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ubuntu telnet server install (우분투 텔넷 서버 설치)
install telnet server (텔넷 서버 설치)
1 | $ sudo apt-get install xinetd telnetd |
Configure telnet server (텔넷 서버 설정)
add below script on /etc/xinetd.d/telnet
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | $ vi /etc/xinetd.d/telnet ----------------------- # default: off service telnet { disable = no flags = REUSE socket_type = stream wait = no user = root server = /usr/sbin/in.telnetd log_on_failure += USERID } |
Start telnet server (텔넷 서버 실행)
1 | $ sudo /etc/init.d/xinetd restart | cs |
Check telnet server (텔넷 서버 테스트)
1 | $ telnet < IP or HostName > | cs |
or
1 2 3 | $ telnet telnet> open (to) < IP or HostName | cs |
if this error occurs, you should check ACL.
1 2 3 | $ telnet 192.88.19.11 23 Trying 192.88.19.11... telnet: connect to address 192.88.19.11: Connection refused | cs |
scan port
1 | $ nmap -A <from IP>/32 -p 23 | cs |
23 port is closed
1 2 3 4 5 6 7 | $ nmap -A 192.88.19.23/32 -p 23 Starting Nmap 7.01 ( https://nmap.org ) at 2018-12-10 13:08 KST Nmap scan report for aaa.com (192.88.19.23) Host is up (0.0014s latency). PORT STATE SERVICE VERSION 23/tcp closed telnet | cs |
open 23 ports . be careful of openning ACL
1 | $ sudo iptables -A IN_public_allow -p tcp -m tcp --dport 23 -m conntrack --ctstate NEW -j ACCEP | cs |
connect telnet
1 2 3 4 5 | $ telnet 192.88.19.11 23 Trying 192.88.19.11... Connected to aaa.com. Escape character is '^]'. Password: | cs |
done.
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