Examples, Internet access only, 4 examples – ZyXEL Communications Broadband Security Gateway P-312 User Manual
Page 86: 1 internet access only
P312 Broadband Security Gateway
NAT
6-13
Figure 6-11
Menu 15.2 – NAT Server Setup
Table 6-7
Services & Port numbers
Services
Port Number
FTP (File Transfer Protocol)
21
Telnet
23
SMTP (Simple Mail Transfer Protocol)
25
DNS(Domain Name System)
53
HTTP (Hyper Text Transfer protocol or WWW, Web)
80
PPTP (Point-to-Point Tunneling Protocol)
1723
6.4 Examples
6.4.1 Internet
Access
Only
In our Internet access example, we only need one rule where all our ILAs (Inside Local addresses) map to
one dynamic IGA (Inside Global Address) assigned by our ISP.
Menu 15.2 - NAT Server Setup
Port #
----
IP Address
---------------
1
.
Default
0.0.0.0
2.21
192.168.1.33
3.23
192.168.1.34
4.25
192.168.1.35
5.80
192.168.1.36
6. 0
0.0.0.0
7. 0
0.0.0.0
8. 0
0.0.0.0
9. 0
0.0.0.0
10. 0
0.0.0.0
11. 0
0.0.0.0
12. 1025
RR Reserved
Press ENTER to Confirm or ESC to Cancel: