Navigate to System –> Advanced –> Networking:

• Allow IPv6: Not checked.
• Prefer IPv4 over IPv6: Checked.

Navigate to Services –> DHCPv6 Relay:

• *Not Checked. —- ===== Interfaces ===== Disable IPv6 on each of the interfaces: ==== WAN ==== Navigate to Interfaces –> WAN (pppoe0). * In General Configuration: * IPv6 Configuration Type: None. ==== LAN ==== Navigate to Interfaces –> LAN (em1). * In General Configuration: * IPv6 Configuration Type: None. ==== OTHER INTERFACES ==== * Repeat for all other interfaces that this applies to. —- ===== Gateways ===== Navigate to System –> Routing –> Gateways –> Default Gateway. * Default gateway IPv6: None. —- ===== Firewall Rules ===== Firewall rules to block IPv6.

  NOTE: This is not necessarily needed, but a precaution if something is not working or gets misconfigured.

  Navigate to Firewall –> Rules –> LAN. * Default allow LAN IPv6 to any rule: Disable.

  NOTE: Do not delete the IPv6 rule, as you may want it for later.