P-2000W_V2 User’s Guide
86
Chapter 12 User Web Configurator Screens
Figure 22
Full Cone NAT Example
12.11.2.2 Restricted Cone NAT
As in full cone NAT, a restricted cone NAT router maps all outgoing packets from an internal
IP address and port to a single IP address and port on the external network. In the following
example, the NAT router maps the source address of all packets sent from internal IP address
1
and port
A
to IP address
2
and port
B
on the external network.
The difference from full cone NAT is in how the restricted cone NAT router handles packets
coming in from the external network. A host on the external network (IP address
3
or IP
address
4
for example) can only send packets to the internal host if the internal host has
already sent a packet to the external host’s IP address.
A Prestige with IP address
1
and port
A
sends packets to IP address
3
and IP address
4
. The
NAT router changes the Prestige’s IP address to
2
and port to
B
.
Both
4, D
and
4, E
can send packets to
2
,
B
since
1
,
A
has already sent packets to
4
. The NAT
router will perform NAT on the packets from
4, D
and
4, E
and send them to the Prestige at IP
address
1
, port
A
. Packets have not been sent from
1
,
A
to
3
or
5
, so
3
and
5
cannot send
packets to
1
,
A
.
Figure 23
Restricted Cone NAT Example
Summary of Contents for PRESTIGE 2000W V2
Page 1: ...P 2000W_V2 VoIP Wi Fi Phone User s Guide Version WV 00 01 6 2005...
Page 2: ......
Page 5: ...P 2000W_V2 User s Guide Federal Communications Commission FCC Interference Statement 5...
Page 10: ...P 2000W_V2 User s Guide 10 Customer Support...
Page 16: ...P 2000W_V2 User s Guide 16 Table of Contents...
Page 28: ...P 2000W_V2 User s Guide 28 Chapter 1 Getting To Know Your Prestige...
Page 32: ...P 2000W_V2 User s Guide 32 Chapter 2 Using the LCD Screen Menus...
Page 40: ...P 2000W_V2 User s Guide 40 Chapter 3 Wireless LAN Setup Menus...
Page 50: ...P 2000W_V2 User s Guide 50 Chapter 5 SIP Settings...
Page 64: ...P 2000W_V2 User s Guide 64 Chapter 8 Miscellaneous Settings...
Page 72: ...P 2000W_V2 User s Guide 72 Chapter 11 Using the Web Configurator Screens...
Page 108: ...P 2000W_V2 User s Guide 108 Chapter 14 Troubleshooting...
Page 118: ...P 2000W_V2 User s Guide 118 Appendix B IP Subnetting...
Page 126: ...P 2000W_V2 User s Guide 126 Appendix D Wireless LANs...
