With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cagwUserGrpInvalidSourcePacketsDrops
Cisco's ASN Gateway User Group Invalid Source Packets Drops
1.3.6.1.4.1.9.9.638.1.3.4.1.1.13
Number of packets dropped due to invalid source address.
Back to CISCO-ASN-GATEWAY-MIB MIB page.
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