The Alg Screen; The Address Mapping Screen - ZyXEL Communications VMG1312-B Series User Manual

Chapter 11 Network Address Translation (NAT)

11.6 The ALG Screen

Som e NAT rout ers m ay include a SI P Applicat ion Layer Gat eway ( ALG) . A SI P ALG allows SI P calls
t o pass t hrough NAT by exam ining and t ranslat ing I P addresses em bedded in t he dat a st ream .
When t he Device regist ers wit h t he SI P regist er server, t he SI P ALG t ranslat es t he Device's privat e
I P address inside t he SI P dat a st ream t o a public I P address. You do not need t o use STUN or an
out bound proxy if your Device is behind a SI P ALG.
Use t his screen t o enable and disable t he NAT and SI P ( VoI P) ALG in t he Device. To access t his
screen, click N e t w or k Se t t in g > N AT > ALG.
Figure 81 Net work Set t ing > NAT > ALG
The following t able describes t he fields in t his screen.
Table 58 Net work Set t ing > NAT > ALG
LABEL
NAT ALG
SI P ALG
Apply
Cancel

11.7 The Address Mapping Screen

Ordering your rules is im port ant because t he Device applies t he rules in t he order t hat you specify.
When a rule m at ches t he current packet , t he Device t akes t he corresponding act ion and t he
rem aining rules are ignored.
Click N e t w or k Se t t in g > N AT > Addr e ss M a ppin g t o display t he following screen.
Figure 82 Net work Set t ing > NAT > Address Mapping
194
DESCRIPTION
Enable t his t o m ake sure applicat ions such as FTP and file t ransfer in I M applicat ions work
correct ly wit h port- forwarding and address- m apping rules.
Enable t his t o m ake sure SI P ( VoI P) works correct ly wit h port- forwarding and address-
m apping rules.
Click Apply t o save your changes.
Click Ca n ce l t o rest ore your previously saved set t ings.
VMG1312-B Series User's Guide