<div>
<a href="https://www.experts-exchange.com/questions/20738663/1720-Telnet-open-outside.html" rel="ugc">https://www.experts-exchange.com/questions/20738663/1720-Telnet-open-outside.html</a>
</div>


https://www.experts-exchange.com/questions/20738663/1720-Telnet-open-outside.html [https://www.experts-exchange.com/questions/20738663/1720-Telnet-open-outside.html]

<div>
Your access-list worked a treat, lrmoore.<br />
<br />
Thanks, as always.<br />
<br />
Steve<br />

</div>


Your access-list worked a treat, lrmoore.

Thanks, as always.

Steve


<div>
<div class="content wysiwyg-content">
Good day,<br />
<br />
I've recently set up a Cisco 1720 and got it working with varying degrees of help from various people.<br />
<br />
Now it's up &amp;&nbsp;running I have one more concern - I can telnet to it from the outside world - That is to say, if I ssh into a remote shell, and telnet back to the routers public IP, I get a telnet response asking for a password.<br />
<br />
Having done a security scan, I'm sure it's just telnet that's open.<br />
<br />
What can I add to the conf file to stop this ? &nbsp;If possible (with ease) I'd like to be able to specify 5 fixed IP addresses that should be allowed to access it, but if this is terribly hard, then it would suffice just to block it from the outside world.<br />
<br />
Thanks alot for reading.<br />
<br />
Steve<br />

</div>
</div>


Good day,

I've recently set up a Cisco 1720 and got it working with varying degrees of help from various people.

Now it's up & running I have one more concern - I can telnet to it from the outside world - That is to say, if I ssh into a remote shell, and telnet back to the routers public IP, I get a telnet response asking for a password.

Having done a security scan, I'm sure it's just telnet that's open.

What can I add to the conf file to stop this ?  If possible (with ease) I'd like to be able to specify 5 fixed IP addresses that should be allowed to access it, but if this is terribly hard, then it would suffice just to block it from the outside world.

Thanks alot for reading.

Steve


Cisco 1720 accessible to all

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.