![]() But it also has a lot of weird little edge cases that can bite.įor a Linux host to route via a ZeroTier network, you may (depending on distribution) need to change a setting called rp_filter: You can do almost anything with it, probably including but not limited to IP over avian carrier. ![]() Linux's networking stack is complex and almost absurdly feature-rich. (In the GUI we'll probably prohibit this.) Step 3a: A Linux Gotcha: rp_filter The result of this will depend on your OS but is also not likely to be what you want. If it doesn't work, debug as you normally would with traceroute on your hosts and tcpdump on the gateway.Īvoid enabling allowDefault on more than one network at once. (This is an OS-level behavior we can't change.) On some OSes you may have to restart your web browser and other apps, since OSes differ in terms of whether they apply routing changes to existing sockets and connections or only new ones. Once you've set these options, try hitting and checking your external IP. The Mac and Windows clients have UI to do this. To use default route override you'll have to set allowDefault to true on the network in question. To limit such dangerous network settings we've introduce local network permissions. like take over your Internet connection and route all your traffic through them. But since people do use ZeroTier casually, we wanted to mitigate this risk at least a little bit by requiring user approval for networks to do really invasive things. You shouldn't join networks run by people you don't trust. Joining a network always exposes you to a certain amount of security risk. "Hey, join network # and check out my new site design." It's like actual social networking! (Or social actual networking?) As a result, many of our users really do use it this way. ZeroTier makes joining virtual networks as easy as joining a chat room. Step 3: Allow Default Route Override on Member Devices If you're running your own controller you'll have to do the same via its local JSON API. Obviously you'll want to use your own network's IPs instead of ours. On our net 10.6.4.0/22 is our network and 10.6.6.2 is our virtual edge router's internal IP address (internal to the ZeroTier network). Log into ZeroTier Central and add a route to 0.0.0.0/0 via the IP address of your new virtual edge router. (As we mentioned above IPv6 hasn't been tested yet but we'll update this once we do that.) Here's an example config from a CentOS/Linux gateway that we created for our own ZeroTier company intranet on Digital Ocean:ĭebian and other distributions have their own ways so you'll have to figure that out. Install ZeroTier on your gateway, join your network and authorize it, and then configure it as a basic IPv4 NAT router. (Replace your VPN appliance with a $35 Raspberry Pi?) Alternately you could use a VM or physical box at your own location or anything else that can run ZeroTier and be configured to route IP packets. For most applications their $5/month option is more than adequate since your gateway is not going to need very much RAM, disk, or CPU. Setup here is almost identical to what you'd do to configure a NAT gateway for a conventional wired LAN.Ī simple cloud VPS from Digital Ocean or or similar makes a great low-cost gateway. Just like a real LAN, your imaginary LAN is going to now need a gateway. Default route override means that computers on your imaginary LAN will be routing Internet traffic through it. Step 1: Put an Edge Router on your Imaginary Lan "full tunnel" mode and set up a router/gateway on your virtual network. If you want to route all your Internet traffic through ZeroTier you need to configure it for default route override a.k.a. Normally ZeroTier virtual networks run alongside your normal Internet connection and other networks.
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