what does these few lines indicating? explain.

Found when i do a "dmesg"

Code: 
ip_conntrack: table full, dropping packet.
NET: 2738 messages suppressed.
ip_conntrack: table full, dropping packet.
NET: 2622 messages suppressed.
ip_conntrack: table full, dropping packet.
NET: 2716 messages suppressed.
ip_conntrack: table full, dropping packet.
NET: 2985 messages suppressed.
ip_conntrack: table full, dropping packet.
NET: 2953 messages suppressed.
ip_conntrack: table full, dropping packet.
NET: 2706 messages suppressed.
ip_conntrack: table full, dropping packet.
possible SYN flooding on port 80. Sending cookies.
NET: 3089 messages suppressed.
ip_conntrack: table full, dropping packet.
NET: 3400 messages suppressed.
ip_conntrack: table full, dropping packet.
NET: 2636 messages suppressed.
ip_conntrack: table full, dropping packet.
also,

before the server reboot, i found a series of log that say.

Code: 
Jun 13 12:13:25 titan kernel: possible SYN flooding on port 80. Sending cookies.
Jun 13 12:14:25 titan kernel: possible SYN flooding on port 80. Sending cookies.
Jun 13 12:14:26 myserver kernel: ** TCP DROP ** IN=eth0 OUT= MAC=00:10:dc:ca:36:2a:00:e0:52:11:5e:57:08:00 SRC=210.118.155.140
DST=66.x.x.x LEN=48 TOS=0x00 PREC=0x00 TTL=111 ID=34023 DF PROTO=TCP SPT=3748 DPT=1025 WINDOW=16384 RES=0x00 SYN URGP=0

 

 

 

 

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