D-Link DI-1750 Reference Manual page 177

See the "TCP Load Distribution Example" section at the end of this chapter for an example of rotary
translation.
6.3.13 Changing Translation Timeout and Restrict Connection Amount
By default, dynamic address translations time out after some period of nonuse. You can change the
default values on timeouts, if necessary. When overloading is not configured, simple translation entries
time out after 1 hour. To change this value, use the following command in global configure directory:
ip nat translation timeout seconds
Input ip command，it will list all arguments:
(00)access-list
......
(13)nat
......
Please Input the code of command to be excute(0-20): 13
Input 13, select nat option，prompt is as below:
(00)inside
(01)log
(02)outside
(03)pool
(04)translation
Please Input the code of command to be excute(0-4): 4
Input 4，select translation option，prompt is as below:
(00)dns-timeout
......
(06)timeout
......
Please Input the code of command to be excute(0-8): 6
Input 6，select timeout option，prompt is as below:
(00)<0-2147483647>
(01)never
Please Input the code of command to be excute(0-1): 0
Input 0，prompt is as below:
Please input a digital number:Please input a string:
Input timeout value.
If you have configured overloading, you will have more control over translation entry timeout, because
each entry contains more context about the traffic using it. To change timeouts on extended entries, use
the following commands in global configuration mode as needed:
ip nat translation udp-timeout
seconds
ip nat translation dns-timeout
seconds
ip nat translation
seconds
ip nat translation icmp-timeout
seconds
ip nat translation syn-timeout
seconds
Command
Named access-list
NAT configuration commands
Inside address translation
NAT Logging
Outside address translation
Define pool of addresses
NAT translation entry configuration
Specify timeout for NAT DNS flows
Specify timeout for dynamic NAT translations
Timeout in seconds
Never timeout
Command
tcp-timeout
Model Name
Purpose
Changes the timeout value for dynamic address translations
that do not use overloading.
Purpose
Changes the UDP timeout value from 5 minutes.
Changes the DNS timeout value from 1 minute.
Changes the TCP timeout value from 1 hour.
Changes the Finish and Reset timeout value from 1 minute.
Changes the TCP Synchronous (SYN) timeout value from 1
minute.
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