[e2e] Applications with UDP checksum disabled

[Eric Brunner-Williams in Portland Maine]

> Disclaimer:  I spent only a handful of months working as a consultant
> on the initial reference port of NFS to SVR3 in Bob Lyon's group in
> the winter of 1985/1986.

ACK on ports to 4.2BSD (1985) and IRIX (1986). There were bigger problems
available then (lance vs 85286 back-to-back and ND handling was a cutie).

Eric