YP/NIS, NFS, RPC, and lokkit
Date Created: 2002-04-05
Author: Luke Scharf email@example.com
* RedHat 7.x
* ypbind can find the ypserver, but "ypcat passwd" times out
RPC error. "rpcinfo -p" returns a correct-looking list of
* NFS won't mount an exported directory; RPC times out.
You can disable RedHat's built-in firewall by running /usr/sbin/lokkit.
You can get some measure of security back by using /etc/hosts.allow and
The RedHat firewall configurator (/usr/sbin/lokkit) sets up iptables so
that udp traffic is only accepted on specific ports and from specific
locations (like your DNS servers). The portmapper uses semi-arbitrary
ports (that's why the ports have to be mapped), so it's a lot more work
to set up machine-by-machine security.