[tianyicui]

I just tried, it does have the ability to route DNS requests through the tunnel.

Out of curiosity, is it theoretically possible to route other kinds of traffic over this, e.g. UDP, ICMP(ping)? Thanks.

[tlrobinson]

Sure it's possible (see: http://en.wikipedia.org/wiki/IP_over_Avian_Carriers). I don't know why they haven't done it yet.

[Xurinos]

You are referring to the lowest OSI layer. It is easy to propose laying out new line (or network of birds), but the costs are huge.

http://img.tfd.com/cde/OSI.GIF

[fs111]

OSI? Really? http://pablotron.org/files/7_layer_burrito.html