Nokia T66280 User Manual

Page 20

C33906002SE_00

single VCC IP address to the public network. The principle of Network
Address Port Translation is presented in Figure 15.

NAPT router

192.168.1.254

195.1

12.12.161

src:192.168.1.112:1228
dst:194.112.11.111:80

src:194.112.11.111:80

dst:192.168.1.112:1228

src:195.112.12.161:50001

dst:194.112.11.111:80

src:194.112.11.111:80

dst:195.112.12.161:50001

Home network (LAN)

Internet (WAN)

Figure 15

Principle of Network Address Port Translation

NAPT may restrict the operation of some IP applications. NAPT also
operates as a simple IP firewall because translation is only allowed
when the first packet is transmitted from the LAN. This means that the
NAPT table entry is created only when a packet is sent from the home
network to the Internet. With server support capability, the user can
add static entries to the NAPT table allowing the translation always in
both directions. This capability is used to add servers (HTTP, NNTP,
and FTP), which are visible to the public IP network via the VCC, on
the LAN subnet.

NAPT supports most IP-based protocols. Because NAPT operates on
the IP and transport layer, the application that includes IP address and
port within the payload will not work properly through NAPT. In many
cases, these applications can be passed through the NAPT using
Application Layer Gateway functionality (ALG). M1122 has ALG for
the following protocols/applications:

ICMP

FTP

H.323 including NetMeeting

CUSeeMe

PPTP

IRC

IPSEC ESP tunnel mode and IKE

Note, that most IPSEC implementations will fail when passed through
NAPT. A typical reason is that the identification may fail if the
identification is based on IP address. Also, only tunnel mode without
Authentication Header (AH) works.