How to open telnet port in wireless D-Link router?

Question

I want to access D-Link DIR-600L wireless router via terminal. Can i do this by opening telnet port. How to open telnet port in wireless routers?

Answer 1

Based in other answer this worked for me:

Login to the web interface.

You can access shell terminal using: 192.168.0.1/shell.asp where 192.168.0.1 is your IP address of Wi-Fi router.

In the shell terminal you type: telnetd and press Apply. DO NOT USE telnetd.sh.

Using telnet client in your PC and type telnet 192.168.0.1 and you can see login prompt.

I was able to update iptables.

This is the telnetd.sh file if anybody wants to know

# cat /bin/telnetd.sh 
#!/bin/sh
image_sign=`cat /etc/alpha_config/image_sign`
echo "Start telnetd ..." > /dev/console
mfc_mode=`flash get_hwflag mfc`
if [ $mfc_mode = 1 ]; then
        timeout=" -t 600"
fi
if [ -f "/usr/bin/login" ]; then
        telnetd -l "/usr/bin/login" -u Alphanetworks:$image_sign -i br0 $timeout &
else
        telnetd &
fi

Answer 2

1. Login to the web interface.
2. You can access shell terminal using: 192.168.0.1/shell.asp where 192.168.0.1 is your IP address of Wi-Fi router.
3. In the shell terminal you type: telnetd.sh and press Apply.
4. Using telnet client in your PC and type telnet 192.168.0.1 and you can see login prompt.

But I can’t find any information to login by root. Router say login incorrect when I type root in login prompt.

Answer 3

First of all, don't use telnet - just don't if you can avoid it. Buy a copy of Michael W. Lucas "SSH Mastery 2nd Edition" (which is actually quite approachable) and read it. Telnet is not encrypted (and also has way less functionality than OpenSSH)!

If you want to use telnet anyway:

1. Login to the web interface with Your credentials.
2. If you use Windows, open cmd.exe from start. (Windows+R type cmd and press Enter)
3. Write telnet <YOUR ROUTERS IP HERE> e.g. like telnet 192.168.0.100
4. Login as admin and write Your password.

Your D-Link DIR-600L Router has most likely many security vulnerabilities. Please do the internet community a favor and upgrade to a supported operating system like OpenWRT (which would give you complete SSH also) or by buying a supported router from a reputable manufacturer and keeping it up to date.

I have myself used OpenWRT on a similar device by D-Link. Installing it will probably also be easier than you expect and you will have SSH access and full control also. In OpenWRT, there are serious advances in how your internet connection gets used more efficiently and also regular security fixes (which you should apply). You might also learn something helpful on the way, like not using telnet in 2018.

Btw. you will do yourself a favor, if you upgrade to something newer with Gigabit Ethernet Ports, and more RAM (like at least 128 MB). You can have a look, whether OpenWRT folks recommend it beforehand, since those are actually the serious users. The Linksys WRT AC1200 seems to be well supported.