21-4
C
HAPTER
21: A
DDRESS
T
RANSLATION
C
OMMANDS
NAT CLI Commands
add nat static
<name>
interface
<name>
public_address
<ip_
address_range>
private_address
<ip_
address_range>
Use this command to configure static NAT assignments:
add nat static
<name>
interface
<name>
public_address
<ip_address_range>
private_address
<ip_address_range>
add nat dynamic
<name>
interface
<name>
public_address
<ip_
address_range>
private_address
<ip_
address_range>
Use this command to configure a NAT public pool:
add nat dynamic
<name>
interface
<name>
public_address
<ip_address_range>
private_address
<ip_address_range>
Intelligent NAT
There are some applications which initiate connections from the client on the local
LAN but also initiate additional connections from the remote host. For example, a
client on the local LAN initiates a Transmission Control Protocol (TCP) connection
to a remote host. The application on the remote host then starts sending User
Datagram Protocol (UDP) frames containing video and audio content.
The address translator dynamically establishes a mapping between the public port
number and the IP address of the local LAN client when the initial TCP connection
was initiated. With this established mapping, all frames from the remote host can
be mapped back to the local LAN client's private address. However, the UDP
connection/stream, initiated from the remote host, does not have an existing port
mapping. When received, the translator does not know for certain which client on
the local LAN the frame should be directed to unless it has knowledge of the
application itself.
The OffiiceConnect Gateway has several features which attempt to make these
applications work. They are
Intelligent NAT
and the
Default Workstation
.
Intelligent NAT
directs the frame to the local client which currently has other
existing connection(s) with the remote host. If more than one local client has
existing connections, then the client who initiated the most recent session is
chosen. The
Default Workstation
, if configured, is used when
Intelligent NAT
fails to find a local client to direct the frame to.
Default Workstation
is
configured with the private address of a client on the local LAN. This client address
typically is the workstation that is used for telecommuting or internet gaming.
The OffiiceConnect Gateway can also be configured to enable access to servers on
the local LAN. If only one server is to be accessible, then
Default Workstation
can be used.
Содержание OfficeConnect 3C100XF
Страница 1: ...http www 3com com OfficeConnect Gateway CLI User s Guide Release 1 0 Part No 10042302 Rev AA ...
Страница 14: ...xiv ...
Страница 18: ...iv ABOUT THIS GUIDE ...
Страница 30: ...1 12 CHAPTER 1 USING THE COMMAND LINE INTERFACE CLI ...
Страница 50: ...3 14 CHAPTER 3 ADMINISTRATIVE CLI COMMANDS ...
Страница 58: ...4 8 CHAPTER 4 CONFIGURING AND MANAGING USERS ...
Страница 70: ...6 8 CHAPTER 6 BRIDGING COMMANDS ...
Страница 78: ...8 4 CHAPTER 8 INTERFACE COMMANDS ...
Страница 82: ...9 4 CHAPTER 9 ARP COMMANDS ...
Страница 88: ...11 4 CHAPTER 11 DHCP COMMANDS ...
Страница 124: ...12 36 CHAPTER 12 IP ROUTING COMMANDS ...
Страница 134: ...13 10 CHAPTER 13 DNS COMMANDS ...
Страница 142: ...15 6 CHAPTER 15 MULTICASTING AND IGMP COMMANDS ...
Страница 160: ...17 8 CHAPTER 17 PPP COMMANDS ...
Страница 182: ...21 6 CHAPTER 21 ADDRESS TRANSLATION COMMANDS ...
Страница 186: ...22 4 CHAPTER 22 IPSEC COMMANDS ...
Страница 188: ...23 2 CHAPTER 23 SECURITY ASSOCIATION SA COMMANDS ...
Страница 192: ...24 4 CHAPTER 24 TCP COMMANDS ...
Страница 204: ...25 12 CHAPTER 25 SNMP COMMANDS ...
Страница 210: ...26 6 CHAPTER 26 IP FILTERS COMMANDS ...
Страница 238: ...29 6 CHAPTER 29 TRACEROUTE COMMANDS ...
Страница 255: ...xv RFC 1483 16 3 RFC 1483 MER 16 4 ...
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