Usually this is an IP-forwarding problem; I don't know why the ppp howto
doesn't tell you that you need to have IP forwarding compiled into the kernel
AND ENABLED on the startup (or whenever you plan to use ppp or any other
service that forwards IP).
Even if IP forwarding isn't enabled, you should still be able to access the
machine that's providing ppp dialup through telnet, ftp and/or ping; if that's
the case, then IP forwarding is probably what's holding you up.
$ cat /proc/sys/net/ipv4/ip_forward
This should yield a 1. If not, become root and
# echo '1' >/proc/sys/net/ipv4/ip_forward
That should enable ip forwarding for now. Then, edit your
/etc/sysconfig/network and make sure it contains this line:
FORWARD_IPV4=yes
That will make it work on the boot.
If this doesn't solve your problem, then my next guess is that there's
something up with your ppp setup; look into the "proxyarp" option, which I
think is detailed in the HOWTO.
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