Firewall¶

Synopsis¶

A firewall is a network security system that controls the incoming and outgoing network traffic based on an applied rule set. Firewalls exist both as a software solution and as a hardware appliance.

Help command¶

This help command assist the user about ptconfigure. It guides the user permission. The user can do the modification as per wish. Help image will guide the user. Let’s visualize it.

ptconfigure Firewall help

The screenshot for the above command is listed below,

kevell@corp:/# ptconfigure Firewall help
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This command allows you to modify create or modify firewalls

 Firewall, firewall

       - enable
       Enable system firewall
       example: ptconfigure firewall enable

       - disable
       Disable system firewall
       example: ptconfigure firewall disable

       - allow
       Allow a Firewall rule
       example: ptconfigure firewall allow --firewall-rule="ssh/tcp"

       - deny
       Deny a Firewall rule. Allow connection attempts to be ignored and time out.
       example: ptconfigure firewall deny --firewall-rule="ssh/tcp"

       - reject
       Reject a Firewall rule. Terminate connections attempts with an error to the connector.
       example: ptconfigure firewall reject --firewall-rule="ssh/tcp"

       - limit
       Limit a Firewall rule. ufw will deny connections if an IP address has attempted
       to initiate 6 or more connections in the last 30 seconds.
       example: ptconfigure firewall limit --firewall-rule="ssh/tcp"

       - delete
       Delete a Firewall rule.
       example: ptconfigure firewall delete --firewall-rule="ssh/tcp"

       - insert
       Insert a Firewall rule.
       example: ptconfigure firewall insert --firewall-rule="ssh/tcp"

       - reset
       Reset a Firewall rule.
       example: ptconfigure firewall reset --firewall-rule="ssh/tcp"

       - default
       Set default policy, should be allow, deny, or reject
       example: ptconfigure firewall default --policy="deny"

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End Help
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Options¶

Firewalls rules can be customized as per your needs, requirements & security threat levels. The user can create or disable firewall rules based on such conditions as:

Parameters	Function	Command
IP address	Blocking off a certain IP address or a range of IP addresses, which you think are predatory
Enable	Enable system firewall	ptconfigure firewall enable
Disable	Disable system firewall	ptconfigure firewall disable
Allow	Allow firewall rule	ptconfigure firewall allow –firewall-rule=”ssh/tcp”
Deny	Allow connection attempt to be ignored and time out	ptconfigure firewall deny –firewall-rule=”ssh/tcp”
Reject	Terminate connection attempts with an error to the connector	ptconfigure firewall reject –firewall-rule=”ssh/tcp”
Limit	Ufw will deny connections if an IP address has initiate 6 or attempted to more connection in the last 30 seconds.	ptconfigure firewall limit –firewall-rule=”ssh/tcp”
Delete	Delete a firewall rule	ptconfigure firewall delete –firewall-rule=”ssh/tcp”
Insert	Insert a firewall rule	ptconfigure firewall insert –firewall-rule=”ssh/tcp”
Reset	Reset a firewall rule	ptconfigure firewall reset –firewall-rule=”ssh/tcp”
default	Default policy, should be allow, deny or reject.\|	ptconfigure firewall default – policy=”deny”

Benefits¶

The firewall prevents unwanted access to the system over a network connection by identifying and preventing communication over risky ports.
System communicate over many different recognized ports, and the firewall will tend to permit these without prompting or alerting the user.
Firewalls can also detect “suspicious” activity from the outside.
The user can set their rule according to their wish.