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Re: SLAAC(autoconfig) vs DHCPv6

  • From: Dale W. Carder
  • Date: Mon Aug 18 16:24:12 2008

Hey Scott,

On Aug 18, 2008, at 2:33 PM, Scott Weeks wrote:
From: "TJ" <[email protected]>

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?

Here's some pro's and con's to both

SLAAC:
- widely implemented in host v6 stacks that have shipped
- widely implemented on v6 routers
- really, really, really broken: it didn't support handing out
  any DNS info until RFC 5006, thus SLAAC still requires human
  intervention on a client to make "teh v6 interwebs" work.  It
  will probably be a painful wait until 5006 gets more widely
  implemented on hosts (if ever, for some) & routers.
- probably "faster" than dhcpv6 w/ tuning timers.  Could be
  better for mobile thingys.
- supports RFC 3041 "security by obscurity" extensions.

DHCPv6
- doesn't ship w/ some OS's
- new (danger code), not all features implemented
- router support for dhcpv6 relay very limited
- advanced things like prefix delegation don't really seem to
  have been ironed out.

In case you weren't confused enough between the two, they are not
mutually exclusive.  You can run both SLAAC and DHCPv6 at the same
time on the same L2.

Links for (2) dhcpv6 implementations:
http://klub.com.pl/dhcpv6/
http://www.isc.org/index.pl?/sw/dhcp/dhcp4_0.php

Cheers,
Dale