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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.

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What does your routing table look like, before and after? –  Ignacio Vazquez-Abrams Mar 25 '12 at 22:14
    
How would I find that? –  JW. Mar 25 '12 at 22:37
    
Run netstat -rn. Obscure any sensitive addresses. –  Ignacio Vazquez-Abrams Mar 25 '12 at 22:38
    
If I do that before and after connecting to the VPN, the results are the same, other than some of the numbers under "Refs", "Use", and "Expire". Here's the result: pastebin.com/QZUYUFYz –  JW. Mar 25 '12 at 22:42
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