qr code c# sample 17: IOS Device Management in Objective-C

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17: IOS Device Management
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SSH Con guration
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To set up SSH on your IOS device so you can use an SSH client to access it, you ll need to configure the following:
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A local username and password A hostname and a domain name The SSH version to use
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SSH requires both (username command)
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This is required to label the RSA key pair on the IOS device (hostname and ip domain-name commands) The default is version 1, but the recommended version to use is 2 (ip ssh version command) These are used to encrypt and decrypt the remote access connection (crypto key generate rsa command) By default, telnet is allowed on the VTYs you should ensure that only SSH access is allowed (login local and transport input Line Subconfiguration commands)
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RSA public and private keys Restricting VTY access
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1707The CD includes a multimedia demonstration of configuring SSH on an IOS device Here is an example configuration setting up SSH:
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IOS(config)# username richard secret mypassword IOS(config)# hostname alina alina(config)# ip domain-name dealcom alina(config)# ip ssh version 2 Please create RSA keys to enable SSH alina(config)# crypto key generate rsa The name for the keys will be: alinadealcom 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 How many bits in the modulus [512]: 1024 % Generating 1024 bit RSA keys, keys will be non-exportable[OK] *Oct 5 16:48:23455: %SSH-5-ENABLED: SSH 20 has been enabled alina(config)# line vty 0 15 alina(config-line)# login local alina(config-line)# transport input ssh alina(config-line)# exit
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Basic Troubleshooting
Notice in this example that when you execute the crypto key generate rsa command, you are prompted for the length of The transport input the RSA keys The longer the keys, the more command on a line restricts remote secure your connection will be, with 2048-bit access connectivity to the IOS based on keys being the strongest Choosing a higher the protocol/application you specify value, however, will take longer for the IOS device to generate On IOS devices shipped today, this shouldn t take that long: it took me about 30 seconds to generate 2048-bit keys on an 1841 router Another item to point out about this configuration is the two commands on the VTYs The login local command specifies the use of the local database (username command) for authentication: this causes the IOS device to prompt for both a username and password for authentication Without the local parameter, the IOS prompts only for a password, using the password command on the line to do the authentication (this process was discussed in 11) SSH requires the use of both usernames and passwords The transport input ssh command restricts access to the VTYs to SSH use only; by default, all forms of remote access, including telnet, are allowed If you will be using SSH to access your IOS device, you must use either a local username database, as described here, for your VTYs, or an authentication server (AAA) Also, I commonly use PuTTY as a console access program (instead of HyperTerminal), telnet client, and SSH client It s a great little program that does all these things, and it s free!
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Basic Troubleshooting
The remainder of this chapter focuses on troubleshooting tools that you can use on your routers and switches One of your first troubleshooting tasks is to figure out in which layer of the OSI Reference Model things are not working By narrowing down the problem to a specific layer, you ve greatly reduced the amount of time that you ll need in order to fix the problem or problems
17: IOS Device Management
TABLE 17-3
OSI Reference Model Layer
Layer 2 Layer 2 Layer 2 Layer 3 Layer 3 Layer 7 Layers 2 7
Command
show ip arp show interfaces (covered in 11) show cdp neighbors ping traceroute telnet debug
IOS Troubleshooting Commands
Remember at which layer of the OSI Reference Model the commands shown in Table 17-3 operate
Cisco offers a wide variety of tools that you can use Table 17-3 has a list of the more common IOS commands and what layer of the OSI Reference Model that they can be used for in troubleshooting The following sections cover most of these commands in more depth
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