multiple prefixes

Frank Bulk frnkblk at
Sat Feb 9 20:25:38 CET 2013

I happen to be using two /64's in one non-end user VLAN and I've had no
issues thus far.


-----Original Message-----
From: at
[ at] On Behalf Of
David Magda
Sent: Saturday, February 09, 2013 8:17 AM
To: ipv6-ops at
Subject: multiple prefixes


Is anyone doing two or more prefixes per VLAN? Specifically I'm toying with
the idea of having a provider dependent (PD) prefix which uses the privacy
options (RFC 3041/4941) for external surfing, and a ULA-based prefix for
internal traffic (using EUI for better logging).

>From what I could find, there aren't any RA options to specify whether
privacy options should be used on a per prefix basis. You'd have to use
DHCPv6, with IA_TA for privacy-desired prefixes, and IA_NA for the ULA
prefixes. (Of course ISC DHCPd doesn't support sending out multiple prefixes
as of the current 4.2.x series.)

Has anyone done this, or considered doing it? Pros/cons? 

Thanks for any info.


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