OpenVPN doesn't work over IPv6

I think I'm getting less and less familiar with ipv6 as it seems.

I've set up the router as described here and here, using almost only the openwrt wiki and the vpn server must most likely be on the lan interface.

I only expect the lan network and the internet to be accessible from the vpn server.

Does push "route-ipv6 2000::/3" mean an IP-range that includes 2001:db8:0:123::/64 for example?