# ip nat translation

#### Syntax

ip nat translation { timeout | udp-timeout | dns-timeout | tcp-timeout | first-timeout
|icmp-timeout | gre-timeout } seconds

no ip nat translation { timeout | udp-timeout | dns-timeout | tcp-timeout | first-timeout |icmp-timeout | gre-timeout}

#### Release Information

Command introduced before JunosE Release 7.1.0.
gre-timeout keyword added in JunosE Release 7.3.0.

#### Description

Changes or disables translation timeouts, per virtual router, for existing and newly created translations in the translation table. All timeouts for this command support a range of 1–2147483 seconds (about 25 days). The no version enables the timer using its default value.

| Note: GRE translations are used as optimizations to discard GRE traffic. You can use the gre-timeout keyword to control GRE aging timeout, even though we do not support NAPT for GRE. The GRE aging timer has no effect on any simple translations GRE might use.

#### Options

- timeout—Sets aging time for dynamic translations (except for overloaded translations); default value is 86400 seconds (24 hours)
- udp-timeout—Sets aging time for UDP protocol translations; default value is 300 seconds (5 minutes)
- dns-timeout—Sets aging time for DNS protocol translations (port 53 on TCP or UDP); default value is 60 seconds
- tcp-timeout—Sets aging time for TCP protocol translations; default value is 86400 seconds (24 hours)
- first-timeout—Sets aging time for TCP connections terminated with RST or FIN flags; default value is 60 seconds
- icmp-timeout—Sets aging time for ICMP protocol translations; default value is 300 seconds (5 minutes)
- gre-timeout—Sets aging time for GRE protocol translations; default value is 300 seconds (5 minutes)
- seconds—Number of seconds before the router removes an unused NAT table entry

#### Mode

Global Configuration