Host

A host is a device that connects to the network and that has an Internet address. You add the hosts that you want the firewall to allow or block to restrict incoming and outgoing network activity in the Firewall policy. For example, you may want to always allow traffic to and from the computers in the
yourcompany
.com domain, but block IP addresses from known advertisers.
  • Select
    Add From Host Group
    to add a list of hosts that can be shared across multiple firewall rules and Firewall policies.
  • Select
    Add Host
    to add a host to the selected firewall rule only.
You define either the source host and the destination host relationship, or the remote host and the local host relationship. Either method provides the same functionality.
Source/destination hosts and local/remote hosts
Option
Description
Source/Destination
Specifies the source and the destination address or the host name.
The source and the destination host are defined as follows:
  • Source
    Computer that the packet comes from. For the inbound traffic, the source is the remote host. For the outbound traffic, the source is the local host.
  • Destination
    Computer that the packet goes to. For inbound traffic, the destination is the local host. For outbound traffic, the destination is the remote host.
If the client communicates with a Web server and the traffic is inbound, then the source host is the Web server; the destination host is the client. If the traffic is outbound, the source host is the client and the destination host is the Web server.
Local/Remote
Specifies the local or the remote address or the host name.
The local and the remote host is defined as follows:
  • Local
    Client computer
  • Remote
    Computer that communicates with the client computer
If the client communicates with a Web server, the remote host is the Web server; the local host is the client. The local host is the same, for both inbound traffic and outbound traffic.
The relationship between source and destination hosts illustrates the source relationship and destination relationship with respect to the direction of traffic.
The relationship between local and remote hosts illustrates the local host and remote host relationship with respect to the direction of traffic.