> I have limited resources to play around with, but on my
> OpenBSD.current PPP system, one of:
>
> ping -s2955 1.2.3.4 or
> ping -s1455 1.2.3.4 causes kernel panic
I have tested this -- after removing the default route -- on
NetBSD-current, and I cannot reproduce the problem. However, I believe
that this problem was fixed quite some time ago, and a fairly exhaustive
search for death packets near several `magic' sizes has turned up no
problem such as the one you describe.
(It's conceivable that this is driver-specific, though not
particularly likely.)
--scott