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IP Networking
The OSI-model
Post 17837 by J.P on Wednesday 20th of March 2002 02:27:24 PM
03-20-2002
The OSI-model
after reading a paper about the OSI-model I'm not exactly sure how to look at this model.
Does data (a file) travel from the application level "down" each layer at the client
Application
V
Presentation
V
Session
V
Transport
V
Network
V
Data link
V
|
|
| (Physical)
|
|
and "up" each layer (in reverse order: physical, data link, network etc..) at the server ?
After taking a look at a picture (http://www.cs.columbia.edu/~hgs/internet/it_stack.gif)
I noticed that there seems to be no data link activity between the
network (IPv4, IPv6) and physical layer (Ethernet)..
I couldn't be more confused. Any help at all is highly appreciated
Does data (a file) travel from the application level "down" each layer at the client
Application
V
Presentation
V
Session
V
Transport
V
Network
V
Data link
V
|
|
| (Physical)
|
|
and "up" each layer (in reverse order: physical, data link, network etc..) at the server ?
After taking a look at a picture (http://www.cs.columbia.edu/~hgs/internet/it_stack.gif)
I noticed that there seems to be no data link activity between the
network (IPv4, IPv6) and physical layer (Ethernet)..
I couldn't be more confused. Any help at all is highly appreciated
|
|
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LEARN ABOUT NETBSD
wakeonlan
WAKEONLAN(8) BSD System Manager's Manual WAKEONLAN(8) NAME
wakeonlan -- send Wake on LAN frames to hosts on a local Ethernet network SYNOPSIS
wakeonlan [interface] lladdr [lladdr ...] DESCRIPTION
The wakeonlan program is used to send Wake on LAN (WoL) frames over a local Ethernet network to one or more hosts using their link layer (hardware) addresses. WoL functionality is generally enabled in a machine's BIOS and can be used to power on machines from a remote system without having physical access to them. interface is an Ethernet interface of the local machine and is used to send the Wake on LAN frames over it. If there is only one Ethernet device available that is up and running, then the interface argument can be omitted. lladdr is the link layer address of the remote machine. This can be specified as the actual hardware address (six hexadecimal numbers separated by colons) or as a hostname entry in /etc/ethers. wakeonlan accepts multiple lladdr addresses. Link layer addresses can be determined and set using ifconfig(8). FILES
/etc/ethers Ethernet host name data base. SEE ALSO
ethers(5), ifconfig(8) AUTHORS
wakeonlan was written by Marc Balmer <marc@msys.ch>. BSD
May 25, 2012 BSD