> The real payload packets (that is, currently, only IP) are handled
> inside the kernel.
> 
> However, everything not recognized is still output (rather: input) via
> the read() system call. The pppd uses this to access the link control
> protocol, the authentication protocols and the IP control protocol, and
> would use it for other protocol control protocols once we support them
> via PPP.

Q for the future: how hard would it be to add AppleTalk support? Obvoiusly
we need netatalk in the kernel, but what next? There's an RFC on it..

Take care,

Bill