The internet router is a residential model from Vodafone. It seems to do the following

  • Supports IPv6, including

    • full support for outgoing IPv6 connections
    • stateless address autoconfiguration (SLAAC)

  • Allows IPv4 incoming connections only.

    • By default, blocks all incoming connections (IPv4 only).
    • Opens individual ports forwarded to specified host:port (standard NAT stuff, IPv4 only).
    • Can set up a DMZ server, where all other incoming connections are routed to a single host (IPv4 only).
    • No way to configure IPv6 incoming connections.

  • It seems fairly reliable, but something drops out periodically.

    • The router itself
    • The far-end of the fibre connection
    • The local Wi-Fi extender (TP Link Deco system)

Setup

  • Ensure that IPv4 address remains fixed: requested from Vodafone, $5 per month

  • Ensure that IPv6 address remains fixed; might happen at the same time

  • Port configuration details

    • Leave the standard port-forwards as they are
    • Set up DMZ pointing to new server
    • Ensure that new server has firewall (ufw) enabled and stopping as much as possible