ADTRAN TOTAL ACCESS 600R, System Manual

Page: 88 / 196

Section 4 User Interface Guide Total Access 600R System Manual
88 © 2002 ADTRAN, Inc. 61200600L1-1A
MTU
(This option is not available if the
L2 P
ROTOCOL
is set to
PPP
.) The Maximum Transmission Unit
(MTU) is the largest possible data unit that can be transmitted. The range is
64
to
1500
. The default is
1500
.
NAT
The unit can perform Network Address Translation (NAT). This feature is most widely used when
connecting to the Internet. The Ethernet network can consist of private network numbers. When this
profile is enabled, all IP addresses on the Ethernet side are translated into the one real IP address.
Multiple stations on the Ethernet side can access the Internet simultaneously.
P
ORT
T
RANSLATION
By enabling
P
ORT
T
RANSLATION
, IP packets are modified as they pass through this interface.
During transmission, private addresses are translated into a single public (NAPT) IP address.
Incoming packets are translated from the public to private address based on the protocol port
numbers. Default is
D
ISABLED
.
When disabled, the unit will route across the connection normally.
P
UBLIC
IP A
DDRESS
M
ODE
(This option is only available when NAT P
ORT
T
RANSLATION
is enabled.) The port translation
requires at least a single real IP address for translating. This value can use the IP assigned to the
interface (or assigned via layer 2 protocol like PPP), obtained using DHCP client, or statically
specified on this menu. If the address cannot be learned, it must be specified in order for the
translation to work. Choices are
I
NTERFACE
, S
PECIFIED
,
and
DHCP C
LIENT
.
Default is
I
NTERFACE
.
P
UBLIC
IP A
DDRESS
(This option is only available when NAT P
ORT
T
RANSLATION
is enabled and the P
UBLIC
IP
A
DDRESS
M
ODE
is set to
S
PECIFIED
.) This is the specified address used as the NAT address.
Default is
0.0.0.0.
T
RANSLATE
B
ODY OF
U
NMAPPED
P
ORTS
If this option is set to
D
ISABLED
, the user must add an entry in the translation table for every port
which needs to be translated. If set to
E
NABLED
, every port will be translated. The default is
D
ISABLED
, which is sufficient for most circuits.
T
RANSLATION
T
ABLE
(This option is only available when NAT P
ORT
T
RANSLATION
is enabled.) Add translation
entries to specify port address translations or to setup 1:1 translations.