Nat Application - ZyXEL Communications VMG1312-B Series User Manual

11.8.4 NAT Application

The following figure illust rat es a possible NAT applicat ion, where t hree inside LANs ( logical LANs
using I P alias) behind t he Device can com m unicat e wit h t hree dist inct WAN net works.
Figure 85 NAT Applicat ion Wit h I P Alias
Port Forwarding: Services and Port Numbers
The m ost oft en used port num bers are shown in t he following t able. Please refer t o RFC 1700 for
furt her inform at ion about port num bers. Please also refer t o t he Support ing CD for m ore exam ples
and det ails on port forwarding and NAT.
Table 62 Services and Port Num bers
SERVICES
ECHO
FTP ( File Transfer Prot ocol)
SMTP ( Sim ple Mail Transfer Prot ocol)
DNS ( Dom ain Nam e Syst em )
Finger
HTTP ( Hyper Text Transfer prot ocol or WWW, Web)
POP3 ( Post Office Prot ocol)
NNTP ( Net work News Transport Prot ocol)
SNMP ( Sim ple Net work Managem ent Prot ocol)
SNMP t rap
PPTP ( Point- t o- Point Tunneling Prot ocol)
VMG1312-B Series User's Guide
Chapter 11 Network Address Translation (NAT)
PORT NUMBER
7
21
25
53
79
80
110
119
161
162
1723
199