ip-up.custom and ip-down.custom scripts?

[Khurram]

/tmp/ppp/ip-up $@
or
/tmp/ppp/ip-down $@

If you mean "/sbin/rc $@" (since originally the /tmp/ppp/ip-up script is linked to /sbin/rc), then I have already tried it and it does not work. I think the /sbin/rc script does things like setting up masquerading, updating /tmp/resolve.conf, updating time, etc. None of these are executed if called like "/sbin/rc $@".