windows：远程桌面
SSH服务介绍
telnet 服务的问题
iptables
selinux
getenforce
PERMISSIVE
touch /.autorelabel
yum intall telnet 客户端
yum install telnet-server xinetd -y
systemctl start xinetd.service
systemctl start telnet.socket
ifconfig eth0
telnet 10.211.44.3
iptables -I INPUT -p tcp --dport 23 -j ACCEPT
firewall-cmd --add-port=23/tcp --permanent
firewall-cmd --reload
tcpdump -i any port 23 -s 1500 -w /root/a.dump
wireshark
yum install wireshark-gnome