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Is this a denial of service attack?

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http://serverfault.com – I have my kern.log flooded by these lines: Jan 4 03:00:57 myhost kernel: [9040601.809740] iptables denied: IN=eth0 OUT= MAC=10:00:25:09:e7:40:00:21:5e:3f:c4:04:08:00 SRC=178.33.217.13 DST=xx.xx.xx.xx LEN=64 TOS=0x00 PREC=0x00 TTL=236 ID=33285 PROTO=UDP SPT=25345 DPT=53 LEN=44 Jan 4 03:01:09 myhost kernel: [9040613.699425] iptables denied: IN=eth0 OUT= MAC=10:00:25:09:e7:40:00:21:5e:3f:c4:04:08:00 SRC=178.33.217.13 DST=xx.xx.xx.xx LEN=64 TOS=0x00 PREC=0x00 TTL=236 ID=62996 PROTO=UDP SPT=25345 DPT=53 LEN=44 Jan 4 03:01:21 myhost kernel: [9040625.584770] iptables denied: IN=eth0 OUT= MAC=10 (HowTos)