For some reason unknown to me there is no reboot option in web-based user interface but it doesn’t mean that it cannot be done easily as you just need to use one specific URL parameter.

Using web browser

Navigate to and provide your login credentials.

Using wget

Execute command:

$ wget -O /dev/null -nv --user admin --password 'password'

Using curl

Execute command:

$ curl -o /dev/null -s -u 'admin:password'

28.12.2014 – Update

I was pointed out by Daniel Kämmerling that recent firmware version does not support this functionality anymore, but you can use the following version.