Setting DNS names via Flint2

[will.qiu]

Due to duplication, merged into

How to enable pinging by hostname

This has been a capability of all my previous routers (? I think), that if I name the devices on the router, I can then ping them by that name, (ie if I run >ping media, where I have set media = 192.168.0.xx in the router, and it is also included in the hosts file) but this does not appear to be the case with the Flint2? Where am I going wrong? Tips for enabling this? Thanks.