Does anyone know why a VPN connection might interfere with Apple's Bonjour? I've noticed that my Mac and various iDevices have trouble finding each other on my local network, when I have VPN connections open. Things like Home Sharing and Wi-Fi Sync work some of the time, but sometimes fail to find the other device.
The VPN connections are made using IPSecuritas, which is a GUI around raccoon. I have the local "endpoint mode" set to Host.
Apple mentions that Home Sharing may conflict with VPNs, but they don't specify why, or how to fix it.
I'm using a Mac with OS 10.7.3 and IPSecuritas to connect to the VPN, an iPhone, and an iPad.