BitTorrent is another open project that has overcome these kinds of problems.<div><br></div><div>Don't take this personally, I'm just brainstorming, and this thread is the best place to do that.</div><div><br></div>
<div>So, running list of technologies that have overcome this problem:</div><div> - SIP</div><div> - IM file transfer</div><div> - BitTorrent</div><div><br></div><div>There's an article at The H about "How Skype & Co. Get Round Firewalls."</div>
<div><a href="http://www.h-online.com/security/features/How-Skype-Co-get-round-firewalls-747197.html">http://www.h-online.com/security/features/How-Skype-Co-get-round-firewalls-747197.html</a></div><div><br></div><div>It's on my reading list for this week.</div>
<div><br></div><div>I'm fully aware of the blood and gore involved in ripping out a piece of code like this and replacing it. It's going to be ugly. I'm just looking around for existing solutions. Brilliance does not reside in "original solutions," but rather in employing "the wheel" in unexpected ways. Often, the best way to solve a difficult problem is not to pop open the hood and get elbow-deep in [code] yourself, but rather it is pointing the right person at the solution and letting them surprise you.</div>
<div><br></div><div>j<br clear="all">----<br>- Think carefully.<br>- Contra mundum - "Against the world" (St. Athanasius)<br>- Credo ut intelliga - "I believe that I may know" (St. Augustin of Hippo)<br>
<br><br><div class="gmail_quote">On Sat, Dec 19, 2009 at 3:25 PM, Zooko Wilcox-O'Hearn <span dir="ltr"><<a href="mailto:zooko@zooko.com">zooko@zooko.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
There are currently five tickets about making it easier for people to<br>
use Tahoe-LAFS through firewalls and NATs. You can see them by gong<br>
to the ViewTickets page:<br>
<br>
<a href="http://allmydata.org/trac/tahoe/wiki/ViewTickets" target="_blank">http://allmydata.org/trac/tahoe/wiki/ViewTickets</a><br>
<br>
and scrolling down to the "Keywords" section and look for the keyword<br>
"firewall". They are these:<br>
<br>
<a href="http://allmydata.org/trac/tahoe/ticket/49#" target="_blank">http://allmydata.org/trac/tahoe/ticket/49#</a> UPnP<br>
<a href="http://allmydata.org/trac/tahoe/ticket/50#" target="_blank">http://allmydata.org/trac/tahoe/ticket/50#</a> STUNT/ICE<br>
<a href="http://allmydata.org/trac/tahoe/ticket/169#" target="_blank">http://allmydata.org/trac/tahoe/ticket/169#</a> tcp hole-punching!<br>
<a href="http://allmydata.org/trac/tahoe/ticket/445#" target="_blank">http://allmydata.org/trac/tahoe/ticket/445#</a> implement relay: allow<br>
storage servers behind NAT<br>
<a href="http://allmydata.org/trac/tahoe/ticket/754#" target="_blank">http://allmydata.org/trac/tahoe/ticket/754#</a> merge manually specified<br>
tub location with autodetected tub location<br>
<br>
There are some interesting things in some of these! In #49 Shawn<br>
Willden did a quick experiment (sort of what Extreme Programming<br>
calls a "spike") with miniupnp that was promising. In #169 Greg<br>
Hazel offered some Python code to integrate TCP hole-punching magic<br>
right into the Python sockets.<br>
<br>
My personal favorite approach right now is the extend the helper to<br>
do immutable download, mutable upload, and mutable download and then<br>
treat the helper as the preferred solution for this problem.<br>
However, like Shawn, I am not volunteering to work on this right<br>
now. (If you want to know what I'm volunteering to work on right now<br>
search for tickets that I've accepted. I'm mostly trying to finish<br>
#778 and other tickets that I consider essential for v1.6, plus fix<br>
up buildbots and other testing or quality control issues that I<br>
consider essential for v1.6.)<br>
<br>
Regards,<br>
<font color="#888888"><br>
Zooko<br>
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