14-byte MAC ?

Running SuSEfirewall2 on a SuSE 8.0 box connected via eth1 to a cable network (no local network running), I occasionally get messages like: Jul 28 10:25:41 betsy kernel: SuSE-FW-UNAUTHORIZED-TARGET IN=eth1 OUT= MAC=01:00:5e:00:00:01:00:20:40:67:0f:eb:08:00 SRC=192.168.100.1 DST=224.0.0.1 LEN=28 TOS=0x00 PREC=0xC0 TTL=1 ID=0 PROTO=2 Ethereal tells me these are IGMP messages from 192.168.100.1 to 224.0.0.1, neither of which is anything like my ip address, which is fair enough and doesn't worry me, but, why is the message showing a 14-byte MAC address rather than the normal 6-byte variety? -- Pam R: Any opinions expressed in this email are not necessarily those of a sane person.