcpdump will decode the information blocks in the packet like this: 23:52:08.998832 LLDP, length 131 To capture an incoming LLDP packet (and nothing else) using tcpdump, you could do something like this: sudo tcpdump -Knv -s0 -i eno1 -c 1 ether proto 0x88ccĪnd wait for a minute or two for the switch to send a LLDP information packet. LLDP is a vendor-neutral discovery protocol that seems to be increasingly supported by modern enterprise-grade switches from several vendors. Many enterprise-grade network switches may also periodically output discovery protocol packets on each of their ports, carrying the identification of the switch and port and optionally various other information useful for network management. The source addresses of packets you may see may allow you to identify the network segment you're connected to. This command will output information of any incoming network packet it will see on the wire. You could use tcpdump to listen for broadcasts and any other background traffic in the cable to determine the IP addresses in use on the network, with something like (assuming your network interface is eno1: sudo tcpdump -i eno1 -s0 -Knv A SSID is a property that is specific to Wi-Fi networks only - a wired ethernet network does not have one.

How to find ssid from bssid