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I received this email alert from my network sensor. The information about
this
alert given by RealSecure is that attackers use non-standard protocol so
that they go undetected.  I replaced the real IP with x.x.x.x.
The advise was to check the type of protocol. In this case it's protocol: 54
NARP
Does anyone have any idea on this type of alert ??

Thanks,
Jaime






'IPUnknownProtocol' event detected by the RealSecure sensor at 'realsecure'.
Details:
        Source Address: 169.237.30.199
        Source Port: 
        Source MAC Address: 08:00:02:2A:7C:CD
        Destination Address: x.x.x.x
        Destination Port: 
        Destination MAC Address: xx:xx:xx:xx:xx:xx
        Time: Thursday, July 12, 2001 01:07:18
        Protocol: NARP (54)
        Priority: high
        Actions mask: 0x244
        Event Specific Information:
                PROTOCOL: 54 (NARP)


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