On Sun, Apr 02, 2000 at 03:49:53AM +0400, Aleksandr A.Babaylov wrote:
> Eric Peterson writes:
> [Charset iso-8859-1 unsupported, filtering to ASCII...]
> > Tony Finch [mailto:[EMAIL PROTECTED]] wrote:
> > > Nik Clayton <[EMAIL PROTECTED]> wrote:
> > >>
> > >> I thought that 127/8 was the "local net", and that
> > >> packets sent to any of those addresses would go via
> > >> the loopback interface. That seems to be how Linux
> > >> and Windows 98 do things (the only systems I can
> > >> check this on at the moment). Assuming that's the
> > >> case, why does FreeBSD only add a a host route to
> > >> 127.0.0.1, and not a network route for 127/8?
> > >
> > > I did some further investigation to see how old this
> > > oddity is and it seems to be the way BSD has always
> > > handled the loopback interface. There's an explicit
> > > exclusion in the interface initialization code in in.c
> > > that gives loopback interfaces a host route instead of
> > > the network route that a normal interface gets and it's
> > > been that way for 15 years.
> >
> > I always thought it was a great waste of network address
> > space to devote an entire class A network to a single
> > loopback address. An idea I got from a co-worker a while
> > ago was to allow the 127.* (or some smaller subnet of 127)
> > to be devoted to "intra-box addresses", for example:
> >
> > 1. A cluster of devices/slots within a chassis
> > 2. A parallel processing machine
> > 3. A multi-processor computer/device
This is how Cisco is using it on their Catalyst switches for example.
> >
> > All of the above may have inter-processor communications
> > that do not need to leave the chassis. Analogous to how
> > the 192.168.* (RFC1918) addresses are used for intranets,
> > these addresses wouldn't be allowed to be seen by the outside
> > world (i.e. outside the "chassis"), but would permit internal
> > IP communication without having to waste (and configure) a
> > "real" IP net number. If these devices needed to get to the
> > outside world, they could use NAT (again, analogously to the
> > RFC1918 case).
> I use addresses from 127/8 net for p2p connections
> when security is useful.
> TCP/IP pakets with 127.X.X.X has only one hop to live
> and never be routed by BSD kernel.
> may be 0/8 net is similar - I don't remember.
>
> --
> @BABOLO http://links.ru/
>
>
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--
Regards, Ulf.
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