Allow only SSH to device - Cisco

    Allow only SSH to device - Cisco

    Technology: Security
    Area: Device Hardening
    Vendor: Cisco
    Title: How to allow SSH only to Cisco device
    Software: 12.X , 15.X
    Platform: Catalyst switches, Routers

    Secure Shell (SSH) is a protocol used when one wants to have vides a secure remote access connection to network devices. Communication between the client and server is encrypted in both SSH version 1 and SSH version 2. Implement SSH version 2 when possible because it uses a more enhanced security encryption algorithm. To restrict the device to accept only ssh connections (no telnet), use configuration below.


    Switch# configure terminal
    Switch(config)#line vty 0 15
    Switch(config-line)#transport input ssh


    Verifying if the ssh connection is working:

    PC> ssh -1 admin


    Verifying if telnet connection is possible

    PC> telnet

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