Of NAT has a detailed summary analysis of the difficulty lies through UPnP. And based on the adoption of UPnP to achieve through UPnP, the source code written using VB.

Packet : 59564374project.upnp.submit.rar filelist
project.upnp.submit\nat.inclient\clsBringData.cls
project.upnp.submit\nat.inclient\frmAbout.frm
project.upnp.submit\nat.inclient\frmAbout.frx
project.upnp.submit\nat.inclient\frmUPnPTraversalBringIn.frm
project.upnp.submit\nat.inclient\frmUPnPTraversalBringIn.frx
project.upnp.submit\nat.inclient\frmUPnPTraversalIn.frm
project.upnp.submit\nat.inclient\mdiMain.frm
project.upnp.submit\nat.inclient\modMain.bas
project.upnp.submit\nat.inclient\modUtil.bas
project.upnp.submit\nat.inclient\NATTraversal.exe
project.upnp.submit\nat.inclient\NATTraversal.vbp
project.upnp.submit\nat.inclient\NATTraversal.vbw
project.upnp.submit\nat.inclient\natupnp.tlb
project.upnp.submit\nat.inclient\说明.txt
project.upnp.submit\nat.outclient\clsBringData.cls
project.upnp.submit\nat.outclient\frmOutClientServer.frm
project.upnp.submit\nat.outclient\frmOutClientServer.frx
project.upnp.submit\nat.outclient\NATTraversalOutClient.exe
project.upnp.submit\nat.outclient\NATTraversalOutClient.vbp
project.upnp.submit\nat.outclient\NATTraversalOutClient.vbw
project.upnp.submit\基于UPnP的穿越NAT的技术.doc
project.upnp.submit\基于UPnP的穿越NAT的技术－附件1（文档资料清单）.doc
project.upnp.submit\基于UPnP的穿越NAT的技术－附件2（实验资料清单）.doc
project.upnp.submit\nat.inclient
project.upnp.submit\nat.outclient
project.upnp.submit

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