hi,
The source and destination host is 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 and 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.
The local and 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 and the local host is the client. The local host is the same, for both inbound and outbound traffic.
and also
Source and destination
The source host and destination host is dependent on the direction of traffic. In one case the local client computer might be the source, whereas in another case the remote computer might be the source. The source and the destination relationship is more commonly used in network-based firewalls
Local and remote
The local host is always the local client computer, and the remote host is always a remote computer that is positioned elsewhere on the network. This expression of the host relationship is independent of the direction of traffic. The local and the remote relationship is more commonly used in host-based firewalls, and is a simpler way to look at traffic.