Gateway Configuration

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Diagnostics Commands

tcpdump -nqi any net 4.2.2.1
ip a | grep 200
# think metric as in "cost" -> higher is lower priority
ip route del default via 192.168.42.1 dev enp0s25
ip route del default via 192.168.42.1 dev enp0s25 metric 700
./build -d # build w/ debug flag
env PPROFLISTEN=localhost:6060 ./yggdrasil -useconffile /etc/yggdrasil/yggdrasil.conf
http://localhost:6060/debug/pprof/
./yggdrasilctl -v getself

Staps To Configure The Gateway

Add 0.0.0.0/0 to IPv4LocalSubnets and enable TunnelRouting in /etc/yggdrasil.conf

TunnelRouting:
{
  # Enable or disable tunnel routing.
  Enable: true
  # IPv4 subnets belonging to this node's end of the tunnels. Only traffic  
  # from these ranges will be tunnelled.
  IPv4LocalSubnets:
  [
    0.0.0.0/0
  ]
}

Restart yggdrasil with systemctl restart yggdrasil.service or service yggdrasil restart

Assign an IP/subnet to the yggdrasil interface (tun0 or ygg0)

ip addr add 10.42.0.1/16 dev tun0

For every node using the gateway, pick an IP address in the previous subnet and inform yggdrasil of the public key of the node to be associated with the chosen IP

yggdrasilctl addremotesubnet subnet=10.42.0.10/32 box_pub_key=<client_public_key>

Finally, add iptables rules to route / forward traffic to the internet. Replace eth0 with the WAN interface of the gateway

iptables -A FORWARD -i eth0 -j ACCEPT
iptables -A FORWARD -o eth0 -j ACCEPT                                                      
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE                                       
echo 1 | tee /proc/sys/net/ipv4/ip_forward

Steps To Connect Your Mesh Node To A Gateway

Add 0.0.0.0/0 to IPv4LocalSubnets and enable TunnelRouting in /etc/yggdrasil.conf

TunnelRouting:
{
  # Enable or disable tunnel routing.
  Enable: true
  # IPv4 subnets belonging to this node's end of the tunnels. Only traffic  
  # from these ranges will be tunnelled.
  IPv4LocalSubnets:
  [
    0.0.0.0/0
  ]
}

Restart yggdrasil with systemctl restart yggdrasil.service or service yggdrasil restart

Add the IP address allocated on the gateway for this node to the yggdrasil interface

ip addr add 10.42.0.10/16 dev ygg0

Inform yggdrasil of the gateway node's public key

yggdrasilctl addremotesubnet subnet=0.0.0.0/0 box_pub_key=<gateway_public_key>

If the client device is connected to WAN, add routes to each yggdrasil peer's IP address to override the default route. Replace <peer_ip> with the IP address of the yggdrasil peer (likely found in yggdrasil.conf), replace <wan_gw> with the IP address of the router or gateway the client device is connected to (likely 192.168.1.1), and replace <wan_dev> with the interface name of the WAN port on the client device. Do this for every peer yggdrasil is configured to use.

ip ro add <peer_ip> via <wan_gw> dev <wan_dev>

Finally, replace the default route with one pointing to the gateway node's tunnel IP

ip ro replace default via 10.42.0.1