Chapter 11 Network Address Translation (NAT)
VMG1312-B Series User’s Guide
191
For exam ple:
Figure 77 Trigger Port For warding Process: Example
1 Jane request s a file from the Real Audio server (port 7070).
2 Port 7070 is a “t rigger” port and causes t he Device to record Jane’s com put er I P address. The
Device associat es Jane's com puter I P address with t he "open" port range of 6970-7170.
3 The Real Audio server responds using a port num ber ranging between 6970- 7170.
4 The Device forwards the t raffic to Jane’s com put er I P address.
5 Only Jane can connect t o the Real Audio ser ver until t he connection is closed or tim es out . The
Device tim es out in t hree m inutes wit h UDP ( User Datagram Prot ocol) or t wo hours wit h TCP/ I P
( Transfer Cont rol Prot ocol/ I nternet Prot ocol).
Click N e t w ork Se t t in g > N AT > Port Tr igge ring t o open the following screen. Use t his screen to
view your Device’s trigger port set tings.
Figure 78 Net work Sett ing > NAT > Port Triggering
The following t able describes t he labels in t his screen.
Table 55 Network Sett ing > NAT > Por t Triggering
LABEL DESCRIPTION
Add new rule Click this t o creat e a new rule.
# This is the index num ber of t he ent ry.
St atus This field displays w het her t he port t riggering r ule is active or not. A yellow bulb signifies
that this rule is act ive. A gray bulb signifies that t his rule is not active.
Service Nam e This field display s t he nam e of t he service used by t his rule.
WAN I nterface This field shows t he WAN interface t hrough which the service is forwarded.
Trigger St art
Por t
The trigger port is a port ( or a range of ports) t hat causes (or t riggers) t he Dev ice to record
t he I P address of t he LAN com put er t hat sent t he traffic t o a server on the WAN.
This is t he first port num ber t hat ident ifies a service.
Trigger End
Por t
This is t he last port num ber that identifies a service.
Trigger Prot o. This is the trigger transport layer prot ocol.
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