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Ungleich IPv6 wireguard VPN » History » Version 9

Nico Schottelius, 06/23/2021 08:43 PM

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h1. Ungleich IPv6 wireguard VPN
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{{toc}}
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*%{color:green}This document only concerns VPN clients and is intended for end-users/customers. See [[The ungleich VPN infrastructure]] page for server-side documentation.%*
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h2. Status
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This document is *IN PRODUCTION*.
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h2. How to get VPN
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* If you are a VM users of DataCenterLight, you get it for free
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* Otherwise you can book it at https://IPv6VPN.ch
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* In both cases, send a request to support at ungleich.ch
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Technically, the following steps are necessary:
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<pre>
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1. Install Wireguard
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 https://www.wireguard.com/install/
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2. Create your private key:
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 umask 077; wg genkey > privkey
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3. Get your public key
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  wg pubkey < privkey
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4. Send us the pubkey
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</pre>
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If you want to be fast, you can already take these steps before contacting support.
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h2. Security of IPv6 vs. NAT
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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.
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h2. Proxy all traffic (IPv6 + NAT64 for IPv4) via the VPN
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It is possible to forward (almost) all traffic to the ungleich VPN by using our DNS64 resolvers. You can do so by configuring 2a0a:e5c0:2:12:0:f0ff:fea9:c451 (unbound1.place6.ungleich.ch) and 2a0a:e5c0:2:12:0:f0ff:fea9:c45d (unbound2.place6.ungleich.ch) as DNS servers when connected to the VPN.
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It will:
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* Use those two servers (via the VPN) for "DNS":https://en.wikipedia.org/wiki/Domain_Name_System traffic.
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* Route all traffic to domain names (resolved by any of the two DNS servers) via the VPN.
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It won't:
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* Route traffic to specific IP addresses (= bypassing DNS) via the VPN.
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* Route traffic from application using their own DNS resolving system (e.g. Firefox with DNS-over-HTTPS enabled)
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* Route IPv4 traffic
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*Complete isolation* can be achieved using network namespaces, as "described on wireguard's documentation":https://www.wireguard.com/netns/#the-new-namespace-solution.
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h3. Setup instruction
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It's dead-simple! You only have to add the following lines to the @[Interface]@ section (just below (@ListenPort = 51280@) of your wireguard configuration:
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<pre>
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DNS = 2a0a:e5c0:2:12:0:f0ff:fea9:c451
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DNS = 2a0a:e5c0:2:12:0:f0ff:fea9:c45d
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</pre>
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h2. Wireguard VPN on vpn-2a0ae5c1.ungleich.ch
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* Server: vpn-2a0ae5c1.ungleich.ch
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* Port: 51820
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* Requires a public key
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* Client network: 2a0a:e5c1:100::/40
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* Client network size: /48
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h3. Sample clustomer client configuration
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* "Install wireguard":https://www.wireguard.com/install/
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* Create your private key: @umask 077; wg genkey > privkey@
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* Get your public key: @wg pubkey < privkey@
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** You need to send this pubkey to ungleich
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* You will get your network definition after we have received your public key
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* Create /etc/wireguard/wg0.conf
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<pre>
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[Interface]
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PrivateKey = YOURKEYHERE
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Address = YOURIPv6IPADDRESSHERE/48
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ListenPort = 51280
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[Peer]
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PublicKey = hi60lGP+xEUQ+kVnqA7PlJAO1SVqTS1W36g0LhFP0xQ=
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Endpoint = vpn-2a0ae5c1.ungleich.ch:51820
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AllowedIPs = ::/0
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</pre>
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* *ONLY change* the PrivateKey and the Address entries.
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* *ALL other entries* (especially PublicKey, Endpoint and AllowedIPs) need to *stay as is*
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h3. How to setup the VPN (the easy way)
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Once you have created the configuration, you can simply call
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<pre>
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wg-quick up wg0
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</pre>
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And to stop the VPN, you can use
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<pre>
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wg-quick down wg0
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</pre>
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h3. How to setup the VPN (the manual way)
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Commands for setting it up
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<pre>
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MY_NET=2a0a:e5c1:XXXX::1/48
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ip link add dev wg0 type wireguard
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# Replace with your range
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ip addr add $MY_NET dev wg0
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# Add routing
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ip route add 2a0a:e5c1::/32 dev wg0
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ip route add ::/0 via 2a0a:e5c1:100::1
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# Configure the interface
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wg setconf wg0 /etc/wireguard/wg0.conf
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# Bring it up
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ip link set wg0 up
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</pre>
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h3. About usable IPv6 addresses
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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.
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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
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are supposed to answer on this address.
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In other words, in your wg0.conf use:
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<pre>
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[Interface]
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...
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Address = 2a0a:e5c1:101::42/48
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</pre>
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Do *NOT* use:
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<pre>
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[Interface]
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...
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# Don't use this
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Address = 2a0a:e5c1:101::/48
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</pre>
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h3. How to debug
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* wg show # Show configuration
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* ping 2a0a:e5c1:100::1 # Try to ping the gateway
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If you want to send us your configuration, you should remove your private key from wg0.conf.
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Under Linux/BSD/MacOS you can do that as follows:
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<pre>
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cat /etc/wireguard/wg0.conf  | sed 's/\(PrivateKey =\).*/\1 MYPRIVATEKEY/'
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</pre>
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The result could look as follows:
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<pre>
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root@line:~# cat /etc/wireguard/wg0.conf  | sed 's/\(PrivateKey =\).*/\1 MYPRIVATEKEY/'
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[Interface]
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PrivateKey = MYPRIVATEKEY
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ListenPort = 51280
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Address = 2a0a:e5c1:101::42/48
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#DNS = 2a0a:e5c0::3, 2a0a:e5c0::4
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[Peer]
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PublicKey = hi60lGP+xEUQ+kVnqA7PlJAO1SVqTS1W36g0LhFP0xQ=
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Endpoint = vpn-2a0ae5c1.ungleich.ch:51820
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AllowedIPs = ::/0
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</pre>
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h3. How to config wireguard on mobile phone(android / ios)
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<pre>
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You should fill out DNS field.
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ex) for ipv6 DNS ==> 2a0a:e5c0::3 or 2a0a:e5c0::4
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and you should assgin phone own IP.
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ex) laptop Address = 2a0a:e5c1:101::42/48
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    phone Address = 2a0a:e5c1:101::43/48
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another things are same as client's configutaion.
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</pre>
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h3. How to config IPv6 DNS on wireguard(if it can't find DNS)
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<pre>
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You should fill out DNS field.
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ex) for ipv6 DNS ==> 2a0a:e5c0:2:12:0:f0ff:fea9:c451 or 2a0a:e5c0:2:12:0:f0ff:fea9:c45d
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DNS = 2a0a:e5c0:2:12:0:f0ff:fea9:c451
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</pre>
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h3. How to config wireguard manually on Mac OS without APP(for using IPv4 and IPv6 at the same time) 
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<pre>
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1) install wireguard on macOS
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- brew install wireguard-tools
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2)find wireguard install location
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- cd /usr/local/etc/wireguard
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3) create wg0.conf in wireguard location(refer to above)
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4) run wireguard
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- wg-quick up  wg0
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</pre>
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h2. ungleich VPN types and configuration
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This guide is for internal handling, but also publicly available to allow knowledge sharing.
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h3. Type 1, classic IPv6-VPN
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* We route a /48 into the tunnel, the pool is usually a /40 or bigger
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* Most VPN servers at ungleich operate like this
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Pro/Con:
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* Very easy setup
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* Not much knowledge required
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* Single stack
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h3. Type 2, IPv6-VPN with mapped IPv4
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* We route a /48 into the tunnel, the pool is usually a /40 or bigger
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* Additionally IPv4 connectivity is provided via NAT64
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** One or more IPv6 addresses are mapped to IPv4 addresses
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** The client devices see IPv6 traffic
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* Outgoing IPv4 mapping can be achieved, if the correct NAT64 network is targetted
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** Can be configured using DNS64
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Pro/Con:
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* More tailored to clean IPv6 environments
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* Target networks stay IPv6 only
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* Needs more knowledge from operator
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* Needs additional configuration on ungleich side
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* Port forwarding setups on the router are non-trivial
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** Needs NAT64 on the router if IPv4 devices should be targetted
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h3. Type 3, IPv4 only VPN
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* We route 1 (or more) IPv4 addresses into the tunnel
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Pro/Con:
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* The client can configure port forwarding
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* No support for new technology/IPv6
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* Solves IPv4 only use cases trivially
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h3. Type 4, IPv6-VPN with native IPv4
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* We route a /48 into the tunnel, the pool is usually a /40 or bigger
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* We route 1 (or more) IPv4 addresses into the tunnel
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Pro/Con:
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* The client can configure port forwarding
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* Support for new technology/IPv6 automatically
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* Solves IPv4 only use cases trivially
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h2. OpenVPN on openvpn.ungleich.ch
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* Server: openvpn.ungleich.ch
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* Port: 1195
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* Requires a certificate
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* Address range: 2a0a:e5c0:3::/48
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** Client networks are /64
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*END OF LIFE by 2019-06-30*