Compute IP checksums in addition to TCP checksums when necessary in the new 'aliased' packets.  Note, if the original packet has a bogus cksum, we will *NOT* re-compute the cksum, therefore the new packet will also be wrong (but passed on).
Compute IP checksums in addition to TCP checksums when necessary in the
new 'aliased' packets.  Note, if the original packet has a bogus cksum,
we will *NOT* re-compute the cksum, therefore the new packet will also
be wrong (but passed on).

Found by:	MartinRenters@awfulhak.demon.co.uk
Reviewed by:	Brian Somers <brian@awfulhak.demon.co.uk>
Submitted by:	Charles Mott <cmott@srv.net>

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