On Fri, Mar 21, 2003 at 01:08:15PM +1200, Jim Cheetham wrote: [snip] Thanks Jim, better than I would have explained it.
> All this is based on Ethernet - and your DSL line isn't Ethernet. So it > is impossible to bridge your LAN (which is Ethernet) with the DSL link. (Hence why I said that it wasnt a bridge, but a router) > In order to get traffic from your Ethernet LAN to your DSL > circuit-connected network, you need to use a network protocol that > isn't wedded to the physical network it runs on. Enter Internet > Protocol, IP. IP runs on many different physical networks - especially > Ethernet and your DSL link. All of your Ethernet PCs can continue to > use Ethernet to talk to each other, but in order to talk to the outside > world, they have to use IP. In the local network, all the IP traffic is > moved around in Ethernet frames, but that work is now done by low level > networking software, and the IP software never knows about it. Enter the 7-layer OSI model. http://www.wikipedia.org/wiki/OSI_model http://www.btinternet.com/~c.j.duley/osi_reference_model.htm http://www.cs.wmich.edu/~yang/tlt/cs555/ http://www.techexams.net/technotes/ccna/osimodel.shtml Ad Nauseam... Mike. -- Mike Beattie <[EMAIL PROTECTED]> ZL4TXK, IRLP Node 6184 If you can stay calm, while all around you is chaos... Then you probably haven't completely understood the seriousness of the situation.
