The meeting minutes record a disagreement over what port mapping
algorithm to use. This affects both MAP-E and LW 4over6. As I understand it:
- either of these two technologies will work with either contiguous
ports or ports scattered according to the GMA algorithm
- the real objection to GMA comes from Alain Durand, who wants to set up
simple min-port, max-port filters on his network equipment.
We all agree that port scattering offers negligible security advantage.
The reason that I heard given for preferring GMA for MAP-E is that it
eliminates a restriction on the End-User Ipv6 address because the PSID
is free to range from 0 upwards rather than from some higher number
upwards. I don't follow this argument for two reasons:
- you now have a restriction that the offset field A must range from 1
upwards
- the PSID field has an upper limit 2^k-1 imposed by the sharing ratio,
imposing a further restriction on the End-User IPv6 address value.
Could someone spell out more clearly why the GMA was seen as necessary
for MAP-E?
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