How can I stop unidentified communication between my iMac and internet?

Two days ago, I replaced the hard drive on my 17" Intel iMac Model A1208 EMC 2114, reinstalled 10.6, and performed all the updates indicated by Software Update to bring my installation up to Mac OS X 10.6.8 (10K549). This includes Java for Mac OS X10.6 Update 17. I do not have a security suite installed because the Symantec Enpoint Protection I was using was provided by my university because I recently graduated and attempts to update got me "license expired" notices. It took me about a day to realize the Firewall was not on. Yesterday, I noticed this traffic (revealed with Terminal command: sudo lsof |grep TCP | grep ESTAB)
java       484           root   30u     IPv6 0x08d7bbb0       0t0      TCP [::192.168.1.2]:49501->[::204.17.140.11]:http (ESTABLISHED)
I used Network Utility Whois to find that 192.168.1.2 is...
192.168.1.2
192.168.1.2.TPGI.COM.AU
192.168.1.254.OPTIMUSENLINEA.COM.RCOM-DNS.EU
NS3.HOSTSAVE.COM.IMPERIALPARTSANDCARS.COM.NS-NOT-IN-SERVICE.COM
NS2.HOSTSAVE.COM.IMPERIALPARTSANDCARS.COM.NS-NOT-IN-SERVICE.COM
This traffic is using up my bandwidth.
Can anyone tell me what this traffic might be?
Please tell me how to terminate this traffic by some other means than turning off my computer.
I hope my machine has not become a spambot.

Ok, thanks. I ended up reinstalling the system anyway to remedy some other things, and the very first thing I did after re-installing 10.6 was to put up the firewall and shut Java off. I imported many fewer items from my backup with Migration Assistant to to ensure a "cleaner" install. I haven't seen the same traffic again, but I suppose I might in the future. I was under the impression that Apple did infrequent "bulk" updates to Java and since I had already installed the latest update as it appeared in Software Update, I was not expecting any other kind of update, and especially not some surreptitious-looking background update from an IP I could not associate with Apple.
Yes, Anchortown is Anchorage, Alaska (there is also Anchorage, Kentucky). We had our first measurable snowfall today (at near sea-level).

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