The RFC-2460 in chapter 4 explains that one should return a "Parameter
Problem" ICMP for unrecognized extension header. This has an offset
pointing to the "next header field".
Question: What is the value of this offset, if the problematic "next
header" was uncovered by ESP processing?
Admittedly, ESP is a bad example, because one probably should not be
sending the ICMP in this case. But, there might be other future funny
extension headers that produce the next header value in strange
ways?
[Just asking before changing our implementation, which incorrectly(?)
returns ICMP Unreachable (type=1, code=4) for any protocol that
nobody listens. Unknown extension header is just a protocol that has
no handler installed or activated].
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