Hi Thomas,
Not using Cox here but in a similar setup here I use the dhcpcd package just 
for getting IPv6 from the ISP with SLAAC and prefix delegation. You will need 
to configure your /etc/dhcpcd.conf file to something looking like that:
noipv6rs
ipv6only
slaac private
nohook resolv.conf
interface em0
ipv6rs
iaid 1
ia_pd 2 em1/1
In that example em0 would be the WAN interface and em1 the LAN interface.
Good luck,
M.

> -------- Original Message --------
> Subject: Dynamic IPv6
> Local Time: July 8, 2017 4:42 AM
> UTC Time: July 8, 2017 2:42 AM
> From: inq...@protonmail.com
> To: misc@openbsd.org <misc@openbsd.org>
> My ISP (Cox) supports IPv6 and I have this working on a MikroTik router--it 
> pulls an address and prefix, creates a default route, creates an address pool 
> for internal client, etc.
> I"ve been working to configure a similar setup in OpenBSD 6.1 and I"ve been 
> unable to even get the outside interface to pull an IPv6 address from Cox.
> I"ve been searching for some time today to find information on how to 
> configure this but there are many different "how tos" and not one of them has 
> worked for me.
> Can anyone point me to some definitive documentation for configuring this in 
> OpenBSD? Or advise as to how to set this up?
> Seems like it should be a pretty basic thing, but I just can"t seem to get it 
> right.
> I didn"t post any sample configs as I"ve tried many (many) different ways to 
> do this today and have removed all of those changes at this point.

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