抓取TCP协议端口为22网络流量包，且包的上限为1M
/tool sniffer
set file-name="example.pcap"
set file-limit="1000"
set filter-ip-protocol="tcp"
set filter-port="22"
start
/file print where name="example.pcap"
其它参数：
- filter-ip-address
- filter-cpu
- filter-interface
- filter-direction
