Default Server Ip Address; Port Forwarding: Services And Port Numbers; Configuring Servers Behind Port Forwarding (Example); Table 101 Services And Port Numbers - ZyXEL Communications ZyWall 35 User Manual

16.5.1 Default Server IP Address

In addition to the servers for specified services, NAT supports a default server IP address. A
default server receives packets from ports that are not specified in this screen.

16.5.2 Port Forwarding: Services and Port Numbers

The ZyWALL provides the additional safety of the DMZ ports for connecting your publicly
accessible servers. This makes the LAN more secure by physically separating it from your
public servers.
Use the Port Forwarding screen to forward incoming service requests to the server(s) on your
local network.
The most often used port numbers are shown in the following table. Please refer to RFC 1700
for further information about port numbers. Please also refer to the Supporting CD for more
examples and details on port forwarding and NAT.

Table 101 Services and Port Numbers

SERVICES
ECHO
FTP (File Transfer Protocol)
SMTP (Simple Mail Transfer Protocol)
DNS (Domain Name System)
Finger
HTTP (Hyper Text Transfer protocol or WWW, Web)
POP3 (Post Office Protocol)
NNTP (Network News Transport Protocol)
SNMP (Simple Network Management Protocol)
SNMP trap
PPTP (Point-to-Point Tunneling Protocol)

16.5.3 Configuring Servers Behind Port Forwarding (Example)

Let's say you want to assign ports 21-25 to one FTP, Telnet and SMTP server (A in the
example), port 80 to another (B in the example) and assign a default server IP address of
192.168.1.35 to a third (C in the example). You assign the LAN IP addresses and the ISP
assigns the WAN IP address. The NAT network appears as a single host on the Internet.
Chapter 16 Network Address Translation (NAT)
Note: If you do not assign a Default Server IP address, the
ZyWALL discards all packets received for ports that are not
specified here or in the remote management setup.
ZyWALL 35 User's Guide
PORT NUMBER
7
21
25
53
79
80
110
119
161
162
1723
303