Fuck the Windows ipconfig command

I just spent 3 hours troubleshooting my brand new homelab build trying to find out why my OpenWRT router was still advertising itself as an IPv6 DNS server after disabling dnsmasq and the dhcp server in Luci.

I did everything to try and figure out why it was still broadcasting that IPv6 router advertisement (RA) and breaking nslookup on all of my clients. I disabled and reenabled my DNS/DHCP server multiple times, uninstalled odhcpd and dnsmasq on the router, tried deleting the dhcp config files on the OpenWRT router. I pretty much rebuilt the entire network stack.

3 hours of agony only to find that when you use ipconfig /release; ipconfig /renew on Windows, it doesn't release any IPv6 assignments or any IPv6 router assignments such as IPv6 DNS RAs.

You have to run ipconfig /release6; ipconfig /renew6 separately.

FML