in my lan i see valid source IP addresses try to reach a invalid source IP addresses which is not available in the LAN.
for example in my firewall log
Deny inbound UDP from 172.16.1.3/1042 to 172.17.10.3/161 on interface inside
172.16.1.3 is valid but 172.17.10.3 is invalid or non existent
can you help create a acces list or packet drop config in switch so that this packet does not reach the firewall
Use you own names interfaces etc, but something along these lines.
ip access-list extended YOURLIST
deny udp host 172.16.1.3 eq 1042 host 172.17.10.3 eq 161
permit ip any any
interface vlan 16
ip address 172.16.1.1 255.255.255.0
ip access-group YOURLIST in
By the way UDP port is used for SNMP.
Looks like your device is trying to contact an snmp server.
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BTW, an alternative to using an ACL, you might be able to route bad packets to a null interface, which also effectively drops them.