Generate the required traffic using the NMAP application you can get the alert Messages from the router itself , Please make use of the SDEE messages which will give the Complete info of the alerts generated , eg :: ip ips sdee alerts ip ips sde...
1)Check the Connectivity between the router and the Computer2) Try Telnet Between the router and the computer3) Enable the HTTP Service on the router using the following command in the CLI"IP HTTP Server " in the config modeGood Luck
There is nothing to do with the fragmentation ,Size of the Framents should be Equal or Less than MTU size, nothing moreCan you explain the issue which you face with it