Chapter 11 Network Address Translation (NAT)
VMG1312-B Series User’s Guide
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The following t able describes t he fields in t his screen.
11.8 Technical Reference
This part cont ains m ore inform ation regarding NAT.
11.8.1 NAT Definitions
I nside/ outside denot es where a host is located relative t o the Device, for exam ple, the com puters
of your subscribers are the inside host s, while the web servers on t he I nt ernet are the outside
host s.
Global/ local denotes t he I P address of a host in a packet as t he packet traverses a rout er, for
exam ple, t he local address refers t o t he I P address of a host when t he packet is in the local
net work, while the global address refers t o the I P address of the host when t he sam e packet is
traveling in t he WAN side.
Table 60 Address Mapping: Add/ Edit
LABEL DESCRIPTION
Type Choose t he I P/ port m apping type from one of t he following.
One- t o- One: This m ode m aps one local I P address t o one global I P address. Note t hat port
num bers do not change for the One- t o- one NAT m apping t ype.
Ma ny- t o- One : This m ode m aps m ult iple local I P addresses to one global I P address. This is
equivalent t o SUA ( i.e., PAT, port address t ranslation) , the Device's Single User Account
feature t hat previous routers support ed only.
Ma ny- t o- Many: This m ode m aps m ult iple local I P addresses to shared global I P addresses.
Local St art I P
Ent er t he st arting I nside Local I P Address ( I LA).
Local End I P Enter the ending I nside Local I P Address ( I LA). I f t he rule is for all local I P addresses, then
this field displays 0.0.0.0 as t he Local St art I P address and 255.255.255.255 as t he Local
End I P address. This field is blank for On e - to- One m apping types.
Global St art I P Enter the start ing I nside Global I P Address ( I GA) . Ent er 0.0.0.0 here if you have a dynam ic
I P address from your I SP. You can only do t his for the M a ny- t o- One m apping t ype.
Global End I P Enter the ending I nside Global I P Addr ess ( I GA). This field is blank for One - t o- On e and
Ma ny- t o- One m apping types.
Set Select the num ber of t he m apping set for which you want t o configure.
OK Click OK to save your changes.
Cancel Click Cancel t o ex it this screen wit hout saving.
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