The ungleich VPN infrastructure¶

• Table of contents
• The ungleich VPN infrastructure
  • Status
  • Security of IPv6 vs. NAT
  • Wireguard VPN on vpn-2a0ae5c1.ungleich.ch
    • How to add a new customer connection
    • Sample clustomer client configuration
    • How to setup the VPN (the easy way)
    • How to setup the VPN (the manual way)
    • About usable IPv6 addresses
    • How to debug
    • Sample server configuration
  • OpenVPN on openvpn.ungleich.ch

Status¶

This document is IN PRODUCTION.

Security of IPv6 vs. NAT¶

A quick reminder: whether you are using private RFC1918 IPv4 addresses or IPv6 addresses, if you don't want people to access your network, you need to configure a firewall.

Wireguard VPN on vpn-2a0ae5c1.ungleich.ch¶

• Server: vpn-2a0ae5c1.ungleich.ch
• Port: 51820
• Requires a public key
• Client network: 2a0a:e5c1:100::/40
• Client network size: /48

How to add a new customer connection¶

• Get the public key of the customer
• Edit dot-cdist/type/__ungleich_wireguard/manifest and add the new network definition at the end of the file
• Let the customer know their network

Sample clustomer client configuration¶

• Install wireguard
• Create your private key: umask 077; wg genkey > privkey
• Get your public key: wg pubkey < privkey
  • You need to send this pubkey to ungleich
• You will get your network definition after we have received your public key
• Create /etc/wireguard/wg0.conf

[Interface]
PrivateKey = YOURKEYHERE
Address = YOURIPv6IPADDRESSHERE/48
ListenPort = 51280

[Peer]
PublicKey = hi60lGP+xEUQ+kVnqA7PlJAO1SVqTS1W36g0LhFP0xQ=
Endpoint = vpn-2a0ae5c1.ungleich.ch:51820
AllowedIPs = ::/0

How to setup the VPN (the easy way)¶

Once you have created the configuration, you can simply call

wg-quick up wg0

And to stop the VPN, you can use

wg-quick down wg0

How to setup the VPN (the manual way)¶

Commands for setting it up

MY_NET=2a0a:e5c1:XXXX::1/48

ip link add dev wg0 type wireguard

# Replace with your range
ip addr add $MY_NET dev wg0

# Add routing
ip route add 2a0a:e5c1::/32 dev wg0
ip route add ::/0 via 2a0a:e5c1:100::1

# Configure the interface
wg setconf wg0 /etc/wireguard/wg0.conf

# Bring it up
ip link set wg0 up

About usable IPv6 addresses¶

We route a /48 to everyone. Even though technically possible, you should not use the zero address of your network, as it is reserved for reaching all routers.
I.e. if your IPv6 network was 2a0a:e5c1:101::/48, don't use 2a0a:e5c1:101::. The reason for this is that all routers (devices that have ip forwarding enabled) for this network
are supposed to answer on this address.

In other words, in your wg0.conf use:

[Interface]
...
Address = 2a0a:e5c1:101::42/48

Do NOT use:

[Interface]
...
# Don't use this
Address = 2a0a:e5c1:101::/48

How to debug¶

• wg show # Show configuration
• ping 2a0a:e5c1:100::1 # Try to ping the gateway

Sample server configuration¶

This is just for reference - as a client you don't need this configuration

/etc/wireguard/wg0.conf:

[Interface]
ListenPort = 51820
PrivateKey = SERVERKEYHERE

# Nico, 2019-01-23
[Peer]
PublicKey = kL1S/Ipq6NkFf1MAsNRou4b9VoUsnnb4ZxgiBrH0zA8=
AllowedIPs = 2a0a:e5c1:101::/48

# Customer networks below
# ...

Sample server rc.local:

ip link add dev wg0 type wireguard
ip addr add 2a0a:e5c1:100::1/40 dev wg0
wg setconf wg0 /etc/wireguard/wg0.conf
ip link set wg0 up

OpenVPN on openvpn.ungleich.ch¶

• Server: openvpn.ungleich.ch
• Port: 1195
• Requires a certificate
• Address range: 2a0a:e5c0:3::/48
  • Client networks are /64