To add an illustration to what
gilead said, here's a random iptables entry from my log file:
Code:
May 27 15:39:17 candystore kernel: [ 4317.423655] INPUT DROP: IN=eth0 OUT= MAC=00:08:43:cc:6c:03:00:30:c5:c8:b8:50:08:00 SRC=123.123.123.123 DST=234.234.234.234 LEN=91 TOS=0x00 PREC=0x00 TTL=117 ID=28191 PROTO=UDP SPT=32158 DPT=14412 LEN=71