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[ih] Origin of the loopback interface


You are correct.  This problem was solved as soon as it was discovered around 1972 and solved several times.  XNS, CYCLADES and as you point out CLNS all solved it.  It is more a problem, as you say, with IP ideology. 

As you say, it is just the tip of the iceberg.

Take care,

> On Oct 23, 2017, at 13:21, Toerless Eckert <tte at cs.fau.de> wrote:
> On Sun, Oct 22, 2017 at 03:19:50AM -0700, Paul Vixie wrote:
>> multihoming is one of the great unsolved problems in internetworking. we 
>> do it properly on routers -- there, the loopback has the router's "real" 
>> ip address -- but only because the router is on-path and can inject its 
>> loopback address (which usually is not subnetted) into the topology.
> I am not sure if multihoming is a great unsolved problem in internetworking.
> It just seems to be a problem with IPs ideology. As opposed to let's say
> CLNS ideology of node addresses.
> In the early 90th i had on pretty much every vendors unix system available nodes
> with 10 Mbps ethernet and FDDI, and of course the FDDI on each node worked
> randomnly 90% of the time (especially in a ring with 10++ vendor NICs). In
> the face of NFS, the only way to keep the network running was to let those
> MHH participate in the IGP and inject their addresses as host routes.
> And when IPv6 came out i was so disappointed that it still did not
> acknowledge / describe the notion of node addresses.
> Now with IETF ANIMA WG and ACP, we're automation the creation and routing for
> node addresses and try to figure out how to use the correct terminology.
> "loopback" seems to be the common term used for "internal" interfaces. Not
> that there is a real definition of "internal" interfaces either. And of
> course there is also no IPv6 architecture description that "loopback" addresses
> could have global scope addresses. Thats just a decade old deployment reality
> not described by the architecture.
> And thats just the tip of the iceberg.
> Cheers
>    Toerless
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