IPv6 router forwarding packets along a path

IPv6

This section is about IPv6 in practice: addressing, routing, tunnelling, VPNs, firewall behaviour and the occasional configuration detail that only becomes visible when packets refuse to take the expected path. I document experiments, troubleshooting sessions and working setups from real networks, including the mistakes and workarounds encountered along the way. Expect packet-level details, router configuration, command-line examples and practical notes from running IPv6 in home and cloud environments.

  • Featured image alt text: Isometric network diagram showing a cloud server relaying IPv4 and IPv6 traffic to a home router, Raspberry Pi and VPN endpoint.
    IPv4-to-IPv6 Relay for Home Services Behind CGNAT
    My home network has public IPv6 but no public IPv4 because of CGNAT. This article describes how I use a small Oracle Cloud Free Tier Ubuntu VM, systemd and socat to relay public IPv4 SSH and WireGuard traffic into IPv6-reachable home systems.
  • DOAG 2024 speaker banner for a session about connecting a home office with Oracle Cloud
    Connect Your Home Office to Oracle Cloud – DOAG 2024
    On Tuesday, November 19, 2024, I had the opportunity to speak about Oracle Cloud. Have you ever wondered how to connect your home office to the Oracle Cloud and exchange routes dynamically with BGP? If so, I hope my presentation provided some inspiration. This presentation is a follow-up to my first session at DOAG 2022,
  • Illustration of OSPF route exchange between a cloud router and a home router over a secure WireGuard IPv6 tunnel.
    WireGuard VPN over IPv6 with OSPF on OCI – Part IV
    This post will describe the way to setup a WireGuard site-to-site VPN using IPv6 and OSPF in the Oracle Cloud Free Tier. Part IV is focused on routing and OSPF.
  • WireGuard home router setup over IPv6 with OSPF
    WireGuard VPN over IPv6 with OSPF on OCI – Part III
    This post will describe the way to setup a WireGuard site-to-site VPN using IPv6 and OSPF in the Oracle Cloud Free Tier. Part III is focused on the WireGuard setup and configuration of the home router. In my case it’s an EdgeRouter™-X with version 2.0.9.
  • Router configured for a WireGuard VPN over IPv6 with OSPF
    WireGuard VPN over IPv6 with OSPF on OCI – Part II
    This post will describe the way to setup a WireGuard site-to-site VPN using IPv6 and OSPF in the Oracle Cloud Free Tier. Part II is focused on WireGuard setup and configuration in the cloud.
  • WireGuard VPN over IPv6 with OSPF on Oracle Cloud Free Tier - Part I: OCI Preparation
    WireGuard VPN over IPv6 with OSPF on OCI – Part I
    This post will describe the way to setup a WireGuard site-to-site VPN using IPv6 and OSPF in the Oracle Cloud Free Tier
  • Illustration of a Home LAN client sending traffic for a nonexistent private segment, with the core router dropping it through a local blackhole route.
    It’s not me, it’s you! … Me? No! It’s you! – black hole/null routing
    A practical explanation of blackhole/null routing for home networks, showing how a core router can drop unused private IPv4 destinations locally instead of forwarding them to the default gateway.
  • Illustration of a stale IPv6 static route being removed from a router runtime routing table.
    Delete IPv6 Route on EdgeRouter-X
    How to remove a stale IPv6 static route from an EdgeRouter-X when it has disappeared from the saved configuration but still exists in the Quagga/Zebra routing table.