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nbar and ipsec traffic

Hello gurus!

I have a question about nbar because I'm applying protocol-discovery on my internal interface (just internal interface) but when I type show ip nbar protocol-discovery appears (only as a output) that there are IPSEC traffic.

Why I see ipsec traffic through this interface if  all tunnels are well configured and working??

I have check with a sniffer and no ipsec traffic through this interface....

If you have any idea why I see this traffic should be very useful...

Albert.

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