Hello.  During my tests, the only variable I changed was the tcp4csum
value with ifconfig on the bge(4) interface.  Ip4csum and udp4csum were
enabled during all tests, and remain so on this production machine.  I
didn't think to try disabling ip4csum while leaving tcp4csum enabled.  Are
these settings not hierarchical?  That is, if you enable tcp4csum, are you
not, by implication, also enableing ip4csum checking?
-thanks
-Brian