Good evening in the Manjaro community.
I have a broadband connection, via cable, on my computer and eventually it gets slow, I end up having to turn off the modem and restart the machine, so that the speed improves a little.
I would like to know if there is any Terminal command that I can run to reset my connection, in order to renew it in hopes that it gets faster.
Something similar to “flushdns” and the like
If you use Network Manager you can simply:
nmcli networking off ; nmcli networking on
Please don’t - I’m downloading something at the moment and need the internet up and running 
Sorry, I know this is meant to be a pure support forum, but I just can’t resist with this thread’s title 
:
THERE’S JUST ONE INTERNET OUT THERE PLEASE DON’T BREAK IT !!! 
Like thid. This is how you reset the 'net:
I liked the various answers on restarting the internet! 
Seriously though:
If your broadband connection gets slower over time
and this is remedied by restarting the broadband modem
(by switching it off and on again - so that it may acquire a different connection/IP)
there is nothing you can do on the other side of that modem
as you can not force it to reconnect just by disconnecting and reconnecting any client (your computer).
If what @Tomek said helps - it’s likely not an issue with your modem
but with your client (your Manjaro computer).
as of now - it’s unclear what seems to help and what doesn’t
It could be just your provider, slowing you down over time …
One way may be
systemctl restart NetworkManager
(though that can depend on other services, or whether your network card is extra finnicky)