Tracking down IP's

[JD Kitch <adahma@gmx.net>]

Can anyone tell me what this person is looking for here, and how I
can find out where this is coming from?

Security Violations
=-=-=-=-=-=-=-=-=-=
Dec 31 11:06:47 tower kernel: Packet log: output REJECT eth0 PROTO=17 xx.xx.xxx.xx:61662 172.16.72.113:161 L=106 S=0x00 I=7632 F=0x0000 T=127 (#43)
Dec 31 11:06:53 tower kernel: Packet log: output REJECT eth0 PROTO=17 xx.xx.xxx.xx:61662 172.16.72.113:161 L=106 S=0x00 I=7712 F=0x0000 T=127 (#43)
Dec 31 11:06:59 tower kernel: Packet log: output REJECT eth0 PROTO=17 xx.xx.xxx.xx:61662 172.16.72.113:161 L=106 S=0x00 I=7713 F=0x0000 T=127 (#43)
Dec 31 11:07:06 tower kernel: Packet log: output REJECT eth0 PROTO=17 xx.xx.xxx.xx:61662 172.16.72.113:161 L=106 S=0x00 I=7716 F=0x0000 T=127 (#43)
Dec 31 11:07:13 tower kernel: Packet log: output REJECT eth0 PROTO=17 xx.xx.xxx.xx:61662 172.16.72.113:161 L=106 S=0x00 I=7724 F=0x0000 T=127 (#43)
Dec 31 11:07:19 tower kernel: Packet log: output REJECT eth0 PROTO=17 xx.xx.xxx.xx:61662 172.16.72.113:161 L=106 S=0x00 I=7725 F=0x0000 T=127 (#43)

I've been unable to track it down.  I've had pages and pages of this
every hour since early yesterday, always coming from the same IP, to
the same port.

TIA,
jdk