Quoting tamer amr <tamer_linux@xxxxxxxxx>:
i want to know what is the --syn option doing in the iptables rule ?
As manual page says, it will match packets with the SYN bit set, and the ACK and RST bits cleared.
because i want to know what is the SYN,ACK packets ?
SYN,ACK is usually second packet exchanged when establishing TCP connection (the response to initial SYN packet). For details on how TCP works, I'd suggest some good book, such as TCP/IP Illustrated by W. Richard Stevens (available from Amazon, among other places). You'd probably want to read volume 1. Volumes 2 and 3 are also interesting read.
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