Question on DHCPv6 address assignment

2014-01-31 Thread Fernando Gont 
Folks,

I'm wondering about the following two aspects of different DHCPv6
implementations out there:

1) What's the pattern with which addresses are generated/assigned? Are
they sequential (fc00::1, fc00::2, etc.)?  Random? Something else?

2) What about their stability? Is there any intent/mechanism for them to
be as stable as possible? Or is it usual for hosts to get a new
address for each lease?

P.S.: I understand this is likely to vary from one implementation to
another... so please describe which implementation/version you're
referring to.

Thanks!

Best regards,
-- 
Fernando Gont
e-mail: ferna...@gont.com.ar || fg...@si6networks.com
PGP Fingerprint: 7809 84F5 322E 45C7 F1C9 3945 96EE A9EF D076 FFF1

Re: Question on DHCPv6 address assignment

2014-01-31 Thread Fernando Gont 
Hi, Bill,

On 01/31/2014 05:59 PM, bmann...@vacation.karoshi.com wrote:
 
 i in my bespoke version:

Is there any reference I could use for it?


 1- psudo-random within a /32 space
 2- not stable, unless coded to a fixed address

Regarding 2), do you mean they are only stable if you ahve a MAC-IPv6
mapping database, or something else?

Cheers,
-- 
Fernando Gont
e-mail: ferna...@gont.com.ar || fg...@si6networks.com
PGP Fingerprint: 7809 84F5 322E 45C7 F1C9 3945 96EE A9EF D076 FFF1

Re: Question on DHCPv6 address assignment

2014-01-31 Thread Owen DeLong 

On Jan 31, 2014, at 12:40 PM, Fernando Gont ferna...@gont.com.ar wrote:

 Folks,
 
 I'm wondering about the following two aspects of different DHCPv6
 implementations out there:
 
 1) What's the pattern with which addresses are generated/assigned? Are
 they sequential (fc00::1, fc00::2, etc.)?  Random? Something else?
 

Depends on your DHCPv6 server implementation. I believe ISC defaults to random. 
I’m not sure if that’s configurable or not.

 2) What about their stability? Is there any intent/mechanism for them to
 be as stable as possible? Or is it usual for hosts to get a new
 address for each lease?

I believe they are generally stable in that once a DUID is associated with an 
address, that association is persistent, but that may also be implementation 
dependent.

 
 P.S.: I understand this is likely to vary from one implementation to
 another... so please describe which implementation/version you're
 referring to.

I have limited experience with the ISC DHCPv6 server. Mostly I just use SLAAC.

Owen