unknow message

hi all, does any one know this ?

snip

Feb 23 13:41:56 upnlr3 kernel: martian destination 00000000 from 1f011f0a, dev eth1 Feb 23 13:43:20 upnlr3 kernel: martian destination 00000000 from 1f011f0a, dev eth1

arp ? IPv6? thankx Markus