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TA 850 User Manual © 2001, ADTRAN, Inc.
61200375L1-1
TA 850
T1 RCU VoATM UIG/61200376L2-31A
Page 42 of 72
NAT
Use this menu to set up and use Network Address Translation on this interface.
N
ETWORK
A
DDRESS
P
ORT
T
RANSLATION
By enabling port translation, IP packets are modified
as they pass through this interface. During transmis-
sion, 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. Once enabled, you must
set up NAT for use.
P
UBLIC
IP A
DDRESS
M
ODE
The port translation requires at least a single real IP
address for translating. This value can use the IP as-
signed to the interface (or assigned via layer 2 proto-
col like PPP), obtained using DHCP client, or
statically specifiedon thismenu. If theaddress cannot
be learned, then it must be specified in order for the
translation to work.
T
RANSLATION
T
ABLE
Add translation entries to "fine tune" special proto-
cols or specify private addresses.
PUBLIC ADDRESS
M
ODE
The public IP address used for this translation
entry can be the NAPT IP address assigned to the
link or can be specified. You specify anaddress to
direct packets with certain protocols to different
servers.
P
ROTOCOL
The upper layer protocol that is to be monitored
for translation. For TCP and UDP, a port number
must also be specified.
P
UBLIC
P
ORT
M
ODE
The public destination port associated with this
entry can be specified to add more control over
certain types of traffic. The default, A
NY
P
ORT
,
covers all port types.
P
RIVATE
A
DDRESS
M
ODE
The private IP address can be specified to steer
certain protocols and ports to specific servers in
the private network. Likewise, internal hosts can
be steered to certain servers on the public
network. A new request from the public network
matching this entry’s public parameters will be
dropped if this mode is set to A
NY
I
NTERNAL
.
P
RIVATE
P
ORT
M
ODE
The private destination port associated with this
entry can be specified to add more control over
certain types of traffic. Leave as A
NY
P
ORT
to
cover all port types.
T
RANSLATE
B
ODY
By default, the application payload in the packet
is scanned for occurrences of the private/public IP
addressin binary or ASCIIform. Set this to
No
for
applications where this will cause problems.
NAT V
IEW
Shows the protocols that are actively being translated.