From: Matt Mullen (mullenm@gmail.com)
Date: Fri Feb 18 2005 - 22:30:21 GMT-3
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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