> Yoshihiro Ohba wrote: > I don't know if there is an official definition, but I > have usually heard the term "multihomed host" used to > refer to multi-interface systems that do not function > as routers (i.e. they don't forward packets).
Here is my reading of this: 1. Multi-interface host: > Margaret Wasserman wrote: > I don't know if there is an official definition, but I > have usually heard the term "multihomed host" used to > refer to multi-interface systems that do not function > as routers (i.e. they don't forward packets). I agree with Margaret. A host that has multiple interfaces connected to multiple subnets *is* a multihomed host, but... 2. A host that has multiple interfaces with addresses in the same subnet (either to increase throughput or to provide redundancy) is *not* a multihomed host. 3. Single interface, multiple address host: > Bill Sommerfeld wrote: > For what it's worth, I've occasionally heard the > term used in an application-layer context to refer > to hosts having multiple IP addresses rather than/in > addition to multiple interfaces. For v4, I agree with Bill *if* the multiple addresses belong to different subnets. For v6, this is blurry. Would you call multihomed a host that has both a link-local and a regular unicast address on the same interface? I don't think so. On the other hand, > Yoshihiro Ohba wrote: > There may be some scenario in which a single-interface > host is connected to multiple ISPs on the same link, which > seems to be not covered in the usual definition for > "multihomed host". I don't know what to call the model, > but is such a model already common? Or is there any > ongoing work on this model? This is possible as of today; a host that has multiple PA addresses is certainly considered a multihomed host. However, this alone is not a multihoming solution. 4. A host that has a single address but is part of a multihomed site: This would be the case for hosts belonging to a multihomed LIR, or the case of hosts connecting to a MHAP network. I do not call these hosts multihomed. In other words: semantically speaking, the fact that the host is connected to a multihomed router does not make the host itself multihomed, IMHO. Michel. -------------------------------------------------------------------- IETF IPng Working Group Mailing List IPng Home Page: http://playground.sun.com/ipng FTP archive: ftp://playground.sun.com/pub/ipng Direct all administrative requests to [EMAIL PROTECTED] --------------------------------------------------------------------
