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Is there a way to see when iptables was last changed?

I'm running CentOS5. I found this morning that the configuration is different from what I set 6 months ago.

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I don't know if there is a way, but I use a custom chain to setup the iptables activation date, like so:

DATE_AND_TIME=`date +"%d-%m-%y_%H-%M-%S"`
iptables -N X_DATE_$DATE_AND_TIME

Note: I have started the custom chain with x to be the last chain.

To print the last activation date:

iptables -L -n -v | grep X_DATE

It will print something like:

Chain X_DATE_13-02-14_11-36-05 (0 references)

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