Random thought... if the src and dst IP addresses will always be on the
same network, the data could be layed out as:
network addr (x)
src host addr (y)
dst host addr (y)
This could save enough space to provide 64 bytes of user private data.
Although my preference would be to keep it simpler. (I'm not that
familiar with IPv6 addressing. How does it define network versus host
addressing?)
I don't think you want to make the assumption that src and dst addrs are on
the same IP network. While that may be true for a set of IB hosts on a
common IB switch set as a single IP subnet, there may be TCP/IB
bridge/gateway products that allow remote IP hosts to connect into an IB
cluster and those could certainly be on a remote subnet.
IPv6 addrs define networks in a similar manner to IPv4: IE some number of
the bits in the address define the network number, and the remaining define
the host number.
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