[p2p-hackers] Why UDP and not TCP?

David Barrett dbarrett at quinthar.com
Wed Dec 1 01:17:29 UTC 2004

> -----Original Message-----
> From: Justin Chapweske
> Sent: Tuesday, November 30, 2004 6:01 PM
> To: Peer-to-peer development.
> Subject: RE: [p2p-hackers] Why UDP and not TCP?
> > I'm no firewall nor security expert, but I was under the impression a
> > typical corporate firewall blocks most TCP ports, and virtually (or
> > even) all UDP ports.  Do you have any stats on what fraction of
> > firewall users are able to take advantage of this feature?
> I'm guessing that most users behind that type of firewall shouldn't be
> running a file sharing app anyway unless its approved by the IT
> department.

Heh, true, but the general problem applies to more than file sharing.  In my
case, I'm writing an application that would be used inside exactly this type
of network, and the adoption-pattern generally starts with a couple guys
wanting to test it out before they can convince IT to punch holes in the
firewall.  Right now I support a relay-service as a fallback, but I'd love
to offer NAT-to-NAT and Firewall-to-Firewall where applicable.  Thus the big
question is my mind is: if I implement this feature, how many users would
actually be able to take advantage of it?


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