Use ProxyJump

Reference

https://www.madboa.com/blog/2017/11/02/ssh-proxyjump/

How to use ProxyJump to connect or scp through Bastion Host

For example:

# ~/.ssh/config
Host *
  ForwardAgent yes
  
Host bastion
  Hostname public.domain.com
  User alex
  Port 50482
  IdentityFile ~/.ssh/id_ed25519
  
Host lanserver
  Hostname 192.168.1.1
  User alex
  ProxyJump bastion