What do these lines mean in var/log/messages?

Looking at var/log/messages, I see tons of lines like:

Code: 
Jun 20 14:53:44 server kernel: ** IN_TCP DROP ** IN=eth0 OUT= MAC=00:0f:ea:5b:0f
:1d:00:01:63:44:15:00:08:00 SRC=62.57.237.207 DST=64.71.154.130 LEN=48 TOS=0x04
PREC=0x00 TTL=116 ID=53811 DF PROTO=TCP SPT=3003 DPT=1755 WINDOW=32767 RES=0x00
SYN URGP=0 OPT (020405B401010402)
Jun 20 14:53:49 server kernel: ** IN_TCP DROP ** IN=eth0 OUT= MAC=00:0f:ea:5b:0f
:1d:00:01:63:44:15:00:08:00 SRC=62.57.237.207 DST=64.71.154.130 LEN=48 TOS=0x04
PREC=0x00 TTL=116 ID=54310 DF PROTO=TCP SPT=3003 DPT=1755 WINDOW=32767 RES=0x00
SYN URGP=0 OPT (020405B401010402)
Jun 20 14:54:08 server kernel: ** IN_TCP DROP ** IN=eth0 OUT= MAC=00:0f:ea:5b:0f
:1d:00:01:63:44:15:00:08:00 SRC=62.57.237.207 DST=64.71.154.130 LEN=48 TOS=0x04
PREC=0x00 TTL=116 ID=56002 DF PROTO=TCP SPT=3020 DPT=1755 WINDOW=32767 RES=0x00
SYN URGP=0 OPT (020405B401010402)
Jun 20 14:54:11 server kernel: ** IN_TCP DROP ** IN=eth0 OUT= MAC=00:0f:ea:5b:0f
:1d:00:01:63:44:15:00:08:00 SRC=62.57.237.207 DST=64.71.154.130 LEN=48 TOS=0x04
PREC=0x00 TTL=116 ID=56242 DF PROTO=TCP SPT=3020 DPT=1755 WINDOW=32767 RES=0x00
SYN URGP=0 OPT (020405B401010402)
Jun 20 14:54:18 server kernel: ** IN_TCP DROP ** IN=eth0 OUT= MAC=00:0f:ea:5b:0f
:1d:00:01:63:44:15:00:08:00 SRC=62.57.237.207 DST=64.71.154.130 LEN=48 TOS=0x04
PREC=0x00 TTL=116 ID=56629 DF PROTO=TCP SPT=3020 DPT=1755 WINDOW=32767 RES=0x00
SYN URGP=0 OPT (020405B401010402)
Jun 20 14:55:07 server kernel: ** IN_TCP DROP ** IN=eth0 OUT= MAC=00:0f:ea:5b:0f
:1d:00:01:63:44:15:00:08:00 SRC=62.57.237.207 DST=64.71.154.130 LEN=48 TOS=0x04
PREC=0x00 TTL=116 ID=60284 DF PROTO=TCP SPT=3056 DPT=1755 WINDOW=32767 RES=0x00
SYN URGP=0 OPT (020405B401010402)
Jun 20 14:55:10 server kernel: ** IN_TCP DROP ** IN=eth0 OUT= MAC=00:0f:ea:5b:0f
:1d:00:01:63:44:15:00:08:00 SRC=62.57.237.207 DST=64.71.154.130 LEN=48 TOS=0x04
PREC=0x00 TTL=116 ID=60492 DF PROTO=TCP SPT=3056 DPT=1755 WINDOW=32767 RES=0x00
SYN URGP=0 OPT (020405B401010402)
Just wondering, what do they mean? Should I be worried?

Thanks,

 

 

 

 

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