FreeBSD 4.10, непрерывно появляются подобные строчки в логах:

Feb  3 14:35:52 hostname /kernel: arp: 192.168.0.38 moved from 00:0c:80:79:3e:cc
to 00:50:bf:64:56:6b on fxp1
Feb  3 14:35:59 hostname /kernel: arp: 192.168.0.17 moved from 00:ea:46:39:3c:cf
to 00:80:ad:09:03:5d on fxp1
Feb  3 14:36:18 hostname /kernel: arp: 192.168.0.71 moved from 00:64:1c:27:5c:ee
to 00:80:48:ca:b1:50 on fxp1
Feb  3 14:36:38 hostname /kernel: arplookup 0.0.0.0 failed: host is not on local
network
Feb  3 14:36:44 hostname /kernel: arp: 192.168.0.64 moved from 00:3c:9f:21:08:bd
to 00:50:22:b8:06:f4 on fxp1
Feb  3 14:37:01 hostname /kernel: arplookup 0.0.0.0 failed: host is not on local
network
Feb  3 14:37:04 hostname /kernel: arp: 192.168.0.72 moved from 00:b2:16:4f:65:16
to 00:50:22:e1:b1:ca on fxp1
Feb  3 14:37:12 hostname /kernel: arp: 192.168.0.148 moved from 00:a0:b4:df:96:7
a to 00:10:60:5f:57:7a on fxp1

это может быть неисправностью оборудования или надо искать злоумышленника?