Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

PAT does not work after a period of time

Core Issue

Both Network Address Translation (NAT) and Port Address Translation (PAT) are configured on the C1750 router and both work normally.

However, after 6 to 12 hours of operation, the PAT fails. No new PAT session can be established.

Power cycling the router makes PAT work again, but the problem occurs again after several hours.


To resolve this issue, refer to the First Fixed-In Version column in Cisco bug ID CSCdv25204. This provides a list of Cisco IOS  Software versions that do not exhibit this problem.

To download these Cisco IOS Software versions, refer to Cisco Downloads.

Version history
Revision #:
1 of 1
Last update:
‎06-18-2009 03:57 PM
Updated by:
Labels (1)
Everyone's tags (3)