On Mon, 30 Nov 2009, Patrick McHardy wrote:

quoted

Where do I find more recent documentation?

Below :)

I found http://lwn.net/Articles/271597/ which mentions that those two
values may be set too strictly. Can they default to zero?

You of course also need to accept the packets marked RELATED by
the helper. If this is missing it might result in one-way audio.

Firewall is configured to accept all udp traffic. Will that do it?

The "helper" is the conntrack module?