NAT64 and ICMP

[marcelo bagnulo <marcelo@it.uc3m.es>]

Hi,
another issue that was brought up by thomas in the v6ops meeting is 
w.r.t. ICMP translation.

With this respect, RFC4966 states:

  o  As described in Section 2.2 of [NATP-APP], there are no
     equivalents in IPv6 for some ICMP(v4) messages, while for others
     (notably the 'Parameter Problem' messages) the semantics are not
     equivalent.  Translation of such messages may lead to the loss of
     information.  However, this issue may not be very severe because
     the error messages relate to packets that have been translated by
     NAT-PT rather than by arbitrary packets.  If the NAT-PT is
     functioning correctly, there is, for example, no reason why IPv6
     packets with unusual extension headers or options should be
     generated.


So, do you think we need to impose more stringent requirement on ICMP 
translation than what NATPT/SIIT does? would it be possible to do any 
better?

suggestions are welcome

thanks, marcelo