iptables
Aleksandar Milivojevic
alex at milivojevic.org
Wed Dec 13 23:04:06 UTC 2006
Quoting tamer amr <tamer_linux at yahoo.com>:
> 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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