I was able to get this work before but I recently moved houses (and ISPs), so had this setup all over again. Here’s my setup.
Cable modem (Motorola Surfboard 5120) --> Switch (dlink)
Airtunes --> Switch
MBWE --> Switch
I can access wifi on my macbook pro so internet is wife and switch is working fine. However, I can’t access MBWE when connected to the switch. Note that I can access it when directly connected to my macbook pro (can login, ssh, see admin page etc.,)/