IPv6 equivalent of ARP - possibly dumb question

[Frank Bulk - iName.com]

Would it be this last line?

ICMP error messages limited to one every 100 milliseconds
ND reachable time is 30000 milliseconds
ND advertised reachable time is 0 milliseconds
ND advertised retransmit interval is 0 milliseconds
ND router advertisements are sent every 200 seconds
ND router advertisements live for 1800 seconds
                                  ^^^^

Frank

-----Original Message-----
From: Bøvre Jon Harald [mailto:Jon.Harald.Bovre at hafslund.no] 
Sent: Thursday, April 01, 2010 8:32 AM
To: frnkblk at iname.com; 'Gert Doering'
Cc: ipv6-ops at lists.cluenet.de
Subject: SV: IPv6 equivalent of ARP - possibly dumb question


Expiry timer should be 30 seconds

use 'show ipv6 interface' to find exact timers

Jon
________________________________________
Fra: ipv6-ops-bounces+jon.harald.bovre=hafslund.no at lists.cluenet.de
[ipv6-ops-bounces+jon.harald.bovre=hafslund.no at lists.cluenet.de] på
vegne av Frank Bulk - iName.com [frnkblk at iname.com]
Sendt: 1. april 2010 15:16
Til: 'Gert Doering'
Kopi: ipv6-ops at lists.cluenet.de
Emne: RE: IPv6 equivalent of ARP - possibly dumb question

Thanks for the insight.

They must expire quickly.  I pinged ipv6.google.com from a workstation and
that showed up in "sh ipv6 nei" as ACTIVE.  Very quickly it showed up as
stale.

Unfortunately, we don't have any netflow in place today.

Frank

-----Original Message-----
From: Gert Doering [mailto:gert at space.net]
Sent: Thursday, April 01, 2010 4:42 AM
To: Frank Bulk - iName.com
Cc: ipv6-ops at lists.cluenet.de
Subject: Re: IPv6 equivalent of ARP - possibly dumb question

Hi,

On Wed, Mar 31, 2010 at 08:05:07AM -0500, Frank Bulk - iName.com wrote:
> It's my understanding that the closest equivalent of ARP in IPv6 is "sh
ipv6
> neighbors".  When I do that on our Cisco 7206VXR running 12.2(31)SB16 I
see
> only a few addresses, not nearly all the ones that I know that the PCs
> "obtained" via SLAAC.

These entries seem to expire fairly quickly.

> How do I see which IPv6 hosts are actively sending traffic through/to our
> router?

By checking "show ipv6 neighbors" - that's the active hosts.  Most likely
the "unseen rest" is onyl using IPv4...

Alternatively, and if your IOS permits (I'm not sure about 12.2SB - 12.2S
does not, 12.2SR and 12.4 definitely do) you could use IPv6 netflow.

Gert Doering
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