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Get initial congestion window (initcwnd) and initial receive window (initrwnd) of remote server.

Usage: initcwnd_check.pl <dev> <uri> (<dst_ip>)

Example:

# ./initcwnd_check.pl eth0 http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js
+ connected from x.x.x.x:1777 to 74.125.71.95:80
* ajax.googleapis.com (74.125.71.95) - init_cwnd: 10 (14300 byte), init_rwnd: 4 (5720 byte)

# ./initcwnd_check.pl eth0 http://kr.yahoo.com/ 111.67.226.84
+ connected from x.x.x.x:2652 to 111.67.226.84:80
* kr.yahoo.com (111.67.226.84) - init_cwnd: 2 (2875 byte), init_rwnd: 4 (5840 byte)

Requirements:

* root
* /sbin/iptables, /sbin/ip
* perl module
	- Net::RawIP
	- Net::Pcap
	- NetPacket::Ethernet
	- NetPacket::IP
	- NetPacket::TCP
	- Socket
	- POSIX