01-20-2011
I still don't know for sure you have a real, external IP address, just that you don't have that particular internal IP address. That could explain some things if it isn't. If it's 192.168.x.x, 172.16.x.x, or 10.x.x.x, then it's internal.
How the firewall is configured varies from distro to distro and program to program, though it's all iptables in the end. iptables-dump as root should print the current firewall configuration. Usually though, a firewall would be more diligent in preventing things from connecting to the server than stopping the server from connecting to arbitrary things. A really paranoid firewall could do both of course.
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LEARN ABOUT CENTOS
firewall-config
FIREWALL-CONFIG(1) firewall-config FIREWALL-CONFIG(1)
NAME
firewall-config - firewalld GUI configuration tool
SYNOPSIS
firewall-config [OPTIONS...]
DESCRIPTION
firewall-config is a GUI configuration tool for firewalld.
OPTIONS
firewall-config does not support any special options. The only options that can be used are the general options that Gtk uses for Gtk
application initialization. For more information on these options, please have a look at the runtime documentation for Gtk.
The following options are supported:
-h, --help
Prints a short help text and exists.
SEE ALSO
firewall-applet(1), firewalld(1), firewall-cmd(1), firewall-config(1), firewalld.conf(5), firewalld.direct(5), firewalld.icmptype(5),
firewalld.lockdown-whitelist(5), firewall-offline-cmd(1), firewalld.richlanguage(5), firewalld.service(5), firewalld.zone(5),
firewalld.zones(5)
NOTES
firewalld home page at fedorahosted.org:
http://fedorahosted.org/firewalld/
More documentation with examples:
http://fedoraproject.org/wiki/FirewallD
AUTHORS
Thomas Woerner <twoerner@redhat.com>
Developer
Jiri Popelka <jpopelka@redhat.com>
Developer
firewalld 0.3.9 FIREWALL-CONFIG(1)