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Lllllllllll L.a. Sam Toogood ------- Original message ------- From: dave <dcglug@xxxxxxxxxxxxx> Sent: 27.2.'09, 11:00 > Grant Sewell wrote: > > On Fri, 27 Feb 2009 09:44:36 +0000 > > dave wrote: > > > > > >> When EntaNet bothered providing a connection I had a static IP > >> address, and from outside I could simply ssh tunnel into it. However, > >> with mobile broadband they use their own NAT somewhere in their > >> network. Does anyone know a solution to this? Skype works okay, so > >> there is obviously a technique that punches through their and my NAT, > >> but I don't know how to ssh in, short of setting up a reverse tunnel > >> to an external machine. That would provide another point of failure, > >> and slow the connection further. > >> > > > > I believe Skype works because both ends need to communicate with > > Skype's own server and that handles the traffic at both ends... hence > > wh you can't use Skype on an internal network that has no Internet > > connectivity. > > > > Grant. > > > > > It sets up the initial communication talking to a third party, but then > sets up peer-to-peer comms for the speech traffic. VoIP with SIP / RTP > does the same. To do this it needs to punch a hole through the firewall. > There are various techniques to do this, but Skype seems to be very good > at it. This is all UDP. There are techniques for punching through > firewalls with TCP, which I would need for ssh, but they are more > complex. NAT is great until you want p2p through it. > > http://www.linuxjournal.com/article/9004 > > D > > -- > The Mailing List for the Devon & Cornwall LUG > http://mailman.dclug.org.uk/listinfo/list > FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html