nanog mailing list archives
Re: IPv6 RA vs DHCPv6 - The chosen one?
From: Mohacsi Janos <mohacsi () niif hu>
Date: Fri, 23 Dec 2011 07:03:34 +0100 (CET)
On Thu, 22 Dec 2011, Tomas Podermanski wrote:
Hi, On 12/22/11 12:04 AM, Michael Sinatra wrote:On 12/21/11 12:40, Ray Soucy wrote:I'm afraid you're about 10 years too late for this opinion to make much difference. ;-) We have been running IPv6 in production for several years (2008) as well (answering this email over IPv6 now, actually) yet I have completely different conclusions about the role of RA and DHCPv6. Weird.And that's a very good reason not to deprecate SLAAC. Tomas may prefer DHCPv6, and he may provide reasons others may prefer DHCPv6. But he hasn't provided justification for deprecating SLAAC.I am not against SLAAC. I am against the way how DHCPv6 & SLAAC works today. Today, SLAAC can not live without DHCPv6 and DHCPv6 can not live without SLAAC (RA). Second reason is that we have two protocols/techniques to do just the same thing. I prefer to have just ONE common autoconfiguration method as we have it in IPv4. Because DHCPv6 is more complex and SLAAC can provide only subset of DHCP functionality I personaly prefer DHCPv6.
This is your personal preference. Some has other personal preference.
Many of us have been working with IPv6 for years and have found SLAAC to be quite useful. The biggest benefit it provides, which Tomas did not acknowledge, is the ability to autoconfigure hosts without running a central server. That said, I have also found DHCPv6 to be quite useful.We have to use SLAAC as well because we do not have other choice. Not all operating systems supports DHCPv6 today. But we are not happy about it (problems with privacy extensions, security as I mentioned before). DHCPv6 do not have to be run on a central server. DHCPv6 can be implemented as a part of a router as well. It is common for DHCP(v4) an implementations for DHCPv6 are available today (eg. cisco http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6-dhcp.html).
Similar configuration o routers: - enabling ipv6 relay agent -> DHCPv6 configuration- enabling router advertisment on interace -> SLAAC (some routers has to oppposite)
I also agree with Owen: Provide two complete solutions, and let operators choose based on their needs. That implies fixing DHCPv6 so I don't have to go in and disable the autonomous flag on my routers and run RAs just to get a default route. But it also implies not deprecating either SLAAC or DHCPv6.Although we have differed opinion whether we need one or two autoconfiguration protocols, I totally agree that "fixing" DHCPv6 is a really necessary step and It should have been done many years ago. Btw. not all people agree that DHCPv6 should be fixed in that way. There was a discussion in 2009 in dhcwg (thread available on: http://www.ietf.org/mail-archive/web/dhcwg/current/msg09715.html). The current draft (draft-ietf-mif-dhcpv6-route-option-03) is the 3rd attempt to do it. In past, there were another two drafts trying to introduce route information into DHCPv6: draft-droms-dhc-dhcpv6-default-router-00, expired September 2009 draft-dec-dhcpv6-route-option-05, expired April 2011 So I hope that this time we will have more luck :-)
I am also supporting this....
Tomas
Current thread:
- Re: Misconceptions, was: IPv6 RA vs DHCPv6 - The chosen one?, (continued)
- Re: Misconceptions, was: IPv6 RA vs DHCPv6 - The chosen one? Masataka Ohta (Dec 28)
- Re: Misconceptions, was: IPv6 RA vs DHCPv6 - The chosen one? Doug Barton (Dec 28)
- Re: Misconceptions, was: IPv6 RA vs DHCPv6 - The chosen one? TJ (Dec 28)
- Re: Misconceptions, was: IPv6 RA vs DHCPv6 - The chosen one? Christopher Morrow (Dec 28)
- Re: Misconceptions, was: IPv6 RA vs DHCPv6 - The chosen one? Iljitsch van Beijnum (Dec 30)
- Re: IPv6 RA vs DHCPv6 - The chosen one? Tomas Podermanski (Dec 21)
- Re: IPv6 RA vs DHCPv6 - The chosen one? Ray Soucy (Dec 21)
- Re: IPv6 RA vs DHCPv6 - The chosen one? William Herrin (Dec 21)
- Re: IPv6 RA vs DHCPv6 - The chosen one? Michael Sinatra (Dec 21)
- Re: IPv6 RA vs DHCPv6 - The chosen one? Tomas Podermanski (Dec 22)
- Re: IPv6 RA vs DHCPv6 - The chosen one? Mohacsi Janos (Dec 22)
- Re: IPv6 RA vs DHCPv6 - The chosen one? Michael Sinatra (Dec 23)
- Re: IPv6 RA vs DHCPv6 - The chosen one? Tomas Podermanski (Dec 22)
- Re: IPv6 RA vs DHCPv6 - The chosen one? Valdis . Kletnieks (Dec 22)
- Re: IPv6 RA vs DHCPv6 - The chosen one? Mohacsi Janos (Dec 22)
- Re: IPv6 RA vs DHCPv6 - The chosen one? Tomas Podermanski (Dec 23)
- Re: IPv6 RA vs DHCPv6 - The chosen one? Ray Soucy (Dec 23)
- Re: IPv6 RA vs DHCPv6 - The chosen one? Tomas Podermanski (Dec 23)
- Re: IPv6 RA vs DHCPv6 - The chosen one? Mohacsi Janos (Dec 23)
- Re: IPv6 RA vs DHCPv6 - The chosen one? Jeff Wheeler (Dec 23)
- Re: IPv6 RA vs DHCPv6 - The chosen one? Mohacsi Janos (Dec 23)