David Miller writes:
 > Essentially, if you use ports as part of your selector,
 > then it is impossible to handle anything other than the
 > first fragment of a fragmented frame because the subsequent
 > fragments will not have the ports which you need in order
 > to match.

If you have port/protocol based selectors and you are firewalling then
re-assembly is already being done so IPsec will see the re-assembled
packet at little cost.  Alternately in a pure IPsec configuration it
possible to arrange things so that re-assembly is only done if
port/protocol based selectors are used.
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