On Tue, Nov 12, 2002 at 01:12:08PM +0100, Niels M?ller wrote: > Michal 'hramrach' Suchanek <[EMAIL PROTECTED]> writes: > > > On Wed, Nov 06, 2002 at 02:52:25PM +0100, Niels M?ller wrote: > > > Olivier P?ningault <[EMAIL PROTECTED]> writes: > > > > > > > You didn't understand correctly. Layer 2 translator performs ethernet + > > > > arp, not ip ! > > If you do not do IP int L2, how can you tell which L3 gets the packet? > > The interface for reading raw ethernet frames should primarily filter > on ethernet type code and ethernet addresses. If there are several > processes (say, two completely independent ip-stacks) that want to use > the same ethernet hardware and the same ethernet address, then the > simplest way is to have the ethernet driver deliver each received > frames to *both* processes. I think you completely misunderstood my post as your comments seem to be shifted by one layer. Or I misunderstood the pictures in prevois post. > > Or you can do something more clever with filters that look into packet > contents (I've heard that some network cards even has some hardware > support for that), but if you do that I think you want a nice general > interface, and not code knowledge about the inside of ip packets into > the ethernet driver. Of course, reading frames from ethernet card = reading _all_ frames unless the driver supplies some filter for whatever reason. One such filter is non-promiscuous mode (the default :). As I understansd the picture there is a layer L2 which has interface for sending/receiving frames (possibly w/o the frame headers) on one end and some ip interface on the other end. The ip interface allows the L3 translators to register some ip:s. I do not see any use for distinction between ip numbers and port numbers. They were probably designed to have one ip on each interface(machine?). Multiple ports used to address different applications/services. But that is no longer true and you may want multiple ip:s on one interface or single port with any ip etc. That makes the distinction between ip numbers and port numbers useless imho.
-- Michal Suchanek [EMAIL PROTECTED] _______________________________________________ Bug-hurd mailing list [EMAIL PROTECTED] http://mail.gnu.org/mailman/listinfo/bug-hurd
