1. Cisco Ios Crypto Key Generate Rsa
2. Cisco Crypto Key Gen Rsa
3. Crypto Key Generate Rsa 2048
4. Cisco Ios Xr Crypto Key Generate Rsa

• October 2, 2015
• Posted by: Syed Shujaat
• Category: Cisco, Networking Solutions

Use this command to generate RSA key pairs for your Cisco device (such as a router). keys are generated in pairs–one public RSA key and one private RSA key.

A router configured with SSH server allows a secure connection to the router similar to Telnet. The Telnet application has limited security. SSH provides stronger encryption and deploys public-key cryptography for added confidentiality. IOS XR supports two versions of SSH: SSH version 1 uses Rivest, Shamire, and Adelman (RSA) keys. IOS-XR Ansible project. Contribute to ios-xr/iosxr-ansible development by creating an account on GitHub. IOS-XR Ansible project. Contribute to ios-xr/iosxr-ansible development by creating an account on GitHub. Better(config)#crypto key generate rsa The name for the keys will be: better.malesky.org Choose the size of the key modulus in the range of 360 to 2048 for your General Purpose Keys. Choosing a key modulus greater than 512 may take a few minutes. This document contains information that will help users secure Cisco IOS XR system devices to increase the overall security of a network. Structured around the three planes by which the functions of a network device are categorized, this document provides an overview of each Cisco IOS XR Software feature and references related documentation.

If your router already has RSA keys when you issue this command, you will be warned and prompted to replace the existing keys with new keys.

NOTE: Before issuing this command, ensure that your router has a hostname and IP domain name configured (with the hostname and ipdomain-name commands).

Nov 13, 2011  Cisco IOS router SSH version 2 In this configuration example we will enable ssh version 2 on the router: Here is the configuration: hostname testrouter ip domain-name test-router-for-ssh.com username testrouter secret testrouter enable secret cisco crypto key generate rsa modulus 1024 ip ssh version 2 line vty 0 4 transport input ssh login local. How I create RSA key and enable SSH access in Cisco VG202, in a Cisco router I use the next commands(but in a VG not exists): conf t crypto key generate rsa modulus 1024 ip domain-name domain-name ip ssh version 2 ip ssh time-out 120 ip ssh authentication-retries 3 line vty 0 4 transport input telne.

You will be unable to complete the cryptokeygeneratersacommand without a hostname and IP domain name. (This situation is not true when you generate only a named key pair.)

Here are the steps to Enable SSH and Crypto Key setup : 2 config must requried for SSH

1 Setup Local VTY line User ID and password

router (Config) # Line VTY 0 15

router (Config-line)# login local

router (Config-line)# Exit

!!! create local login ID/Pass

router (Config)# username [loginid] password [cisco]

router (Config)# username loginid1 password cisco1

2. router (Config)# ip domain-name example.com

router (Config)# crypto key generate rsa

how many bits in the modulus [512] :1024Windows vista home basic product key generator free download.

router (Config)# ip ssh version2

router (Config)# CTRL Z

This command is not saved in the router configuration; however, the RSA keys generated by this command are saved in the private configuration in NVRAM (which is never displayed to the user or backed up to another device) the next time the configuration is written to NVRAM.

Modulus Length

When you generate RSA keys, you will be prompted to enter a modulus length. The longer the modulus, the stronger the security. However, a longer modules take longer to generate (see the table below for sample times) and takes longer to use.

The size of Key Modulus range from 360 to 2048. Choosing modulus greater than 512 will take longer time.

Cisco IOS software does not support a modulus greater than 4096 bits. A length of less than 512 bits is normally not recommended. In certain situations, the shorter modulus may not function properly with IKE, so we recommend using a minimum modulus of 2048 bits.

Syntax Description : Optional Strings to embed with SSH Crypto key

This article will examine IPSec VPN implementation techniques over an IOS XR platform. Implementing IPSec VPN over an IOS XR involves some new set of rules and commands compared to a traditional Cisco IOS.

This article assumes that you have basic access level knowledge of Cisco IOS XR platform (if not then you can use my previous posts on IOS XR as reference). We will use the following network topology (Fig. 1) for implementing IPSec site-to-site VPN.

Cisco IOS XR supports two types of IPSec deployments:

Software-based IPSec, which uses tunnel-ipsec or a transport entity for local source traffic.

Hardware-based IPSec, which uses service-ipsec and service-gre interfaces for transit traffic.

Before starting the technical discussion on IPSec VPN implementations, let’s review some essential IPSec and ISAKMP protocols and algorithms.

Internet Key Exchange (IKE) is mainly used with IPSec protocol to negotiate security associations and authentication of IPSec peers.

IP Security Protocol (IPSec) is an open standard mechanism that offers layer 3 security services by using the negotiation of IKE protocols and algorithms to regulate data confidentiality and integrity of participating peers to protect one or more data flows between them.

Internet Security Association and Key Management Protocol (ISAKMP) manages the methodology of implementing a key exchange protocol along with security association negotiation.

ISAKMP/IPSec Components

Data Encryption Standard (DES) is a packet data encryption algorithm. Cisco IOS XR supports DES as well as Triple DES (168-bit) encryption techniques (as shown in Fig. 2 below). Triple DES (3DES) is a robust encryption mechanism to normalise sensitive information over insecure networks.

Advanced Encryption Standard (AES) is a standard for packet data encryption. Cisco IOS XR supports 128-bit, 192-bit, and 256-bit AES encryption (as shown in Fig. 2 below).

Diffie-Hellman is used to share session keys using cryptography and allows two sites to establish a shared secret key communication within IKE. Cisco IOS XR supports 768-bit, 1024-bit, and 1536-bit Diffie-Hellman groups.

Message Digest (MD5) is a hash algorithm used to verify authentication of packet data. MD5 HMAC offers an additional level of hashing to IPSec data integrity.

Secure Hash Algorithm (SHA) is also a hash algorithm for packet data authentication. SHA HMAC provides an additional level of hashing to IPSec data integrity.

RSA signatures and RSA encrypted or Rivest Shamir Adelman (RSA) is used for public key cryptography using signatures.

As you can see in Fig. 3, ESP supports both hash and encryption algorithms while AH supports hash algorithms only.

Steps to Implement IPSec VPN on IOS XR

Step 1.Enable ISAKMP and configure ISAKMP policy

Multiple IKE policies can be designed on an IOS XR device and each policy can have different combinations of parameter values; however, encryption, hash, authentication, and Diffie-Hellman values must be the same on the remote peer.

ISAKMP activation and policy design on router XR1,:

Cisco Ios Crypto Key Generate Rsa

On XR2,:

To verify ISAKMP activation on an IOS XR device, use “show crypto isakmp” and you will get the following output as shown in Fig. 4:

Configure key-ring to authenticate remote site IKE negotiation with a pre-shared key.

Key configuration on XR1:

Key configuration on XR2:

To verify ISAKMP pre shared key configuration on an IOS XR device, use “show crypto isakmp key”.

Step 2.Create IPSec Transform-set and profile

IPSec transform-set is used to implement encryption and hash algorithms for data protection and IOS XR crypto profiles are replaced with a legacy crypto map.

IPSec transform-set on XR1:

IPSec transform-set on XR2:

Design an access control List (ACL) to define which traffic should be encrypted for IPSec VPN.

ACL configuration on XR1:

ACL configuration on XR2:

Cisco Crypto Key Gen Rsa

Design a crypto profile to call ACL and Transform-set. Transform-set defines how traffic matched in ACL will be encrypted. As we have created a transform set with “esp-aes esp-sha-hmac” encryption and hashing algorithms, all matched traffic will be encrypted according to these algorithms. If the defined destination address in ACL is configured as a static route pointing to the SVI, the “reverse-route” must be configured within the crypto profile. This command is optional in site-to-site configurations.

IPSec profile on XR1:

IPSec profile on XR2:

Step 3.Configure IPSec virtual interface (SVI)

IPSec virtual interface can be configured as either “service-ipsec” or “service-gre”. If mode (in IPSec transformation set) is configured as tunnel then “interface service-ipsec” will be used and if “transport” mode is configured then “interface service-gre” will be configured.

Interface service-ipsec configuration on router XR1:

Interface service-ipsec configuration on router XR2,

Step 4.Configure crypto ISAKMP profile

This provides modularity of phase-1 ISAKMP negotiations and maps different ISAKMP parameters to different IPSec tunnels, and different IPSec tunnels to different VPN forwarding and routing (VRF) instances.

ISAKMP profile on XR1:

ISAKMP profile on XR2,

After configuring the above steps, you will be able to get secure communication between remote sites. Once you are able to implement IPSec site to site VPN in the IOS XR platform, it would be quite easy for you to implement DMVPN and other VPNs on an IOS XR environment.

I hope this article will bring you closer to the ocean of IOS XR implementations. I will continue to explore the edges of IOS XR technologies but I also want to read your feedback and your Intenseschool.com experience at the comments section.

Crypto Key Generate Rsa 2048

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References:

Apart from my work experience and knowledge, the following resources helped me a lot to write this exclusive content.

Cisco Ios Xr Crypto Key Generate Rsa

Cisco IOS XR Fundamentals, by Mobeen Tahir, Mark Ghattas, Dawit Birhanu and Syed Natif Nawaz.