3com 812 Manual De Usuario
6-24
C
HAPTER
6: M
ANUAL
S
ETUP
Configuring NAT Static and Dynamic Mappings
If you do not configure static or dynamic mappings for NAT (even if they have a
default PAT address), the following error message displays on the CLI console
when you enable the vc:
default PAT address), the following error message displays on the CLI console
when you enable the vc:
When Network Address Translation (NAT, RFC 1631) is enabled, Static Addresses and/or Dynamic
pool addresses must be configured.
pool addresses must be configured.
To configure static mappings for NAT, enter the following command:
add nat static <vc name> public_address <ip address> private_address
<ip address>
<ip address>
To configure dynamic mappings for NAT, enter the following command:
add nat dynamic <vc name> public_address <starting ip address> count
<size of address pool>
<size of address pool>
Do not use the public WAN port IP address of the OfficeConnect 812 as one of
the NAT static or dynamic public IP addresses.
the NAT static or dynamic public IP addresses.
Monitoring NAT
The NAT configuration is displayed when viewing the remote site configuration
using the show vc command.
using the show vc command.
The Network Address Translation field should indicate “RFC 1631 (NAT)”.
The NAT Default Address field will contain the PAT default address if the option
is disabled, or a valid workstation IP address on the local LAN if it is enabled.
is disabled, or a valid workstation IP address on the local LAN if it is enabled.
The static and/or dynamic address definitions are appended to the display only
when configured.
when configured.
When the remote site is active, current port mappings and address mappings
are displayed with the following commands, respectively:
are displayed with the following commands, respectively:
list nat vc <vc name> port
list nat vc <vc name> addr
Super Network Address
Translation (Super NAT)
Typically, the user must decide when to use NAT and when to use PAT, and
switching between address translation modes must then be performed manually
(by the user) as changing network conditions warrant. By contrast, with Super NAT
enabled on the OCR 812, the system (not the user) automatically determines
when it is best to use NAT, and conversely, when it is best to use PAT. Super NAT
makes optimal use of available IP Addresses by enabling the system to
automatically switch between PAT and NAT when multiple public addresses are
assigned to the site.
switching between address translation modes must then be performed manually
(by the user) as changing network conditions warrant. By contrast, with Super NAT
enabled on the OCR 812, the system (not the user) automatically determines
when it is best to use NAT, and conversely, when it is best to use PAT. Super NAT
makes optimal use of available IP Addresses by enabling the system to
automatically switch between PAT and NAT when multiple public addresses are
assigned to the site.
Configuring Super NAT
You can configure NAT, PAT, or both NAT and PAT.
To use Super NAT, the system must first be configured to use both NAT and PAT,
and Super NAT must then be enabled.
and Super NAT must then be enabled.
The user is not required to add static or dynamic mappings for Super NAT. If no
mappings are configured, the address translation mode will automatically be set
to PAT.
mappings are configured, the address translation mode will automatically be set
to PAT.