D-Link DFL-1600 User Manual page 63

8.2. Services
Example:
In this example, the service HTTP for connecting web servers is defined.
As explained previously, HTTP uses TCP destination port 80.
WebUI
:
Objects Services
Enter the following and then click OK:
General
Name: HTTP
Type: TCP
Source: 0-65535
Destination: 80
ICMP based services
Internet Control Message Protocol (ICMP), is a protocol integrated with IP
for error reporting and transmitting control information. The PING service,
for example, uses ICMP to test an Internet connectivity. ICMP message is
delivered in IP packets, and each message is a separate protocol having its
own format. Its content changes depending on the Message Type & Code.
The ICMP message types that can be configured in D-Link firewalls along
with the various codes are listed as follows:
Echo Request – sent by PING to a destination in order to check
connectivity.
Destination Unreachable – the source is told that a problem has
occurred when delivering a packet. There are codes from 0 to 5 for
this type:
- Code 0. Net Unreachable
- Code 1. Host Unreachable
- Code 2. Protocol Unreachable
- Code 3. Port Unreachable
- Code 4. Cannot Fragment
- Code 5. Source Route Failed
Specifying a TCP service -- HTTP
Add
D-Link Firewalls User's Guide
TCP/UDP:
43