There was a lines in the /sbin/ifup:
....
if [ "${IPX}" = yes ]; then
        /etc/sysconfig/network-scripts/ifup-ipx ${DEVICE}
fi
...


Now there is nothing, /etc/sysconfig/network-scripts/ifup-ipx is removed too.

IPX is a working and maintainetd part of Linux for a long time. Why do you
thik that users do not need it? I know there is many LANs with
old-well-working Novell servers.

Do you want to loss your customers only for few lines in the initscripts?