What can I do to avoid a relayed transfer? (Techies only!)

There is no simple answer to this question since there are so many different types of network configurations. However, there are several things you can do to ensure or at least improve the likelihood that you will have a direct (and probably faster) transfer. Relayed transfers are usually caused by the firewall/NAT/router not allowing UDP packets out and their replies back in. Opening ports is usually not necessary, but it can help in some cases, depending on the firewall/NAT/router.

It may help to consult your firewall/NAT vendor or documentation to find out whether this is possible or how to configure you firewall/NAT to allow UDP replies in (usually in the advanced settings). About 75% of firewall/NAT/router's are "p2p-friendly" which means that they are configured by default to let this traffic through in a special way (technically, they allow "UDP Consistent Translation"). If you are buying a new firewall/NAT/router, you should look for one that is "p2p-friendly".

You can also find out if your firewall/NAT/router is "p2p friendly" by consulting the following list: http://bgp.lcs.mit.edu/~dga/view.cgi. A "Yes" in the "UDP Consistent Translation" column indicates that the firewall/NAT is "p2p-friendly" and will allow high-speed transfers.

If your device isn't listed, you can also run a program called NATcheck which can be found at http://midcom-p2p.sourceforge.net/. Please help us and future users by submitting the results of your test to our forums. Note that Skype cannot take any responsibility for the content on non-Skype pages!

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