As QoS is useless outside of administrative network boundaries, most of the Internet ignores them. The moment your packets go into the tunnel, they are traveling over an unknown network that will thus ignore those QoS fields. Hence, adding them won't make much of a difference. If your own gear needs to know about those fields you should terminate the tunnel at the edge of your administrative domain instead of somewhere in the middle of your network. Note: if you have a Linux kernel and a proto-41 based tunnel one can set the copying behavior using: ip tunnel change <interface> tos 1 That only works for proto-41 aka 'sit' tunnels. That trick does not work for AYIYA as AICCU does not implement it, as noted above, it is mostly useless as networks ignore it. The bigger question you should have is why you are having to use QoS in the first place. Because if you have a full pipe, it is better to fix the usage there or get a bigger pipe. See also BufferBloat