Chapter 11 Network Address Translation (NAT)
VMG1312-B Series User’s Guide
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11.8.4 NAT Application
The following figure illustrates a possible NAT application, where t hree inside LANs ( logical LANs
using I P alias) behind the Device can com m unicate wit h t hree distinct 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 to RFC 1700 for
further inform ation about port num bers. Please also refer t o the Supporting CD for m ore exam ples
and details on port forwarding and NAT.
Table 62 Services and Port Num bers
SERVICES PORT NUMBER
ECHO 7
FTP (File Transfer Protocol) 21
SMTP (Sim ple Mail Transfer Pr ot ocol) 25
DNS (Dom ain Nam e System ) 53
Finger 79
HTTP ( Hyper Text Transfer prot ocol or WWW, Web) 80
POP3 ( Post Office Protocol) 110
NNTP ( Net work News Transport Protocol) 119
SNMP ( Sim ple Net work Managem ent Protocol) 161
SNMP trap 162
PPTP ( Point - t o-Point Tunneling Protocol) 1723
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