Enrique Zanardi asked about whether it would be useful to have PPP
on the installation boot disk, for cases where the boot kernel (or
any kernel) has no access to a floppy drive or CD. PPP might be
useful, but I don't know if it would be worth the space. Almost
anywhere that you can get a fast enough serial link to be useful,
you can have a parallel connection instead.
A PLIP driver on the installation boot disk would be a godsend.
I have successfully installed Red Hat on laptops via PLIP twice,
once because the laptop had no CD drive, the other because it
had a PCMCIA floppy and (also) no CD drive. Red Hat installation
via PLIP is painful only because Red Hat installation software is
so buggy; the PLIP connection, once configured, is a positive joy.
(FWIW: RH5.1's bug is that it turns on "ifconfig plip0 arp", so you
have to turn it on at the other end too, abnormally.)
plip.o on x86 is only 12Kbytes; ppp.o is 26K. PLIP is much easier
to configure than PPP. I guess you can tell how I would vote.