iptables log understanding help

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http://www.linuxquestions.org – I have a couple of logs I don't quite understand Code: [21617.117590] netfilter:in dropped: IN=eth1 OUT= MAC=c4:17:fe:65:51:f8:00:26:44:59:a6:10:08:00 SRC= DST= LEN=352 TOS=0x00 PREC=0x00 TTL=64 ID=7198 PROTO=UDP SPT=1900 DPT=47286 LEN=332 So this is incoming from the router to my network address...what is the purpose of the packet? is it an issue that I'm dropping it? Code: [21896.728247] netfilter:in dropped: IN=eth1 OUT= MAC= SRC= DST= LEN=72 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=57621 DPT=57621 LEN=52 From google, I believ (HowTos)