2030 CHAPTER 133: NAT CONFIGURATION COMMANDS

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System view

Parameter

default: Restores the NAT aging time to the default value.

 

dns: Specifies the NAT aging time for DNS, which defaults to 60 seconds.

 

ftp-ctrl: Specifies the NAT aging time for FTP control link, which defaults to 7,200

 

seconds.

 

ftp-data: Specifies the NAT aging time for FTP data link, which defaults to 300

 

seconds.

 

icmp: Specifies the NAT aging time for ICMP, which defaults to 60 seconds.

 

pptp: Specifies the NAT aging time for PPTP, which defaults to 86,400 seconds.

 

tcp: Specifies the NAT aging time for TCP, which defaults to 86,400 seconds.

 

tcp-fin: Specifies the NAT aging time for TCP fin or rst, which defaults to 60

 

seconds.

 

tcp-syn: Specifies the NAT aging time for TCP syn, which defaults to 3,600

 

seconds.

 

udp: Specifies the NAT aging time for UDP, which defaults to 300 seconds.

 

seconds: NAT aging time, in the range 10 to 86,400 seconds (24 hours).

Description

Use the nat aging-timecommand to configure NAT aging time(s).

 

The Hash table used in address translation is not permanent. This command

 

configures a Hash table life time for TCP, UDP, ICMP, and other protocols

 

respectively. If the Hash table is not used within the configured time, the Hash

 

entry will become invalid. For example, when a user with IP address 10.110.10.10

 

and port number 2000 establishes an external TCP connection, NAT will assign an

 

IP address and a port number for the user. If, within a preconfigured aging time,

 

the TCP connection is not used, the system will remove it.

Example

# Configure the NAT aging time for TCP to be 240 seconds.

 

<Sysname> system-view

 

[Sysname] nat aging-time tcp 240

nat alg

Syntax nat alg { dns ftp ils nbt pptp }

undo nat alg { dns ftp ils nbt pptp }

View System view

Parameter dns: Supports DNS.

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