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 DEBIAN
ipkungfu
ipkungfu(8) System Manager's Manual ipkungfu(8)
NAME
ipkungfu - An iptables-based firewall for Linux
SYNOPSIS
ipkungfu [ -c ] [ -t ] [ -d ] [ -h ] [ -v ] [ --quiet ] [ --panic ] [ --no-caching
DESCRIPTION
ipkungfu is an iptables-based Linux firewall. The primary design goals are security, ease of use, and performance, in that order. It takes
advantage of advanced features of iptables, tcpwrappers, and the Linux kernel. It also simplifies the configuration of internet connection
sharing, advanced routing, and other networking needs.
OPTIONS
-c (or --check)
Check whether ipkungfu is loaded, and report any command line options it may have been loaded with.
-t (or --test)
Runs a configuration test, and displays the results. Note that this does not test or display all configuration options. This
gives you an opportunity to verify that major configuration options are correct before putting them into action.
-d (or --disable)
Disables the firewall. It is important to know exactly what this option does. All traffic is allowed in and out, and in the
case of a gateway, all NATed traffic is forwarded (the option retains your connection sharing options). Custom rules are not
implemented, and deny_hosts.conf is ignored.
-f (or --flush)
Disables the firewall COMPLETELY. All rules are flushed, all chains are removed. Any port forwarding or internet connection
sharing will cease to work.
-h (or --help)
Displays brief usage information and exits.
-v (or --version)
Displays version information and exits.
--quiet Runs ipkungfu with no standard output
--panic Drops ALL traffic in all directions on all network interfaces. You should probably never use this option. The --panic option
is available for the highly unusual situation where you know that an attack is underway but you know of no other way to stop
it.
--failsafe If ipkungfu fails, --failsafe will cause all firewall policies to revert to ACCEPT. This is useful when working with ipkungfu
remotely, to prevent loss of remote access due to firewall failure.
--no-caching
Disables rules caching feature.
FILES
/etc/ipkungfu/ipkungfu.conf
/etc/ipkungfu/advanced.conf
/etc/ipkungfu/accept_hosts.conf
/etc/ipkungfu/deny_hosts.conf
/etc/ipkungfu/custom.conf
/etc/ipkungfu/log.conf
/etc/ipkungfu/redirect.conf
/etc/ipkungfu/services.conf
/usr/sbin/ipkungfu
/usr/share/doc/ipkungfu/AUTHORS
/usr/share/doc/ipkungfu/README
/usr/share/doc/ipkungfu/FAQ
/usr/share/doc/ipkungfu/ChangeLog
/usr/share/doc/ipkungfu/COPYING
SEE ALSO
iptables(8).
January 2003 ipkungfu(8)