Continued probing with source IP 10.x.x.x

[Damon McMahon]

Greetings,

My firewall logs are recording repeated hits on 110/tcp (POP3) from what I 
believe is a privately-assigned IP address - 10.128.108.4. All of these hits 
have the ACK flag set, some of them have combinations of the PUSH, RST or 
SYN flags set too.

I have a POP server on our network but it services internal requests from 
our internal 192.168.0.0/24 subnet only.

We have a dynamic public IP address, but this phenomenon is spanning DHCP 
reassignments of this address.

Is this a simple port scan from outside, or should I be more worried?

Any assistance or advice will be appreciated!

Damon

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