[우분투서버] ssh 및 telnet 설치

ㅇ ssh 설치

> apt-get install openssh-server
> service ssh restart
> vi /etc/hosts.allow
   sshd : x.x.x.x  (허용하고 싶은 IP)
> ps -aux |grep ssh
> netstat -napt | grep ssh

ㅇ telnet 설치

> apt-get install xinetd
> apt-get install telnetd
> vi /etc/xinetd.conf
service telnet
{
disable = no
flags = REUSE
socket_type = stream
wait = no
user = root
server = /usr/sbin/in.telnetd
log_on_failure = USERID
}
>vi /etc/hosts.allow
in.telnetd 0.0.0.0  (or all 0.0.0.0)                <- 0.0.0.0 대신에 원하는 ip
> service xinetd restart
> netstat -napt |grep 23