is received. It is necessary because in the case of a dropped packet,
while it is understandable to return DECOMP_ERROR, it has the side effect
of making NetBSD desactivate the MPPE decompressor on the PPP interface.
A comment in net/if_ppp.c mentions a patent that would prohibit an
automatic failure recovery in that case, so it would need MPPE-specific
code in net/if_ppp.c, which of course is impossible since the MPPE
decompressor is only available as a LKM.
Just ignoring the problem is a bit of a hack, but is a much more nicer
solution that what I used when I first encountered the issue.
Problem reported and patch provided in PR 23593, by Yoshitaka Tokugawa.
e299dd8c0e