SLAAC(autoconfig) vs DHCPv6

Howard C. Berkowitz hcb at
Mon Aug 18 14:42:29 CDT 2008

To try to stay operational about this, I have a reality testing question
I've used in IPv4 and, for that matter, bridged networks:

If you want to test a resource, be it the end user or an infrastructure
interface, how do you know how to foo it (foo being some value of ping,
traceroute, look it up in SNMP/NetFlow, etc)?

I submit that if you use dynamic assignment of any sort, you really have to
have DNS dynamic update, so you can use a known name to query the function
that's indexed by address.  Otherwise, static addresses become rather
necessary if you want to check a resource. 

This was especially a question when L2 was "in" and routing was out: how do
you ping a MAC address?


-----Original Message-----
From: Scott Weeks [mailto:surfer at] 
Sent: Monday, August 18, 2008 3:34 PM
To: nanog at
Subject: SLAAC(autoconfig) vs DHCPv6

---------- trejrco at wrote: ------------
From: "TJ" <trejrco at>

As a general rule, most clients are following the "If we gave them static
IPv4 addresses we will give them static IPv6 addresses" (infrastructure,
servers, etc).  The whole SLAAC(autoconfig) vs DHCPv6 is a separate (albeit
related) conversation ...

I'm still an IPv6 wussie and would like to learn more before moving forward,
so would anyone care to share info on experiences with this decision?


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