Synology NAS SSH

Dear All

I have a DS414 Synology device which I am backing up to another on another site over the WAN. I have to open the SSH port 22 but  I now  seem to be having attack attempts as the deice is blocking IP's  This port can be changed but it seems that some would say that this inst necessary but synology suggest themselves to change the HHTP and HTTPS default ports and would have though that this would be the same for SSH.  

Please can you advice me as I know I need offiste backup but I don't want my data to be unsecured, I have breadth taken steps to put a HHTPS certificate in.
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Changing port numbers are most easily done on the router where you input the NAT routing settings (you set it up as public IP port 22 to internal IP port 22). Just change the settings to public IP port 2222 to internal port 22, and you have changed the SSH port for the outside without ever touching the Synology. Internal use is still port 22. External use is the same, except in the SSH client software, you change default port to 2222

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AJ1978Author Commented:
HI - I sort of follow what you are saying but could you assist further?  I am using Asus router AUC68U, any chance you could give me a step by step guide?
Assuming you meant the Asus RT-AC68U:

menu WAN > tab Virtual server / Port forwarding > 
Servicename: SSH
Port range: 22222
Local IP: (select the NAS IP)
Local port: 22
press the + sign to add it. Configuration should already be active now. Save configuration file on your computer for if you ever screw up the settings.

If you're not OUTSIDE your home, use public_IP and port 22222 to connect to your NAS.
Inside your home network, keep using port 22 to connect.
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AJ1978Author Commented:
Done but then that stop the site to site backup, I also checked to see if I could see the port open nut its says no using
Site to site backup has to have some configuration where you change port 22 to 22222. If there are no backup settings to change, changing port numbers isn't an option.
AJ1978Author Commented:
Okay let me check on the NAS, thanks for your help.
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