I haven't seen specific details posted here, so: Like many others, we've had a few TNTs online for years without hiccups or reboots until this week. Beginning late Sunday, we saw seemingly random blade reboots, and total system crashes. Errors ranged from memory leaks to infinite loops on the controller blade, but all blades were susceptible. HDLC2 blades seemed to be particularly vulnerable. We saw boxes that had been rock-solid for very long periods suddenly rebooting at periods ranging from 20 minutes to 4 hours, with no obvious cause (i.e., nothing more specific than the above). Border and core filtering of icmp echo * did little good. On the suggestion of some folks on another list, and against my better judgment, we disabled route caching in order to free up additional memory (though memory did not appear fragmented). This stabilized all involved boxes, and surprisingly, did not result in significant degradation of end user performance. Granted, it's not a true fix, but it may get you a few extra Z's at night. hth, brian