On 2011-5-6, at 21:18, Jonathan Morton wrote:
> On 6 May, 2011, at 9:14 pm, Dave Taht wrote:
> 
>> I am curious as to what the correct behavior here should be for encapsulated (6in4, 6to4, teredo) packets, and if this functionality was also borked. I was under the impression that for encapsulated packets the tos field was copied from the encapsulated packet to the ipv4 header.
> 
> Intuitively, these protocols are at the same level as IP in the stack, so they should preserve ECN information as much as possible.  Copying the TOS field should be sufficient...

Please see http://tools.ietf.org/html/rfc6040. No need to guess.

Lars