Well, if all that you want is internet sharing, you can try this...
modprobe iptable_nat
iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE
echo 1 > /proc/sys/net/ipv4/ip_forward
Not sure with RH though, but I just placed that in /etc/rc.d/rc.firewall or you can also place it in /etc/rc.d/rc.local which will execute those commands on boot.
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