One of my clients moved two of their email devices to a DMZ. The both produce alerts on the mass mailing worm alert. Before they were moved to the DMZ, you would see the alert and it would have a source and destination IP. Now it only has the destination IP address of where the device is sending email to. Since the MARS does not pick up the devices new IP address, I cannot false positive tune these alerts out. How would I go about fixing this issue?
When the IDS mistakenly thinks that normal traffic is malicious then false positives happen To reduce them you have to fine tune the system by letting it know what normal traffic means on your network.
Cisco has provided some great guidance on how to reduce false positives here:
Login to the FXOS chassis manager.
Direct your browser to https://hostname/, and log-in using the user-name and password.
Go to Help > About and check the current version:
Check the current version availa...
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...