Synology router “RT1900ac” – my christmas toy

[2015-12-20 00:27:39] johayek@Hayek001 $ ssh

BusyBox v1.16.1 (2015-10-29 15:37:59 CST) built-in shell (ash)
Enter 'help' for a list of built-in commands.

SynologyRouter> ./config.guess
SynologyRouter> ./config.guessJHn 
=config.guessJHn,0: $config_unique=>{synology_northstarplus_rt1900ac},$config_buildnumber=>{5781},$config_smallfixnumber=>{2} // ...

Alright … – it’s a Busybox.

ssh-ing into the admin and (better!!!) root account works almost instantly. Use the GUI password for this purpose!

How to enable SSH access for user accounts? Log in as root; within /etc/passwd change the default shell entries of the resp. user accounts from /sbin/nologin to /bin/ash. (I created a separate article on that on this blog.)

I had an old 4GB SD card, that I inserted, and apart from that it seems to have internal 2GB disk volume space. I also attached an old external disk through USB to this device. More on that in my separate NFS article.

My ds115j has a compatible CPU (almost?!?), so I can borrow (extra) utilities from it:

  • rsync – as opposed to the “tainted” rsync that Synology provides
  • less – as opposed to poor old more

For my 1st steps I attached its WAN port as a client to my VDSL router. Good for updating, good for getting acquainted with its features.

I disconnected that cable, and I attached these sticks / dongles successfully:

Here is Synology’s “3G/4G Dongle” compatibility list:


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