Contents
- SSH Support Over IPv6
- Finding Feature Information
- Prerequisites for SSH Support over IPv6
- Information About SSH Support over IPv6
- SSH over an IPv6 Transport
- How to Enable SSH Support over IPv6
- Enabling SSH on an IPv6 Device
- Configuration Examples for SSH Support over IPv6
- Example: Enabling SSH on an IPv6 Device
- Additional References
- Feature Information for SSH Support over IPv6
SSH Support Over IPv6
Secure Shell (SSH) provides support for IPv6 addresses that enable a Cisco device to accept and establish secure, encrypted connections with remote IPv6 nodes over an IPv6 transport.
- Finding Feature Information
- Prerequisites for SSH Support over IPv6
- Information About SSH Support over IPv6
- How to Enable SSH Support over IPv6
- Configuration Examples for SSH Support over IPv6
- Additional References
- Feature Information for SSH Support over IPv6
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Prerequisites for SSH Support over IPv6
- An IPsec (Data Encryption Standard [DES] or 3DES) encryption software image is loaded on your device. IPv6 transport for the SSH server and SSH client requires an IPsec encryption software image.
- A hostname and host domain are configured for your device.
- A Rivest, Shamir, and Adelman (RSA) key pair, which automatically enables SSH, is generated for your device.
- A user authentication mechanism for local or remote access is configured on your device.
- To authenticate SSH clients, configure TACACS+ or RADIUS over an IPv4 transport and then connect to an SSH server over an IPv6 transport.
The basic restrictions for SSH over an IPv4 transport apply to SSH over an IPv6 transport. The use of locally stored usernames and passwords is the only user authentication mechanism supported by SSH over an IPv6 transport. TACACS+ and RADIUS user authentication mechanisms are not supported over an IPv6 transport.
Information About SSH Support over IPv6
SSH over an IPv6 Transport
Secure shell (SSH) SSH in IPv6 functions the same and offers the same benefits as SSH in IPv4. The SSH server feature enables an SSH client to make a secure, encrypted connection to a Cisco device, and the SSH client feature enables a Cisco device to make a secure, encrypted connection to another Cisco device or to any other device running an SSH server. IPv6 enhancements to SSH consist of support for IPv6 addresses that enable a Cisco device to accept and establish secure, encrypted connections with remote IPv6 nodes over an IPv6 transport.
How to Enable SSH Support over IPv6
Enabling SSH on an IPv6 Device
This task is optional. If you do not configure SSH parameters, then the default values will be used.
1.
enable
2.
configure
terminal
3.
ip
ssh
[timeout
seconds |
authentication-retries
integer]
4.
exit
5.
ssh
[
-v
{
1 |
2 } |
c
{
3des |
aes128-cbc |
aes192-cbc |
aes256-cbc } |
-l
userid |
-l
userid:vrfname number ip-address
ip-address |
-l
userid:rotary number
ip-address |
-m
{
hmac-md5 |
hmac-md5-96 |
hmac-sha1 |
hmac-sha1-96 } |
-o
numberofpasswordprompts
n |
-p
port-num]
{
ip-addr |
hostname}
[ command
|
-vrf]
DETAILED STEPS
Configuration Examples for SSH Support over IPv6
Example: Enabling SSH on an IPv6 Device
Device# configure terminal Device(config)# ip ssh Device(config)# exit Device(config)# ssh -l userid1 2001:db8:2222:1044::72
Additional References
Related Documents
Related Topic |
Document Title |
|---|---|
|
IPv6 addressing and connectivity |
IPv6 Configuration Guide |
|
Cisco IOS commands |
|
|
IPv6 commands |
Cisco IOS IPv6 Command Reference |
|
Cisco IOS IPv6 features |
Standards and RFCs
Standard/RFC |
Title |
|---|---|
|
RFCs for IPv6 |
IPv6 RFCs |
MIBs
|
MIB |
MIBs Link |
|---|---|
|
No new or modified MIBs are supported by this feature, and support for existing MIBs has not been modified by this feature. |
To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL: |
Technical Assistance
Description |
Link |
|---|---|
|
The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password. |
Feature Information for SSH Support over IPv6
The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Feature Name |
Releases |
Feature Information |
|---|---|---|
|
SSH Support over IPv6 |
12.2(8)T 12.2(17a)SX1 12.2(25)SEE 12.2(25)SG 12.2(33)SRA 15.0(2)SG Cisco IOS XE Release 2.1 3.2SG |
SSH provides support for IPv6 addresses that enable a Cisco device to accept and establish secure, encrypted connections with remote IPv6 nodes over an IPv6 transport. The following commands were introduced or modified: ip ssh, ssh. |