strange broadcast logging in messages file
 

i keep seem to be getting the following in my /var/log/messages file:

Oct 12 21:56:07 pcp04521517pcs kernel: DROPPED IN=eth1 OUT= MAC=ff:ff:ff:ff:ff:ff:00:01:5c:22:3a:02:08:00 SRC=68.40.68.129 DST=255.255.255.255 LEN=331 TOS=0x00 PREC=0x00 TTL=64 ID=10764 PROTO=UDP SPT=67 DPT=68 LEN=311
Oct 12 21:56:08 pcp04521517pcs kernel: DROPPED IN=eth1 OUT= MAC=ff:ff:ff:ff:ff:ff:00:01:5c:22:3a:02:08:00 SRC=68.40.68.129 DST=255.255.255.255 LEN=331 TOS=0x00 PREC=0x00 TTL=64 ID=10797 PROTO=UDP SPT=67 DPT=68 LEN=311
Oct 12 21:56:08 pcp04521517pcs kernel: DROPPED IN=eth1 OUT= MAC=ff:ff:ff:ff:ff:ff:00:01:5c:22:3a:02:08:00 SRC=10.107.208.1 DST=255.255.255.255 LEN=328 TOS=0x00 PREC=0x00 TTL=64 ID=10810 PROTO=UDP SPT=67 DPT=68 LEN=308
Oct 12 21:56:09 pcp04521517pcs kernel: DROPPED IN=eth1 OUT= MAC=ff:ff:ff:ff:ff:ff:00:01:5c:22:3a:02:08:00 SRC=68.40.68.129 DST=255.255.255.255 LEN=331 TOS=0x00 PREC=0x00 TTL=64 ID=10841 PROTO=UDP SPT=67 DPT=68 LEN=311
Oct 12 21:56:10 pcp04521517pcs kernel: DROPPED IN=eth1 OUT= MAC=ff:ff:ff:ff:ff:ff:00:01:5c:22:3a:02:08:00 SRC=68.40.68.129 DST=255.255.255.255 LEN=331 TOS=0x00 PREC=0x00 TTL=64 ID=10861 PROTO=UDP SPT=67 DPT=68 LEN=311
Oct 12 21:56:11 pcp04521517pcs kernel: DROPPED IN=eth1 OUT= MAC=ff:ff:ff:ff:ff:ff:00:01:5c:22:3a:02:08:00 SRC=68.40.68.129 DST=255.255.255.255 LEN=352 TOS=0x00 PREC=0x00 TTL=64 ID=10883 PROTO=UDP SPT=67 DPT=68 LEN=332

etc...

neither the 68.40.681.29 nor 10.107.208.1 addresses are mine.
what's going on here?

also, how do i make iptables not log these entries?

thanks