Re: proposal: TCP rendevous

2005-11-30 Thread Doug Barton
Julian Elischer wrote: > In this world of P2P apps it would be neat to have a way that two P2P apps > could attach to each other even though each is through a firewall. Most > firewalls only allow > "outgoing" connections. There is a great deal of work in this area in the IETF. It's mostly focused

Re: proposal: TCP rendevous

2005-11-29 Thread Stefan Bethke
Am 27.11.2005 um 11:18 schrieb Paweł Małachowski: On Sat, Nov 26, 2005 at 10:18:49PM -0800, Julian Elischer wrote: I'm still thinking about connecting systems separated by NAT however. that's a trickier problem. you still need to use outgoing connections but no-one who is not in the path ca

Re: proposal: TCP rendevous

2005-11-27 Thread Daniel Hartmeier
On Sun, Nov 27, 2005 at 02:21:02PM -0800, Julian Elischer wrote: > yes, which means it might unexpectedly fail. I don't see how it can be done with TCP, assuming both peers are behind NATing firewalls (like pf). Some tricks to consider are: Let one peer send a SYN through the firewall towards t

Re: proposal: TCP rendevous

2005-11-27 Thread Julian Elischer
Brian Candler wrote: On Sat, Nov 26, 2005 at 10:18:49PM -0800, Julian Elischer wrote: In this world of P2P apps it would be neat to have a way that two P2P apps could attach to each other even though each is through a firewall. Most firewalls only allow "outgoing" connections. It would of

Re: proposal: TCP rendevous

2005-11-27 Thread Brian Candler
On Sat, Nov 26, 2005 at 10:18:49PM -0800, Julian Elischer wrote: > In this world of P2P apps it would be neat to have a way that two P2P apps > could attach to each other even though each is through a firewall. Most > firewalls only allow > "outgoing" connections. > > It would of course be possib

Re: proposal: TCP rendevous

2005-11-27 Thread Paweł Małachowski
On Sat, Nov 26, 2005 at 10:18:49PM -0800, Julian Elischer wrote: > I'm still thinking about connecting systems separated by NAT however. > that's a trickier problem. you still need to use outgoing connections but > no-one who is not in the path can not tell what the NAT'd packets looke > like. B

Re: proposal: TCP rendevous

2005-11-26 Thread Mike Silbersack
On Sat, 26 Nov 2005, Julian Elischer wrote: In this world of P2P apps it would be neat to have a way that two P2P apps could attach to each other even though each is through a firewall. Most firewalls only allow "outgoing" connections. Go research Microsoft's uPnP firewall support. Mike "S