Set up the RaspiBlitz for remote connections with ZeroTier

ZeroTier is a VPN service which is an easy option to connect remotely when neither port forwarding nor using Tor is possible (e.g. iOS on a remote network)

The drawback is that it requires installing a trusted (open-source) package which gives access to your private network.

Steps to install:

Create a my.zerotier.com account and a network
Go to https://my.zerotier.com/login and register. Use a STRONG PASSWORD as anyone with your credentials will have access to your private network.
Click Create a network then record your Network ID.

Install ZeroTier on the RaspiBlitz (more details on https://www.zerotier.com/download.shtml):

$ curl -s 'https://raw.githubusercontent.com/zerotier/ZeroTierOne/master/doc/contact%40zerotier.com.gpg' | gpg --import && \
if z=$(curl -s 'https://install.zerotier.com/' | gpg); then echo "$z" | sudo bash; fi

Then run:

$ sudo zerotier-cli join [the network ID you previously recorded]
Install ZeroTier on your other devices: iOS, Android, Windows, Mac, Linux, etc. Use the same network ID you recorded before.
Open https://my.zerotier.com Networks menu and accept the new devices pending approval.
On the Raspiblitz modify the lnd.conf manually:
$ sudo nano /mnt/hdd/lnd/lnd.conf

add the line:
```
  tlsextraip=172.X
```
CTRL+O and ENTER to save, CTRL+X to exit

Restart LND and unlock:
$ sudo systemctl restart lnd
$ lncli unlock
Renew the TLS certificates either from the EXPORT menu or run:
$ ./config.scripts/lnd.tlscert.sh

After setting up and activating ZeroTier on my Android phone successfully tested:

ZeusLN using the IP 172.x.x.x and port 8080
RTL from the outside on my 172.x.x.x:3000 address
Termius to connect with ssh to admin@172.x.x.x

To uninstall run:

  $ sudo systemctl stop zerotier-one
  $ sudo apt remove zerotier-one
  $ sudo rm -r /var/lib/zerotier-one

This guide is based on: https://medium.com/@ketominer/using-nodl-remotely-with-zerotier-a9a17cbb48cf

Discussion: https://github.com/rootzoll/raspiblitz/issues/601

Set up the RaspiBlitz for remote connections with ZeroTier

Termius to connect with ssh to admin@172.x.x.x