How to configure secure shell ssh on a cisco router. Go to router0 console and configure hostname, secret password and telnet with line vty command. A tutorial for ultraedituestudios sshtelnet feature. When you connect to the router through a vty line, the number of the vty line is not assigned sequentially. How to enable and use windows 10s new builtin ssh commands. How to create, configure access control lists for vty line. The configuration of access control is important to the virtual terminal lines vty because to make telnet or ssh connection to the router it requires or uses only one of the network administration. Configuring access control to the vty lines is important, because normally you require only the network administrators to make a telnet or ssh connection to the router. When you connect to the router through a vty line, the number of the vty line is not. But it also allows some other protocols they are not common in todays networking environment but the original question was quite specific that they want to allow only 2 protocols and not all protocols. Well use the secure shell application, ssh, for remote access and log in the. If you have a telnet server running on port 9696 of a.
The local database on the router will do just fine for this example. Create a loopback interface and configure it with the ip address 10. You can configure telnet on all cisco switches and. Clicking on this button will present the standard windows font dialog from which you may. As you can see from the example, the router has one console line labeled cty, one aux port labeled aux, five vty lines, and 32 tty lines. And configure the vty lines to accept only ssh and local authentication. Configure ssh on tty lines with menu option on terminal server. Configuring secure shell on routers and switches running cisco ios. It is best practice to not only control access to a cisco switch or router vty lines but encrypt the management traffic. Configure the cisco device with a hostname and domain name hostname 35601. Securing vty lines on cisco routerswitches integrating it.
Configuration examples for ssh terminalline access, page 5. This post will show you how to enable ssh in cisco ios router. Now that weve generated the key, our next step would be to configure our vty lines for ssh access and specify which database we are going to use to provide authentication to the device. Configuring vty lines technical documentation support juniper. Since you open reverse connections to the lines, it comes from vty line and hence ssh should be allowed. Only ssh version 1 is implemented in the cisco ios software. Now that weve generated the key, our next step would be to configure our vty lines for ssh access and specify which database we are going to use. The vty lines authentication should be configured to authenticate to the local database. Configuring secure shell virtual terminal access ssh.
This article is going to shows the ccna students to configure and enable telnet and ssh on cisco router and switches. This can be done by connecting from a different host on the network, but you can also test from the router itself by telnetting to the ip address of any interface on the router that. Configure the transport input protocol on the vty lines to accept only ssh by executing the transport input ssh under the vty line configuration mode as shown below. To configure standrad access control lists acl to your vty lines telnet or ssh follow these steps. Configure your vty lines for ssh as outgoing protocol. Ssh terminalline access also known as reversetelnet was introduced in some cisco ios platforms and images starting in cisco ios software. Ssh is enabled but we also have to configure the vty lines. Configure lines and vtys on cisco routers techrepublic. The system supports 30 virtual tty vty lines for telnet, ssh, and ftp services. Enable telnet and ssh on cisco router and switches bt blog. Configuring vty lines technical documentation support. Microsoft refers to a vpn connection used for remote access as an internetbased vpn. Secure shell configuration guide, cisco ios release 15s ssh.
This document describes how to configure a cisco router as a terminal server with the use of. Reducing exposure to dos attacks against the vty lines by configuring a. Older routersswitches with the old ios will only allow up to line vty 0 4 5 concurrent connections and that s why most books will tell you to use line vty 0 4 while newer modelsios allow for line vty 0 15 16 concurrent connections. Create an arbitrary username and password in the local user database as required by ssh in order for the vty lines to establish a remote exec session. The load option causes putty to load configuration details out of a saved session. In the router, if a telnet or ssh connection is made, then the router will connect to the virtual terminal line vty. Configuring the vty lines access control list free ccna.
Here, we will enable telnet on router1 and take access through router2. Each telnet, ssh, or ftp session requires one vty line. Microsoft refers to a vpn connection used for remote access as an internet based vpn. Your software release may not support all the features documented in this module. With the use of ssh client software, you can connect through ssh with.
How to create and configure access control lists for vty. If you want to create a windows shortcut to start a putty saved. The telnet is an old and non secure application protocol of remote control services. Setting vty lines for ssh % telnet only the suggestion from leo would certainly allow both telnet and ssh. To enable telnet or ssh on cisco router, simply do it with line vty command. The ssh client is a part of windows 10, but its an optional feature that isnt installed by default. The ssh terminalline access feature enables users to configure their router with. This blog post describes how to enable ssh and configure a basic acl to permit traffic from trusted source ip subnet. To reuse those vty lines you should give transport input ssh so that you can still have ssh access to the device on vty lines 3 to 15. Optionally, you can configure the router to disable ssh password authentication. Telnet, console and aux port passwords on cisco routers. Configure telnet and ssh on cisco packet tracer newjar. When you restrict vty lines only to ssh, you cannot use the command to.