The Illner model is the most general two-velocity model of the discrete Bol
tzmann equation. It includes, as particular cases, both the Carleman and th
e KcKean model. Exact solutions in 1 + 1 dimensions of the general two-velo
city discrete Illner model can be studied in a concise way. The conclusions
of the precursors need ameliorating. A new type of exact solutions in 1 1 dimensions is obtained. This gives a general method for studying non-triv
ial exact solutions for the similar discrete Boltzmann equation.