Date: Tue, 05 Oct 2004 15:24:14 +0100 From: Jim Hatfield <subscriber@insignia.com> To: freebsd-questions@freebsd.org Subject: Re: ipnat and "udp consistent translation" (Skype related) Message-ID: <n9b5m0pdgm3as090vtimgflvjtvu7krg1p@4ax.com> In-Reply-To: <3203DF3DDE57D411AFF4009027B8C3675FCF17@exchange-uk.isltd.insignia.com> References: <3203DF3DDE57D411AFF4009027B8C3675FCF17@exchange-uk.isltd.insignia.com>
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On Wed, 29 Sep 2004 13:45:40 +0100, in local.freebsd.questions you wrote: >Using Skype on a machine behind a FreeBSD 4.x firewall using >ipf/ipnat, if I try a file transfer I get "your connection is relayed" >which suggests that there are problems using "UDP hole punching" to >get a direct connection. The Skype help page sends you to: > >http://bgp.lcs.mit.edu/~dga/view.cgi > >where ipnat gets a "no" in the "udp consistent translation" column. I think this info must be out of date, and that ipnat really does do "UDP consistent translation". This is a bit of output from=20 ipnat -l: >MAP 172.16.64.16 13432 <- -> 195.74.141.61 5132 [159.148.187.95 = 27452] >MAP 172.16.64.16 13432 <- -> 195.74.141.61 5132 [70.48.222.77 = 51689] >MAP 172.16.64.16 13432 <- -> 195.74.141.61 5132 [80.131.15.67 = 24122] >MAP 172.16.64.16 13432 <- -> 195.74.141.61 5132 [67.8.167.204 = 52284] >MAP 172.16.64.16 13432 <- -> 195.74.141.61 5132 [24.201.154.49 = 57657] >MAP 172.16.64.16 13432 <- -> 195.74.141.61 5132 [82.36.75.76 = 41765] >MAP 172.16.64.16 13432 <- -> 195.74.141.61 5132 [139.91.190.109 = 4709] >MAP 172.16.64.16 13432 <- -> 195.74.141.61 5132 [65.93.139.84 = 56670] >MAP 172.16.64.16 13432 <- -> 195.74.141.61 5132 [210.221.94.233 = 5387] The machine running Skype is 172.16.64.16 and Skype's Options->Connections property page shows 13432 as the port number. I presume 5132 is the translated port number. Looks pretty consistent to me. So it was a red herring and I'll have to look elsewhere. jim
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