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ssh on wan port after install

Context

I installed an openWRT system, I want to connect to SSH on it.
After a fresh install only telnet is available.
One could always use telnet through the wan interface, but it's not a good choice

Dropbear

Dropbear is the lightweight SSH server for the situation.
It's installed by default, we just have to configure it

Allow TCP port 22 from wan (/etc/config/firewall)

The default behaviour is to REJECT any INPUT from wan:
config zone
option name  wan   option input    REJECT 
  option output   ACCEPT 
  option forward  REJECT 
  option masq     1 
  option mtu_fix  1
That is the POLICY (default behaviour).
We are going to add a specific "rule" to allow TCP/22
         config rule 
option src              wan 
option proto            tcp 
option dest_port        22 
option target           ACCEPT 
option family   ipv4
Don't forget to setup a password for root, and we're done!

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