I'm running Sunbelt firewall on my laptop. I just moved into a new place and I'm using my landlord's wireless router. He manages the router. Everything was fine for a couple weeks but recently my internet speed has slowed. A couple days ago the firewall started noting ICMP L3retriever pings coming from my landlord's computer. What's he doing that I'm suddenly getting these pings? Is it a form of attack? I've been on shared wireless networks before but have never encountered this.