Vigor3900 Series User’s Guide
162
E
E
x
x
a
a
m
m
p
p
l
l
e
e
1
1
:
:
H
H
o
o
w
w
t
t
o
o
S
S
e
e
t
t
u
u
p
p
A
A
d
d
d
d
r
r
e
e
s
s
s
s
M
M
a
a
p
p
p
p
i
i
n
n
g
g
b
b
y
y
U
U
s
s
i
i
n
n
g
g
P
P
o
o
l
l
i
i
c
c
y
y
R
R
o
o
u
u
t
t
e
e
Address mapping is used to map a specified private IP or a range of private IPs of NAT
subnet into a specified WAN IP (or WAN IP alias IP). Refer to the following figure.
Suppose the WAN settings for a router are configured as follows:
WAN1: 202.211.100.10, WAN1 alias: 202.211.100.11
WAN2: 203.98.200.10
Without address mapping feature, when a NAT host with an IP say "192.168.1.10" sends a
packet to the WAN side (or the Internet), the source address of the NAT host will be mapped
into either 202.211.100.10 or 203.98.200.10 (which IP or mapping is decided by the internal
load balancing algorithm).
With address mapping feature, you can manually configure any host mapping to any WAN
interface to fit the request. In the above example, you can configure NAT Host 1 to always
map to 202.211.100.10 (WAN1); Host 2 to always map to 202.211.100.11 (WAN1 alias);
Host 3 always map to 203.98.200.10 (WAN2) and Group 1 to always map to 202.211.100.10
(WAN1).
NAT Address Mapping function lets you specify the outgoing IP address(es) for one internal
IP address or a block of internal IP addresses.
We will take an example to introduce how to make use of this feature.
1.
Log into the web user interface of Vigor3900.
VoIPon www.voipon.co.uk sales@voipon.co.uk Tel: (0)330 088 0195 Fax: +44 (0)1245 808299
