[p2p-hackers] couple of questions...

[Saikat Guha]

On Tue, 2005-11-01 at 13:29 -0800, Lemon Obrien wrote:
> 2. when keeping the firewall hole open between two computers by
> ping/pong them; does the router keep the hole open for the recieving
> (pong'd) computer, thus eliminating the need for it to pong the
> computer which just ping'd it? I would think so...but want to know for
> sure.

In general, one cannot rely on incoming UDP traffic to keep the hole
open in the absence of outgoing traffic; a number of security-conscious
NATs will close the hole. The only reliable way to keep the hole open is
to use both "ping/pong", as you do, and not just "pings".

cheers,
-- 
Saikat
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