检查网络问题 是否链接
ip a
tcpdump -i ens6f0 ip host 10.44.55.66 tcpdump -i ens6f0 port 513 and host 10.44.55.66 netstat -anp | grep 513
ip a
tcpdump -i ens6f0 ip host 10.44.55.66 tcpdump -i ens6f0 port 513 and host 10.44.55.66 netstat -anp | grep 513