ZyXEL Communications VMG1312-B Series User Manual page 191

For exam ple:
Figure 77 Trigger Port Forwarding Process: Exam ple
1 Jane request s a file from t he Real Audio server ( port 7070) .
2 Port 7070 is a " t rigger " port and causes t he Device t o record Jane's com put er I P address. The
Device associat es Jane's com put er I P address wit h t he " open" port range of 6970- 7170.
3 The Real Audio server responds using a port num ber ranging bet ween 6970- 7170.
4 The Device forwards t he t raffic t o Jane's com put er I P address.
5 Only Jane can connect t o t he Real Audio server unt il t he connect ion is closed or t im es out . The
Device t im es out in t hree m inut es wit h UDP ( User Dat agram Prot ocol) or t wo hours wit h TCP/ I P
( Transfer Cont rol Prot ocol/ I nt ernet Prot ocol) .
Click N e t w or k Se t t ing > N AT > Por t Tr igge r ing t o open t he following screen. Use t his screen t o
view your Device's t rigger port set t ings.
Figure 78 Net work Set t ing > NAT > Port Triggering
The following t able describes t he labels in t his screen.
Table 55 Net work Set t ing > NAT > Port Triggering
LABEL
Add new rule
#
St at us
Service Nam e
WAN I nt erface
Trigger St art
Port
Trigger End
Port
Trigger Prot o.
VMG1312-B Series User's Guide
DESCRIPTION
Click t his t o creat e a new rule.
This is t he index num ber of t he ent ry.
This field displays whet her t he port t riggering rule is act ive or not . A yellow bulb signifies
t hat t his rule is act ive. A gray bulb signifies t hat t his rule is not act ive.
This field displays t he nam e of t he service used by t his rule.
This field show s t he WAN int erface t hrough which t he service is forwarded.
The t rigger port is a port ( or a range of port s) t hat causes ( or t riggers) t he Device t o record
t he I P address of t he LAN com put er t hat sent t he t raffic t o a server on t he WAN.
This is t he first port num ber t hat ident ifies a service.
This is t he last port num ber t hat ident ifies a service.
This is t he t rigger t ransport layer prot ocol.
Chapter 11 Network Address Translation (NAT)
191