Cisco Systems 2.5 Designate NAT Interfaces, Translation Timeout Settings

Chapter26 Network Address Translation
Network Address Translation Rules
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Cisco Router and Security Device Manager 2.5 User’s Guide
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Designate NAT Interfaces
Use this window to designate the inside and outside interfaces that you want to
use in NAT translations. NAT uses the inside and outside designations when
interpreting translation rules, because translations are performed f rom inside to
outside, or from outside to inside.
Once designated, these interfaces are used in all NAT translation rules. The
designated interfaces appear above the Translation Rules list in the main NAT
window.
Interface
All router interfaces are listed in this column.
Inside (trusted)
Check to designate an interface as an inside interface. Inside interfaces typically
connect to a LAN that the router serves.
Outside (untrusted)
Check to designate an interface as an outside interface. Outside interfaces
typically connect to your organization’s WAN or to the Internet.
Translation Timeout Settings
When you configure dynamic NAT translation rules, translation entries have a
timeout period after which they expire and are purged from the translation table.
Set the timeout values for various translations in this window.
DNS Timeout
Enter the number of seconds after which connections to DNS servers time out.
ICMP Timeout
Enter the number of seconds after which Internet Control Me ssage Protocol
(ICMP) flows time out. The default is 60 seconds.