SLAAC(autoconfig) vs DHCPv6 vs IP Address Lifecycle Management

John Lee john at
Mon Aug 18 21:17:33 CDT 2008


There are solutions that support both static, quasi-static, also driving DHCPv6 servers and Dynamic DNS updates. There are networks that have deployed IPal to automate and consolidate their IPv4 and IPv6 block allocations and interface assignments. Router Prefix delegation, SLAAC and DHCPv6 were implemented to have a more automated method of IPv6 address assignments because of the large potential number of IPv6 addresses to be assigned in a next generation network.

IPal does address block assignments for Prefix delegation, SLAAC and DHCPv6 support. It does IPv6 interface assignments of /64 EUI-64, /64 random, /126, /127 and /128 and generate the Dynamic DNS updates for those assignments.

E-mail me off list if you want any additional information.

John (ISDN) Lee
From: Howard C. Berkowitz [hcb at]
Sent: Monday, August 18, 2008 3:42 PM
To: nanog at
Subject: RE: SLAAC(autoconfig) vs DHCPv6

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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