From: Matt Mullen (mullenm@gmail.com)
Date: Sat Feb 19 2005 - 00:34:30 GMT-3
John,
Didn't mean to make it sound like 0000:0000:0000:0001 would be the
same as 210:7BFF:FE35:CC72. You're right, they are two completely
different host addresses. What I was getting at is that these are
examples of two different ways to assign IP addresses in IPv6. The
first, 2000::1 being an example of statically coding an address. Ths
second, an example of using the eui-64 option to have a host-id
automatically generated. I hope that makes more sense.
-Matt
On Sat, 19 Feb 2005 01:53:20 +0000, John Matus <john_matus@hotmail.com> wrote:
> ...but how is 210:7BFF:FE35:CC72 the same as 0000:0000:0000:0001. seems to
> me that they are 2 completely different host addresses. i under stand that
> you could use one or the other just like 10.1.1.1 or 10.1.1.2, but to me
> they seem to represent to distinctly different addresses :-0
> am i missing something?
>
> >From: Matt Mullen <mullenm@gmail.com>
> >Reply-To: Matt Mullen <mullenm@gmail.com>
> >To: John Matus <john_matus@hotmail.com>
> >CC: ccielab@groupstudy.com
> >Subject: Re: ipv6 eui 64 address
> >Date: Fri, 18 Feb 2005 20:30:21 -0500
> >
> >The difference is in the way the host part of the address is
> >represented. Without eui-64, in your example the host ID is 1. Or
> >to be more specific it is 0000:0000:0000:0001. With eui-64, the
> >host-id gets generated based on a mac address. So in the case where I
> >enabled eui-64 the host-id is 210:7BFF:FE35:CC72. Functionally they
> >are the same. It's just two different ways of representing the host
> >portion of the IPv6 address. I can't think of any other good reason
> >to use eui-64 except for that it could help to reduce the chance of
> >duplicate IP addresses being created. Question for the group: what
> >would be some reasons to use eui-64 addresses? Personally, I would
> >rather not use eui-64 because to me an address like 2000::1 is more
> >recognizable than 2000::210:7BFF:FE35:CC72.
> >
> >
> >On Fri, 18 Feb 2005 23:01:09 +0000, John Matus <john_matus@hotmail.com>
> >wrote:
> > > so.....i'm a bit confused. what is the functional difference between an
> > > ipv6 address w/out eui-64 and one w/ eui-64?
> > >
> > > >From: Matt Mullen <mullenm@gmail.com>
> > > >Reply-To: Matt Mullen <mullenm@gmail.com>
> > > >To: John Matus <john_matus@hotmail.com>
> > > >CC: ccielab@groupstudy.com
> > > >Subject: Re: ipv6 eui 64 address
> > > >Date: Fri, 18 Feb 2005 15:46:55 -0500
> > > >
> > > >Hi John,
> > > >
> > > >It won't use eui-64 unless you tell it to:
> > > >
> > > >R2#conf t
> > > >Enter configuration commands, one per line. End with CNTL/Z.
> > > >R2(config)#int lo100
> > > >R2(config-if)#ipv6 address 2000::1/64
> > > >R2(config-if)#do sh ipv6 int brie lo100
> > > >Loopback100 [up/up]
> > > > FE80::210:7BFF:FE35:CC72
> > > > 2000::1
> > > >R2(config-if)#
> > > >
> > > >R2#conf t
> > > >Enter configuration commands, one per line. End with CNTL/Z.
> > > >R2(config)#int lo100
> > > >R2(config-if)#ipv6 address 2000::1/64 eui-64
> > > >R2(config-if)#do sh ipv6 int brie lo100
> > > >Loopback100 [up/up]
> > > > FE80::210:7BFF:FE35:CC72
> > > > 2000::210:7BFF:FE35:CC72
> > > >
> > > >HTH,
> > > >
> > > >Matt
> > > >
> > > >
> > > >On Fri, 18 Feb 2005 20:39:23 +0000, John Matus <john_matus@hotmail.com>
> > > >wrote:
> > > > > is eui-64 the default ipv6 address type.........meaning if i do a:
> > > > >
> > > > > ipv6 address 2000::1/64, will that show up in the config as
> >2000::1/64
> > > > > eui-64? <i don't have a router in front of me>
> > > > >
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