kali linux 2016.2中沒有內置firewalk需要進行安裝
root@kali:~# apt-get install firewalk
firewalk主要有兩個功能
採用遞增模式判斷當前主機到目標主機間的TTL
掃描目標端口開放情況
root@kali:~# firewalk
Firewalk 5.0 [gateway ACL scanner]
Usage : firewalk [options] target_gateway metric
[-d 0 - 65535] destination port to use (ramping phase) //設置要掃描的端口
[-h] program help //幫助
[-i device] interface //指定網絡接口
[-n] do not resolve IP addresses into hostnames //不將IP地址解析到主機名中
[-p TCP | UDP] firewalk protocol //firewalk協議
[-r] strict RFC adherence //嚴格RFC
[-S x - y, z] port range to scan //掃描指定端口範圍
[-s 0 - 65535] source port //源端口
[-T 1 - 1000] packet read timeout in ms //數據包讀取超時設置
[-t 1 - 25] IP time to live //設置TTL
[-v] program version //版本
[-x 1 - 8] expire vector //到期向量(不知道有啥用)