[p2p-hackers] UDP Keep-alive

Eugen Leitl eugen at leitl.org
Tue Jan 11 21:13:48 UTC 2005

On Tue, Jan 11, 2005 at 01:01:33PM -0800, coderman wrote:

> Most NAT's appear to give a 1-5 minute timeout since last
> packet seen.  It would be nice to find a market summary of
> various NAT behaviors.  Anyone know of such a thing?

Here's a data point: I've spent the better part of the day trying to remove
default NAT (60 sec TCP, 180 sec UDP) idle connection decay from a Draytek
Vigor 2900G with latest firmware.

To no avail, had to send email to support (probably, /dev/null).
Proprietary NAT boxes are evil, period.

Which reminds me (since I've got my IPv6 subnet approved a few days ago):
what's p2p application situation for IPv6? Can anyone give a brief summary?
> The timeout is trivial to avoid with loose UDP NAT (simply
> send / recv a packet from any peer within the few minute
> window).  For symmetric NAT it is more of a pain. Each
> session must send traffic within the timeout window which
> raises overall communication significantly for large numbers
> of logical NAT-UDP connections.

Eugen* Leitl <a href="http://leitl.org">leitl</a>
ICBM: 48.07078, 11.61144            http://www.leitl.org
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http://moleculardevices.org         http://nanomachines.net
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