Our company maintains over 1000 managed 3Com 3C16406 24-port 10BaseT shared hubs and have for a few years now. They have worked very well for us but since last Friday (09/14/2001), random hubs on different subnets in different buildings more than likely under different traffic loads have stopped answering pings. The users on the hubs seem to be working fine but the IP management on the hubs won't answer to pings. Power cycling the hubs fixes the problem. Telnet and web access is disabled on all of the hubs. Only SNMP and console access is enabled. Have there been attacks that other network engineers have noticed in the last 5 days or so that are similar to what we are seeing??