Alex, Actually, as I said in previous mail, it's the citation links that are broken, not the link to the document itself.
To summarise the hole-punching aspect of things, it's basically the case that msot NAT routers keep track of recent outbound UDP packets & will allow incoming traffic corresponding to those for a short period afterwards. The mediator tells both ends to send UDP packets to each other to start the ball rolling and once that's done they run something akin to a VPN over UDP. In effect, the two endpoints are using the mediator in place of their own network administrators, which may explain why people feel uneasy about that aspect of things.. :) Cheers, Wez @ RealVNC Ltd. > -----Original Message----- > From: Alex Pankratov [mailto:[EMAIL PROTECTED] > Sent: 03 March 2005 16:35 > To: James Weatherall > Cc: 'John Aldrich'; vnc-list@realvnc.com > Subject: Re: [OFFTOPIC] RE: A simple, solid and stable P2P > Bidirectional NAT Traversal te chnique for RealVNC users... > > > James Weatherall wrote: > > > Alex, > > > > I'm afraid the citation links seem to be broken (nat.html > is missing), so > > it's difficult to see any of the supporting documentation for this. > > Works for me just fine, but here's a direct link anyway - > > http://www.brynosaurus.com/pub/net/p2pnat.pdf > > And few more links while we are at it :) - > > http://alumnus.caltech.edu/~dank/peer-nat.html > http://www.ietf.org/html.charters/nat-charter.html > > > As it stands, UDP "hole-punching" fundamentally requires > that your NAT > > router allow UDP traffic through, which is not something > most good NAT > > firewall/router boxes won't do unless configured to. > > Ok, I'm going to assume that by 'UDP traffic through' you > mean 'inbound > UDP', because 'most good NAT' don't block outbound UDP unless they are > severly locked down. And if you manage to look at the above paper, you > will see that 'hole punching' doesn't require inbound UDP access. In > fact it's a technique for working around this kind of restriction. > > Alex _______________________________________________ VNC-List mailing list VNC-List@realvnc.com To remove yourself from the list visit: http://www.realvnc.com/mailman/listinfo/vnc-list
