IPv6 in the enterprise

[Matthew Huff]

I’m the guinea pig, and have the only windows 7 box, but the problem has been reported on this list as well as externally. I’m far from certain the HSRP GUA address is the culprit, but I have not had the problem since the change. What would happen is that my Windows 7 box that had gotten the address via SLAAC would lose the GUA address, but still have the local address. Rebooting the machine, or disabling/reenabling the nic would cause it to re-acquire the GUA. It happened a number of times but I never figured out the exact length of time required (more than a few days).


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Matthew Huff             | 1 Manhattanville Rd
Director of Operations   | Purchase, NY 10577
OTA Management LLC       | Phone: 914-460-4039
aim: matthewbhuff        | Fax:   914-460-4139

From: Justin Krejci [mailto:jkrejci at usinternet.com]
Sent: Monday, April 18, 2011 2:04 PM
To: Matthew Huff
Cc: 'Mark Kamichoff'; 'Dale W. Carder'; 'ipv6-ops at lists.cluenet.de'
Subject: RE: IPv6 in the enterprise

I have close to zero experience using Windows 7 at all much less with IPv6/HSRP+Win7

I would be interested to find out more about this issue, perhaps I will run it in the lab and see if I can replicate this behavior. Was your experience reproducible? did you try some basic things like bounce the nic on the Win7 box? Did you have other non-Win7 machines on the same network that continued to operate without issue when the Win7 starting having problems?

On Mon, 2011-04-18 at 13:20 -0400, Matthew Huff 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







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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<mailto: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




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