Firewall issue (Sygate)

[Ice9]

Hi, I recently discovered something very strange happening with regards to my firewall.

I use "Sygate Personal Firewall", and I noticed that when my computer was idle, I was seeing traffic being blocked in the firewall icon far more often than normal.

So I just looked in the log and I see what was going on, and I discovered 100s of hits, all from the same IP (10.x.x.x), all going to the "Destination Host" 255.255.255.255 on my machine. The rate of hits seems random, but I get about 5 per minute on average. I have a cable connection and just got a new modem from my ISP, and I think the problem has only been happening since then, but I can't be sure.

I don't think anything malicious is going on, but this can't be normal. It might be some issue between my ISP and myself, and I would appreciate any help stopping this, because it is very annoying.