We have a Cisco IPS device in monitoring mode, monitoring 2 segments of traffic via spanned ports on two different 3750-x switches (inside and DMZ). After a period of say 2-3 hours the ports just stop passing traffic to the IPS device. To check there still is traffic we have a laptop connected on another port running wireshark and the port connected to the laptop never fails. I need to remove and re-add the span port config in order for the traffic to start flowing to our Cisco IPS again. I am not able to see in your syslog and reason for this.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...