Maintain ssh tunnel

Based on this: https://github.com/daradib/sidedoor

1. installation

sudo apt install sidedoor

2. create ssh public key and add to remote user ~/.ssh/authorized_keys

sudo ssh-keygen -t rsa -N '' -f /home/myaccount/id_rsa
cat /home/myaccount/id_rsa.pub | ssh myaccount@my.remote.server 'cat >> .ssh/authorized_keys'

3. modify /etc/sidedoor/config

Host my.remote.server
  # SSH private key to access the remote server.
  IdentityFile /home/myname/id_rsa

  # because I am using ddns, my IP might change, so I set it to no
  StrictHostKeyChecking no

  # SSH host key of the remote server.
  UserKnownHostsFile /dev/null

  # If tunneled traffic is encrypted (e.g., SSH),
  # it probably does not compress well.
  Compression no

  # Disable password authentication.
  BatchMode yes

  # Terminate if unable to set up port forwarding.
  ExitOnForwardFailure yes

  # Enable SSH keepalives.
  ServerAliveInterval 30

  # Disconnect after unresponsive SSH keepalives.
  ServerAliveCountMax 3

4. modify /etc/default/sidedoor

# Configuration for sidedoor service

# Arguments to pass to sidedoor, which are in turn passed to ssh.
# See man ssh for possible options.
# For example, uncomment the line below to create a remote port forward
# to the local SSH server (running on port 22, exposed on port 8022).
OPTIONS='-R 12345:localhost:9999'

# Remote SSH server to connect to, i.e., [user@]hostname.
REMOTE_SERVER=myaccount@my.remote.server

5. start up sidedoor service and check sidedoor status

sudo systemctl enable sidedoor.service
sudo systemctl restart sidedoor.service
systemctl status sidedoor.service

Raspberry PI wifi mac 重啟後一直改變

想把 raspberry pi wifi 連線成固定某個 IP，
當設定好後發現每次重啟 raspberry pi wifi 的 mac 一直改變。

要修正這部份，可以新增一個檔案 "100-disable-wifi-mac-randomization.conf" 至 /etc/NetworkManager/conf.d
內容如下

[connection]
wifi.mac-address-randomization=1
 
[device]
wifi.scan-rand-mac-address=no

可透過以下指令確認 wifi mac 是否還有一直變動

sudo systemctl restart NetworkManager