  The Casimir force between conducting plates at rest in an inertial frame is
usually computed in equal-time quantization, the natural choice for the given
boundary conditions. We show that the well-known result obtained in this way
can also be obtained in light-front quantization. This differs from a
light-front analysis where the plates are at "rest" in an infinite momentum
frame, rather than an inertial frame; in that case, as shown by Lenz and
Steinbacher, the result does not agree with the standard result. As is usually
done, the analysis is simplified by working with a scalar field and periodic
boundary conditions, in place of the complexity of quantum electrodynamics. The
two key ingredients are a careful implementation of the boundary conditions,
following the work of Almeida et al. on oblique light-front coordinates, and
computation of the ordinary energy density, rather than the light-front energy
density. The analysis demonstrates that the physics of the effect is
independent of the coordinate choice, as it must be.
