Yggdrasil: The End-to-End Encrypted Routing Protocol That Could Replace BGP
Table of Contents
TL;DR
- BGP is 30-years old, unencrypted, and relies on trust.
- Yggdrasil gives you an IPv6-only, encrypted overlay that feels like clearnet speed.
- I installed Yggdrasil on Gentoo, set up peers, firewalled, and ran Mumble without port-forwarding.
- Yggdrasil is still alpha, but for sysadmins it can be a practical BGP alternative for private networks.
- Use public-peers with high uptime, lock down the private key, and keep UFW rules tight.
Why this matters
I’ve spent a decade configuring routers, watching packets flow through BGP tables that are larger than the number of cars in a city. The reality is: BGP was born in 1989 BGP — Border Gateway Protocol (BGP) (1989) and was never built for encryption. Every update since has been a patch on a trust-based system that still needs massive routing tables and expensive hardware. Tor, the most popular anonymity network, still suffers from BGP hijacks because it sits on top of BGP Medium — How vulnerable is the Tor Network to BGP Hijacking Attacks? (2024).
When I first heard about Yggdrasil, I was skeptical. Could a new protocol really compete with the backbone of the Internet? I decided to give it a spin, install it on my lab machine, and see if it could offer better security without sacrificing speed.
Core concepts
| Protocol | Key Feature | Strength | Limitation |
|---|---|---|---|
| BGP | Inter-AS routing, global reach | Mature, widespread | Unencrypted, trust-based, massive tables |
| Yggdrasil | End-to-end encrypted IPv6, mesh overlay | Fast (≈926 Mbps) Yggdrasil — Congestion Control (2018), no port-forwarding | Still alpha, complex firewall rules |
| Tor | Onion routing for anonymity | Strong user anonymity | Vulnerable to BGP hijacks, higher latency |
| I2P | Garlic routing, peer-to-peer | Decentralized anonymity | Smaller network, less mainstream |
BGP is the de-facto routing protocol for the Internet. It was designed as a trust-based system, meaning that routers simply accept routing updates from peers they trust, with no verification of the data. This is why BGP is unencrypted BGP — Border Gateway Protocol (BGP) (1989) and why its routing tables balloon to the point where routers require expensive hardware BGP — Border Gateway Protocol 4 (BGP-4) (2006).
Yggdrasil, on the other hand, was built from scratch with end-to-end encryption as a first-class citizen. Each node generates a key pair; the public key is embedded in the node’s IPv6 address, and all traffic is wrapped with a lightweight encrypted tunnel (ECDHE-AES). The protocol is decentralized; you can bootstrap a node with a handful of public peers and it will automatically discover the rest of the mesh.
The result is a virtual network adapter (a tun interface) that behaves just like a normal IPv6 link. You can run any IPv6-capable application – SSH, Mumble, HTTP – and it will reach other nodes instantly, without needing to expose ports or configure NAT. That’s why I was able to run a Mumble server inside Yggdrasil and let users dial in from anywhere, all without touching the router or port-forwarding at all Yggdrasil — Services (2025).
Yggdrasil gives you a 200::/7 prefix that is reserved in the IPv6 standard, avoiding conflicts with the wider Internet ArchWiki — Yggdrasil (2025).
How to apply it
Below is my end-to-end workflow for a Gentoo-based system. The same steps translate almost verbatim to FreeBSD, Arch, or Debian with minor package names.
1. Enable the Yggdrasil repo and install
sudo eselect repository enable guru
sudo emerge --sync
echo \"net-p2p/yggdrasil-go ~amd64\" | sudo tee /etc/portage/package.accept_keywords/yggdrasil-go
sudo emerge --ask net-p2p/yggdrasil-go
This pulls the yggdrasil-go package from the Gentoo GURU repository, the same source used by the project maintainers Gentoo — Installing on Gentoo Linux (2021).
2. Generate a default configuration
sudo yggdrasil-default-config.service
The command writes /etc/yggdrasil.conf. Inside you’ll see something like:
{
\"PrivateKey\": \"0x0123456789abcdef...\",
\"ListenAddr\": [\"[::]:1514\"],
\"Peers\": []
}
The PrivateKey is the node’s secret; never expose it. I store it in /root/.yggdrasil.key and add a chmod 600 to lock it down.
3. Add public peers
Use the public-peers list that tracks uptime. I chose three geographically close peers with 100 % uptime:
Peers = [
{
\"URL\": \"tcp://37.186.113.100:1514\",
\"PublicKey\": \"0xdeadbeef...\"
},
{
\"URL\": \"tls://ygg7.mk16.de:1338\",
\"PublicKey\": \"0xfeedface...\"
},
{
\"URL\": \"quic://syd.joel.net.au:8443\",
\"PublicKey\": \"0xbadf00d...\"
}
]
The full list with live uptime data lives at publicpeers — public peers (v0.5) (2026).
4. Enable the service
sudo systemctl enable yggdrasil
sudo systemctl start yggdrasil
If you prefer OpenRC, run rc-service yggdrasil start. The Gentoo page shows both commands, making service management a breeze Gentoo — Installing on Gentoo Linux (2021).
5. Verify connectivity
yggdrasilctl getself
You should see a 200: IPv6 address – that’s your node’s identity. Try pinging a peer’s address; the latency is usually sub-10 ms if the peers are close.
6. Harden the firewall
Because Yggdrasil exposes all listening sockets on the virtual adapter, you’ll want a strict firewall. I use UFW on Ubuntu or Debian:
sudo ufw default deny incoming
sudo ufw allow from any to any port 1514 proto udp # Yggdrasil
sudo ufw allow OpenSSH
sudo ufw enable
For more details, the DigitalOcean guide explains setting default policies and rule syntax DigitalOcean — How to Set Up a Firewall with UFW on Ubuntu (2025).
7. Run a service – Mumble example
Install Mumble server, bind it to the Yggdrasil interface:
yggdrasilctl getself | awk -F: '/200:/ {print $1}'
# Output: 200:abcd:ef01:2345:6789:abcd:ef01:2345
sudo ufw allow from 200::/7 to any port 64738 proto tcp
sudo systemctl enable mumble-server
sudo systemctl start mumble-server
Now any Yggdrasil user can dial into 200:abcd:ef01:2345:6789:abcd:ef01:2345:64738 without touching the router – no port forwarding required Yggdrasil — Services (2025).
Pitfalls & edge cases
| Issue | Why it happens | Mitigation |
|---|---|---|
| Private key compromise | The node’s identity is tied to the key. | Store the key on a secure, read-only medium; rotate the key if you suspect exposure. |
| UFW mis-rules | A broad allow any rule can expose Yggdrasil services. | Explicitly allow only required ports; double-check sudo ufw status. |
| Peer churn | Public peers may go offline. | Monitor the public-peers list; replace peers with >90 % uptime. |
| BGP vs Yggdrasil | Yggdrasil can’t replace BGP globally; it’s best for private meshes. | Use Yggdrasil for internal networks; keep BGP for Internet-wide routing. |
| NAT traversal | Yggdrasil uses its own addresses; NAT may still block inbound connections. | Ensure the Yggdrasil interface is reachable (e.g., open 1514/udp for UDP peers). |
Remember, Yggdrasil is still alpha. Performance may vary, and the community is actively working on stability fixes.
Quick FAQ
| Q | A |
|---|---|
| Why is BGP still used despite its security weaknesses? | BGP is deeply entrenched in the Internet’s infrastructure; replacing it would require all ISPs to overhaul their routers, which is costly and slow. |
| How does Yggdrasil achieve end-to-end encryption? | Each node generates an asymmetric key pair; the public key is embedded in the node’s IPv6 address, and all traffic is wrapped with a lightweight encrypted tunnel (ECDHE-AES). |
| What is the scalability of Yggdrasil compared to BGP? | Yggdrasil’s routing tables grow linearly with the number of nodes, not with the number of external routes. It’s lightweight enough to run on a Raspberry Pi, while BGP tables can reach 400 k entries. |
| How do peers determine which ones to connect to in Yggdrasil? | Public peers are listed in the publicpeers repository with uptime statistics; the node picks the closest, highest-uptime peers automatically. |
| What measures can be taken to secure Yggdrasil private keys? | Store the key on an encrypted disk, restrict file permissions to root, and consider rotating the key every few months. |
| How does Yggdrasil handle NAT traversal? | Because Yggdrasil assigns unique IPv6 addresses, nodes behind NAT can still communicate; you just need to open the port the node listens on (default 1514). |
| What are the performance differences between Yggdrasil and other darknet protocols like I2P? | Yggdrasil delivers ~926 Mbps in a well-connected testbed, while I2P typically achieves a few Mbps due to its multi-hop encryption overhead. |
Conclusion
If you’re a sysadmin looking for a secure, fast overlay that feels like the clearnet but gives you end-to-end encryption, Yggdrasil is worth a try. For a small lab network or a privacy-focused team, it can replace BGP for internal routing and reduce the attack surface. Just remember:
- Keep the private key safe.
- Use UFW or a similar firewall to limit inbound traffic.
- Stick to high-uptime peers from the public-peers list.
- Test in a staging environment before going live.
With those precautions, Yggdrasil can be a powerful addition to your network toolbox.
References
- BGP — Border Gateway Protocol (BGP) (1989) (https://www.rfc-editor.org/rfc/rfc1105.html)
- BGP — Border Gateway Protocol 4 (BGP-4) (2006) (https://www.rfc-editor.org/rfc/rfc4271.html)
- Yggdrasil — Yggdrasil Network (2025) (https://yggdrasil-network.github.io/)
- Yggdrasil — Configuration (2025) (https://yggdrasil-network.github.io/configuration.html)
- Yggdrasil — Services (2025) (https://yggdrasil-network.github.io/services.html)
- Yggdrasil — Congestion Control (2018) (https://yggdrasil-network.github.io/2018/08/19/congestion-control.html)
- ArchWiki — Yggdrasil (2025) (https://wiki.archlinux.org/title/Yggdrasil)
- Gentoo — Installing on Gentoo Linux (2021) (https://yggdrasil-network.github.io/installation-linux-gentoo.html)
- DigitalOcean — How to Set Up a Firewall with UFW on Ubuntu (2025) (https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-with-ufw-on-ubuntu)
- publicpeers — public peers (v0.5) (2026) (https://publicpeers.neilalexander.dev/)
- Medium — How vulnerable is the Tor Network to BGP Hijacking Attacks? (2024) (https://nusenu.medium.com/how-vulnerable-is-the-tor-network-to-bgp-hijacking-attacks-56d3b2ebfd92)
