Can I get alerted if my router is hit with a DoS or Scan?

Hi,
I have a Cisco 877. I have IPS installed and mondered how or if I could be alerted when it's constantly scanned by an external IP?
I have seen my syslog server fill up with deny's from external IP's and wondered if I can be notified, or is it regarded as the router is doing it's job so don't worry?
Thanks in advance for your info

Hi,
Not sure if this works on an 877 (I don't have one) but this might be a good start:-
http://blog.ioshints.info/2007/11/send-e-mail-when-interface-goes-down.html
You'll need to change the syslog pattern to something more appropriate.

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