HP FlexNetwork MSR2003 User Manual

126
Figure 60 NAT Server operation
Figure 60 displays how NAT Server works:
1. Upon receiving a request from the host, NAT translates the public destination IP address and
port number to the private IP address and port number of the internal server.
2. Upon receiving a response from the server, NAT translates the private source IP address and
port number to the public IP address and port number.
DS-Lite NAT444
DS-Lite combines tunneling and NAT to allow an IPv4 private network to access the IPv4 public
network over an IPv6 network. For more information about DS-Lite, see "Configuring tunneling."
DS-Lite NAT444 is configured on the AFTR and performs dynamic NAT444 based on the B4 element.
The B4 element refers to a B4 router or a DS-Lite host. DS-Lite NAT444 dynamically maps a public
IPv4 address and a port block to the IPv6 address of the B4 element. The DS-Lite host or hosts
behind the B4 router use the mapped public IPv4 address and port block to access the public IPv4
network.
DS-Lite NAT444 supports user tracing for DS-Lite hosts based on the port block.
Figure 61 DS-Lite NAT444
NAT entries
NAT session entry
NAT creates a NAT session entry for a session and creates an address mapping for the first packet in
the session.
A NAT session entry contains extended NAT information, such as interface and translation method.
Subsequent packets of the session are translated by using this entry.
192.168.1.3
192.168.1.1 20.1.1.1
20.1.1.2
NAT
Intranet
Internet
Host
Server
Dst : 20.1.1.1:8080Dst : 192.168.1.3:8080
Src : 192.168.1.3:8080
Src : 20.1.1.1:8080
Before NAT
20.1.1.1:8080
After NAT
192.168.1.3:8080
Direction
Inbound
IPv4 network
Host
NAT gateway
Log server
Application
server
B4 AFTR
IPv6 network
DS-Lite tunnel
D
S
-
L
i
t
e
t
u
n
n
e
l
DS-Lite host

HP FlexNetwork MSR2003 Specifications

General

Brand	HP
Model	FlexNetwork MSR2003
Category	Network Router
Language	English