通过tcpdump抓包获取到的信息

admin

14:52:19.772673 IP 192.168.11.223.55081 > npsc-220.ndmp: Flags [S], seq 1925249825, win 14600, options [mss 1460,sackOK,TS val 11741993 ecr 0,nop,wscale 6], length 0
; f6 V$ y* e: o( {, M+ g% p5 Q$ A& @) [14:52:19.772695 IP npsc-220.ndmp > 192.168.11.223.55081: Flags [S.], seq 821610649, ack 1925249826, win 14480, options [mss 1460,sackOK,TS val 20292985 ecr 11741993,nop,wscale 7], length 0
14:52:19.773256 IP 192.168.11.223.55081 > npsc-220.ndmp: Flags [.], ack 821610650, win 229, options [nop,nop,TS val 11741994 ecr 20292985], length 0

admin

三次握手失败，只有接收包，没有返回包。

admin

tcpdump -i enp0s3  -X 'port 323'  -c 1
tcpdump抓包，udp包

admin

tcpdump -i enp0s3  -vv -X 'port 323'  -c 1