How can I track the cause of this...

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http://www.linuxquestions.org – I've recently been provided with a Technicolor 582n router. Not a very impressive bit of hardware, but I'm stuck with it for a while. Since I wasn't very confident in the quality of its firewall, I've set it to log to the syslog on my server. I've got port 22 open to allow me SSH access from the internet (set to use keys only), so I'm a bit wary of possible breaches. I've also set up dynamic dns server (using no-ip.com) so I can find the system if its IP changes. Looking through the router logs, I see quite a large number of attempted port scans. Generally they seem fairly harmless. However, (HowTos)