https://openwrt.org/docs/guide-user/network/ipv6/configuration
wiki and most forum post suggest to use option ipv6 0 to disable ipv6 on wan interface but this does not work with 6rd isp provided tunnel, the tunnel interface still comes up.. luckily i found this post:
and option iface6rd 0 works to temporarily disable isp 6rd, this seems undocumented/hidden, was wondering if @jow or devs took into consideration merging the option with ipv6 0, or if some user with wiki access can provide some info on this option in the ipv6 wiki page. posting this just for reference and ease of search.
thank you.