In that case I suggest poking around using the WebUI > System > CLI (command line interface) to get familiar with the concept and file structure before attempting to ssh from a separate laptop / linux terminal etc. etc.
Basically:
login: root
Password: YourRouterPassword
root@Teltonika-RUTX:~# <- when you see this you can start typing commands
cd /overlay/upper/etc/config <- changes the current directory to /whatever/you/type
ls -l <- list everything in the current directory
cat dhcp <- show me the contents of the file named 'dhcp' (cannot edit, just view)
vi dhcp <- edit the file named 'dhcp' using 'vi' (see https://www.redhat.com/sysadmin/introduction-vi-editor)
Learning how to use vi is a necessary hassle as it's the only command line file editor built into Teltonika devices. If you have a Mac or Linux machine you might have seen a file editor called nano, similar idea just implemented differently, the redhat link above will get you started. To make things even more complicated, the version of vi installed on Teltonika devices is not the full version... Some functions will not work. The 'missing' functions are outlined here https://en.wikibooks.org/wiki/Learning_the_vi_Editor/BusyBox_vi
The simplest explanation is that vi has an 'editing / typing' mode and a 'menu / do stuff' mode. You need to be in the right mode before typing anything otherwise it's a comedy show.
When you're confident looking around in CLI, hit me back. **WARNING** you can do some serious damage to your router if you start modifying files and directories without really knowing what you're doing ... to the point that a factory reset might not even be possible? So be cautious and methodical and make sure you've got a solid understanding of what you're doing, before doing it.
p.s: breaking stuff is how you learn stuff :)
p.p.s: I am not related to Teltonika in any way, so if you prefer to wait for a proper tech support reply, that's up to you :)
