ZyXEL Communications VMG1312-B Series, User Manual

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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 at ion regarding NAT.
11.8.1 NAT Definitions
I nside/ out side denot es where a host is locat ed relat ive t o t he Device, for exam ple, t he com put ers
of your subscribers are t he inside host s, while t he web servers on t he I nt ernet are t he out side
host s.
Global/ local denot es t he I P address of a host in a packet as t he packet t raverses 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 t he local
net work, while t he global address refers t o t he I P address of t he host when t he sam e packet is
t raveling in t he WAN side.
Table 60 Address Mapping: Add/ Edit
LABEL DESCRIPTION
Type Choose t he I P/ port m apping t ype fr om one of t he follow ing.
On e - t o- On e : This m ode m aps one local I P address t o one global I P address. Not e t hat port
num bers do not change for t he One- t o- one NAT m apping t ype.
M a n y- t o- On e : This m ode m aps m ult iple local I P addr esses t o one global I P address. This is
equivalent t o SUA ( i.e., PAT, port address t ranslat ion) , t he Device's Single User Account
feat ure t hat previous rout ers support ed only.
M a n y- t o- M a n y : This m ode m aps m ult iple local I P addresses t o shared global I P addresses.
Local St art I P Ent er t he st ar t ing I nside Local I P Addr ess ( I LA) .
Local End I P Ent er t he ending I nside Local I P Addr ess ( I LA) . I f t he r ule is for all local I P addresses, t hen
t his field displays 0.0.0.0 as t he Local St ar t I P addr ess and 255.255.255.255 as t he Local
End I P address. This field is blank for
On e - t o- On e m apping t ypes.
Global St ar t I P Ent er t he st ar t ing I nside Global I P Addr ess ( 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 t he
M a n y- t o- On e m apping t ype.
Global End I P Ent er t he ending I nside Global I P Address ( I GA) . This field is blank for On e - t o- On e and
M a n y- t o- On e m apping t ypes.
Set Select t he num ber of t he m apping set for which you want t o configure.
OK Click OK t o save your changes.
Cancel Click Ca n ce l t o exit t his screen w it hout saving.