IPv6 in the enterprise

[Mark Smith]

On Mon, 18 Apr 2011 17:45:36 -0400
Matthew Huff <mhuff at ox.com> wrote:

> So that when that ip address was discovered within monitoring systems we could do a reverse map back to the switch. Not possible with a link local. 
> 

I can see that might be useful for monitoring purposes, however I don't
understand what the benefits are of then using a GUA a default gateway
address on the end-nodes is. Wouldn't using link-locals for end-node
default gateway addresses would make renumbering to a different GUA an
easier task than the current efforts we have to go to in IPv4? 

> -----Original Message-----
> From: Mark Smith [mailto:nanog at 85d5b20a518b8f6864949bd940457dc124746ddc.nosense.org] 
> Sent: Monday, April 18, 2011 5:10 PM
> To: Matthew Huff
> Cc: 'Justin Krejci'; 'Mark Kamichoff'; 'Dale W. Carder'; 'ipv6-ops at lists.cluenet.de'
> Subject: Re: IPv6 in the enterprise
> 
> On Mon, 18 Apr 2011 13:20:37 -0400
> Matthew Huff <mhuff at ox.com> wrote:
> 
> > When I used a GUA for my HSRP address, Windows 7 would get confused after a few days and lose its global address. Switching to a link-local address for HSRP appears to have resolved that, although we are still testing. We are running SXI5 on a 6509/sup720
> > 
> > 
> 
> Why did you want to use GUA for your default router, other than
> "that's the way we do it in IPv4"?
> 
> > 
> > ----
> > Matthew Huff             | 1 Manhattanville Rd
> > Director of Operations   | Purchase, NY 10577
> > OTA Management LLC       | Phone: 914-460-4039
> > aim: matthewbhuff        | Fax:   914-460-4139
> > 
> > 
> > -----Original Message-----
> > From: Justin Krejci [mailto:jkrejci at usinternet.com] 
> > Sent: Monday, April 18, 2011 1:06 PM
> > To: Mark Kamichoff
> > Cc: Dale W. Carder; Matthew Huff; 'ipv6-ops at lists.cluenet.de'
> > Subject: Re: IPv6 in the enterprise
> > 
> > 
> > 
> > On Mon, 2011-04-18 at 12:02 -0400, Mark Kamichoff wrote:
> > > On Mon, Apr 18, 2011 at 10:39:56AM -0500, Dale W. Carder wrote:
> > > > We are using HSRP with static addressing (for link-local as well).
> > > > For the version of code that we are on, we couldn't use a global
> > > > address as the HSRP address, but this has not proved to be an issue.
> > > > In addition, it has had the nice side effect of being able to tell
> > > > everyone that the router is always fe80::1, regardless of what network
> > > > you are on.
> > > 
> > > We're doing the same exact thing with HSRP, and Cisco tells us that GUA
> > > addresses will be supported in the future.
> > 
> > According the documentation for 6509s the SXI4 release supports GUA for
> > HSRP. Previous to that you must use link-local for the virtual address.
> > http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/product_bulletin_c25_603217_ps708_Products_Bulletin.html
> > 
> > A quick google search also yields 12.4T has support for HSRP GUA.
> > http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6-fhrp.html#wp1062511
> > 
> >