After running commands
grep pppd /var/log/audit/audit.log | audit2allow -M mypol
semodule -i mypol.pp
i dont get any error message.
But still i was unable to connect.
Then i saw in /var/log/message that same message (SELinux is preventing....) is generating.
After reboot, i tried once again, and it get working..!
This reply i am posting from Fedora15...

Thanks for your support sir..