Ragnor: Bonjour is just Apple-speak for NAT-PMP, look for an option in your Belkin related to that. Often UPNP and NAT-PMP come disabled by default in many routers.
Sometimes enabling UPNP in some routers will actually enable UPNP and NAT-PMP (aka Bonjour).
Thanks for the info. I can't find any mention of NAT-PMP, and UPNP is already enabled.