Logical Link Control (LLC, IEEE 802.2)
XXX - add a brief LLC description here
XXX - add a brief description of LLC history
LLC can use a number of LAN (and MAN/WAN?) protocols as its transport protocol:
- ["Ethernet"]: LLC can be used for packets on ["Ethernet"] networks, although many protocols don't use it when running atop Ethernet.
- ["IEEE 802.11"]: LLC is used for data packets on ["IEEE 802.11"] networks.
- ["FDDI"]: LLC is used for data packets on ["FDDI"] networks.
XXX - Add example traffic here (as plain text or Ethereal screenshot).
The LLC dissector is fully functional.
(XXX add links to preference settings affecting how LLC is dissected).
Example capture file
XXX - Add a simple example capture file to the SampleCaptures page and link from here. Keep it short, it's also a good idea to gzip it to make it even smaller, as Ethereal can open gzipped files automatically.
A complete list of LLC display filter fields can be found in the [http://www.ethereal.com/docs/dfref/l/llc.html display filter reference]
Show only the LLC based traffic:
The way you capture only LLC-based protocols depends on the link-layer type of the network on which you're capturing.
XXX: Ethernet - look for packets with a length field, and maybe worry about IPX-over-raw-802.3; Token Ring, FDDI, and 802.11, check for data packets.
[http://standards.ieee.org/getieee802/802.2.html IEEE 802.2 specification]