Disabling telnet on Linux iptables firewall


On my Fedora Core 2 server, I call up system-config-securitylevels (the
GUI configuration tool for iptables) and I tell it to disallow telnet.

That works ... no one can telnet in any longer. So far so good.

But, isn't that supposed to disable telnet'ing out, as well?

That doesn't seem to be working.

(In general it seems the iptables configuration GUI is MIGHTY limited in
the things that it can do, and yet the /etc/sysconfig/iptables file, that
gets generated by system-config-securitylevels, has tbis big caveat at the
top: "Firewall configuration written by system-config-securitylevel ...
Manual customization of this file is not recommended".)

I would like to be able to limit all outgoing traffic to http, ssh, and
email, nothing else.

.