{{{ ping -b 10.20.57.0 //ping广播包 traceroute www.sina.com.cn //看哪里不通 mtr www.sina.com //可以看到经过哪些路由，哪个路由的掉包率
ping www.sina.com.cn dig www.sina.com.cn host www.sina.com.cn nslookup www.sina.com.cn
nslookup
www.sina.com.cn set q=ns //q=a记录 set q=ns com ／／查询根 Server: 8.8.4.4 Address: 8.8.4.4#53
Non-authoritative answer: com nameserver = j.gtld-servers.net. com nameserver = l.gtld-servers.net. com nameserver = c.gtld-servers.net. com nameserver = b.gtld-servers.net. com nameserver = d.gtld-servers.net. com nameserver = g.gtld-servers.net. com nameserver = f.gtld-servers.net. com nameserver = e.gtld-servers.net. com nameserver = h.gtld-servers.net. com nameserver = a.gtld-servers.net. com nameserver = i.gtld-servers.net. com nameserver = k.gtld-servers.net. com nameserver = m.gtld-servers.net.
Authoritative answers can be found from:
ftp lftp命令比ftp好用
telnet ip port 测试端口是否打开
tcpdump port 22 抓包，检测网络
elinks links 访问对方网站 wget 下载，可以下载整站，可以下载限制层数
}}}
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