01-17-2020
Check firewall-cmd or iptables -L (depending on linux release and type) rules for specific rules, containing IP addresses in questions.
This should help, if linux firewall is used.
If not, other advice given here (ss netstat nmap) should provide reasonable info.
Please, when asking such question in future, please specify your operating system and version.
This will help us help you.
Regards
Peasant.
This User Gave Thanks to Peasant For This Post:
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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)