Difference Between SSID, BSSID, and ESSID
ESS is the union of a set of BSS's. ESSID and BSSID are just their IDs respectively. ESSID is the na En savoir plus
Meaning of ff ff ff ff ff ff
Rémy Colas
2025-12-24 23:33:48
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: 1
The MAC address used for broadcast (broadcast MAC address) is ff:ff:ff:ff:ff:ff. Broadcast MAC address is a MAC address consisting of all binary 1s. Broadcast is "one to all" type of communication. In other words; "send once receive all". If all the eight bits in an octet is binary 1 (11111111), it can be represented in hexadecimals as "ff". Also note that all other 48-bits of a broadcast MAC addresses are binary ones (1s). As the packet moves down the TCP/IP protocol stack from layer 3 (network layer) to layer 2 (datalink layer) at the sending computer, if the destination IPv4 address is limited broadcast address or a directed broadcast address the IPv4 datagram packet will be encapsulated with an Ethernet frame with broadcast MAC address (ff:ff:ff:ff:ff:ff) as the destination MAC address. Once the Ethernet frame reaches the network switch, if the destination MAC address is broadcast MAC address (ff:ff:ff:ff:ff:ff), the network switch will forward the Ethernet frame to all its active ports, so that all the devices in the broadcast domain will receive a copy. The point to remember is that for both limited broadcast and directed broadcast, the broadcast MAC address used is ff:ff:ff:ff:ff:ff.
Zacharie Poulain
2025-12-19 17:06:35
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: 2
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The Equivalence of BSSID and SSID
ESSID and BSSID are just their IDs respectively. My understanding is that ESSID is the name of the a En savoir plus
Victor Payet
2025-12-12 00:01:42
Nombre de réponses
: 4
My PCs MAC address ends with FF:FF:FF. As per my knowledge MAC address is of 12 Hex digits (first 6 correspond to Company and second half to a unique NIC). And as NIC numbers may be between 00:00:00 and FF:FF:FF (both exclusive). 00:00:00 and FF:FF:FF are not assigned. It is true that all 0's or all F's have special group meanings, but that includes the vendor ID, so a FF-FF-FF in the OUI is fine as long as the vendorID portion is not FF-FF-FF as well.
André Delaunay
2025-12-01 06:39:29
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: 2
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ESS ID
The Extended Service Set Identification (ESSID) is an identifier for your wireless network. Specify En savoir plus
Jacques Fernandez
2025-12-01 02:39:12
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: 2
The sending computer will of course know its source MAC address but how does it know the destination MAC address?
That’s where ARP comes into play.
Now wait a second…how does H1 know about the MAC address of H2?
We know the IP address because we typed it but there is no way for H1 to know the MAC address of H2.
There is another protocol we have that will solve this problem for us, it’s called ARP (Address Resolution Protocol).
The ARP table is empty so we have no clue what the MAC address of H2 is.
The first thing that will happen is that H1 will send an ARP Request.
This message basically says “Who has 192.168.1.2 and what is your MAC address?”
Since we don’t know the MAC address we will use the broadcast MAC address for the destination (FF:FF:FF:FF:FF:FF).
This message will reach all computers in the network.
Above you see the ARP request for H1 that is looking for the IP address of H2.
The source MAC address is the MAC address of H1, the destination MAC address is “Broadcast” so it will be flooded on the network.
Ethernet II, Src: Vmware_e7:0f:2e (00:0c:29:e7:0f:2e), Dst: Broadcast (ff:ff:ff:ff:ff:ff)