A possible fix for a 'blind' Bonjour

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Dec 10, '09 07:30:04AM • Contributed by: alexandre_hamez

If you happen to not see as many Bonjour devices on your network as you know you should, check that IPV6 is enabled in the Network System Preferences panel (on the Advanced tab).

I don't know why, but it seems that Bonjour needs IPv6 to discover the whole network.

[robg adds: This is the first I've heard of this, and I can't really test it, as I have only a couple Bonjour-enabled devices, and they both show up regardless of whether IPv6 is enabled or not.]

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A possible fix for a 'blind' Bonjour
Authored by: Storm608 on Dec 10, '09 08:06:42AM

I used to use the bonjour server for syncing my iPod Touch "Files" app and for some reason it stopped working a while back and when I tried to connect to the server I kept getting an error message.

I checked the IPv6 setting in my Network Preferences and it was turned off. When I enabled it, and tried to connect to the Bonjour server, it was working again.

Thanks for the hint.

A possible fix for a 'blind' Bonjour
Authored by: David Balogh on Dec 10, '09 06:17:18PM

It may be that the other devices are broadcasting BonJour only over ipv6 or preferring ipv6. With it turned off, your device may have trouble seeing them. I'd be curious to know if the devices showed up after a few minutes, or perhaps when another device joined the network, causing a flurry of announcements and responses.

A possible fix for a 'blind' Bonjour
Authored by: snoop on Dec 10, '09 07:29:39PM

The problem is likely caused by your router blocking IPv4 multicast, but not IPv6 multicast. For a while, Linksys was shipping most home routers with the "multicast filter" checkbox logic reversed, such that turning on multicast filtering would actually enable multicast, and disabling filtering would disable multicast. Maybe that's your problem. Try disabling "multicast filter".

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