Hi, I have reported kernel panic on Dell 1600SC with 5.4-RELEASE but it is related to ipnat from IPFILTER V3.4.35. Without SMP everything seems to work fine. But when I turn on SMP and do ping -f one of ip addresses that is maped to outside interface produces kernel panic or lock hard (no response to ping or keyboard). Regards, gg. p.s. I had few enteries like: map fxp0 192.168.1.11/32 -> x.y.z.q/32 now I have moved them on another UP machine.