09-25-2017
1. I thought every running process including firewall process has to have a socket [IP Port] associated with it.
Not sure if firewall process was excluded from the rule, becoz the firewall process port does not show up no matter what.
This makes me believe that there can be processes like firewalld that can run without acquiring a port ? Interesting but some new concept to me.
2. Also, from @Chubler_XL's statement I understand that there is no way to remotely monitor the firewall like we monitor SMTP [port 25] or SSH [port 22].
Are both my understanding correct ?
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APF(1) General Commands Manual APF(1)
NAME
apf - easy iptables based firewall system
SYNOPSIS
apf
DESCRIPTION
This manual page documents briefly the apf command. This manual page was written for the Debian distribution because the original program
does not have a manual page.
Advanced Policy Firewall (APF) is an iptables (netfilter) based firewall system designed around the essential needs of today's Internet
deployed servers and the unique needs of custom deployed Linux installations. The configuration of APF is designed to be very informative
and present the user with an easy to follow process, from top to bottom of the configuration file. The management of APF on a day-to-day
basis is conducted from the command line with the 'apf' command, which includes detailed usage information and all the features one would
expect from a current and forward thinking firewall solution.
OPTIONS
apf follow the usual GNU command line syntax, with long options starting with two dashes (`-'). A summary of options is included below.
-s|--start
load all firewall rules
-r|--restart
stop (flush) & reload firewall rules
-l|--list
list all firewall rules
-t|--status
output firewall status log
-e|--refresh
refresh & resolve dns names in trust rules
-a <HOST CMT|--allow <HOST COMMENT>
add host (IP/FQDN) to allow_hosts.rules and immediately load new rule into firewall
-d <HOST CMT|--deny <HOST COMMENT>
add host (IP/FQDN) to deny_hosts.rules and immediately load new rule into firewall
-u <HOST>|--remove <HOST>
remove host from [glob]*_hosts.rules and immediately remove rule from firewall
-o|--ovars
output all configuration options
COPYRIGHT
Copyright (C) 1999-2007, R-fx Networks <proj@r-fx.org>
Copyright (C) 2007, Ryan MacDonald <ryan@r-fx.org> This program may be freely redistributed under the terms of the GNU GPL
This manual page was written by Giuseppe Iuculano <giuseppe@iuculano.it>, for the Debian project (but may be used by others).
August 17, 2008 APF(1)