Find out the name of the reMarkable interface, by running this command:
$ ip link
If you don't know your other connection names, run the command, then plug the reMarkable into the computer and run the command again, it should be the new connection that shows up
Install dhclient if you don't have it
$ pacman -S dhclient
Now, finally run dhclient in the reMarkable interface:
# dhclient enp0s20u2c2 # This is an example, replace the enp0s20u2c2 with yours
Now go to: http://10.11.99.1/
Good to know that it's working for you @japhir. Next time I'll try without dhclient and see if it works for me :), thanks for letting me know!