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Yoshihiro Ohba | 9 Oct 21:28

multihomed host

Hi,

I have one question about multihomed host.

In the multi6 WG charter, there is the following definition 
for multihomed "site":

  A multihomed site is a site that has more than one connection to the
  public internet with those connections through either the same or
  different ISPs.  Sites choose to multihome for several reasons,
  especially to improve fault tolerence, perform load balancing, etc.

Is there any definition for multihomed "host"?  

Of cource, a definition would be quickly made by just replacing a
word "site" in the above definition with "host", but please let me
know if there is other definition.

Regards,
Yoshihiro Ohba

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Margaret Wasserman | 9 Oct 21:42
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Re: multihomed host


>
>
>Is there any definition for multihomed "host"?

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).

Margaret

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Yoshihiro Ohba | 9 Oct 22:09

Re: multihomed host


Thanks for your quick response.

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?

On Wed, Oct 09, 2002 at 03:42:47PM -0400, Margaret Wasserman wrote:
> 
> >
> >
> >Is there any definition for multihomed "host"?
> 
> 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).
> 
> Margaret
> 

Thanks,

Yoshihiro Ohba

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Bill Sommerfeld | 9 Oct 22:31
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Re: multihomed host

> 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).

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. 

						- Bill
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Michel Py | 10 Oct 00:21
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RE: multihomed host

> 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
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Bill Sommerfeld | 10 Oct 00:48
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Re: multihomed host

> 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.

From the point of view of what applications need to do, it's safest to
assume that all V6 hosts are multiaddressed.

						- Bill

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Michel Py | 10 Oct 00:55
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RE: multihomed host

> Bill Sommerfeld wrote:
> From the point of view of what applications need to do,
> it's safest to assume that all V6 hosts are multiaddressed.

Strongly agree. Although multiaddressed does not necessarily mean
multihomed, it is likely that part of the multihoming solution is
multiadressed hosts.

Michel.

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Yoshihiro Ohba | 10 Oct 01:20

Re: multihomed host

Thank you all for helping me understand.

I have additional question below.

On Wed, Oct 09, 2002 at 03:21:34PM -0700, Michel Py wrote:
> 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.
> 

What additional things need to be considered for this usage to become
a multihoming solution?

Yoshihiro Ohba

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Ragib, Husain B (UMKC-Student | 10 Oct 04:39
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RE: multihomed host

[ post by non-subscriber.  with the massive amount of spam, it is easy to
  miss and therefore delete mis-posts.  so fix subscription addresses! ]

Multi-Homed Hosts: These are any machines which has more than one
interface to connect to multiple networks. There are lots of
complication involved when thinking in terms of Multi-homed hosts, such
as routing tables entrys and local hosts IP address translations to name
a few.

An interesting point to note in Multi-Homed hosts is that it can be
visaulised as a normal computer with two NIC and two IP address of two
diffrent networks. Here it could just be sitting and recieving traffic
from both network and rarely if anytime be involved in routing
functions.(Or else it would become a Router..Though there is a
distinction between those two..]

hope this helps..

Husain

-----Original Message-----
From: owner-multi6 <at> ops.ietf.org [mailto:owner-multi6 <at> ops.ietf.org]On
Behalf Of Bill Sommerfeld
Sent: Wednesday, October 09, 2002 3:31 PM
To: Margaret Wasserman
Cc: Yoshihiro Ohba; ipng <at> sunroof.eng.sun.com; multi6 <at> ops.ietf.org
Subject: Re: multihomed host 

[ post by non-subscriber.  with the massive amount of spam, it is easy
to
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Michel Py | 10 Oct 08:11
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RE: multihomed host

>>> 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?

>> Michel Py wrote:
>> 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.

> What additional things need to be considered for this
> usage to become a multihoming solution?

There is no simple answer to this question. Here is one approach:
http://arneill-py.sacramento.ca.us/ipv6mh/draft-bagnulo-mhExtHdr-00.txt

Michel.

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Gmane